Hello, mpv! 🎉

Model/Applications/InvidiousAPI.swift

@@ -466,7 +466,7 @@ final class InvidiousAPI: Service, ObservableObject, VideosAPI {
             return []
         }
 
-        let videoAssetsURLs = streams.filter { $0["type"].stringValue.starts(with: "video/mp4") && $0["encoding"].stringValue == "h264" }
+        let videoAssetsURLs = streams.filter { $0["type"].stringValue.starts(with: "video/") }
 
         return videoAssetsURLs.map {
             Stream(
@@ -474,7 +474,8 @@ final class InvidiousAPI: Service, ObservableObject, VideosAPI {
                 videoAsset: AVURLAsset(url: $0["url"].url!),
                 resolution: Stream.Resolution.from(resolution: $0["resolution"].stringValue),
                 kind: .adaptive,
-                encoding: $0["encoding"].stringValue
+                encoding: $0["encoding"].stringValue,
+                videoFormat: $0["type"].stringValue
             )
         }
     }

Model/Applications/PipedAPI.swift

@@ -481,11 +481,19 @@ final class PipedAPI: Service, ObservableObject, VideosAPI {
             streams.append(Stream(hlsURL: hlsURL))
         }
 
-        guard let audioStream = compatibleAudioStreams(from: content).first else {
+        let audioStreams = content
+            .dictionaryValue["audioStreams"]?
+            .arrayValue
+            .filter { $0.dictionaryValue["format"]?.stringValue == "M4A" }
+            .sorted {
+                $0.dictionaryValue["bitrate"]?.intValue ?? 0 > $1.dictionaryValue["bitrate"]?.intValue ?? 0
+            } ?? []
+
+        guard let audioStream = audioStreams.first else {
             return streams
         }
 
-        let videoStreams = compatibleVideoStream(from: content)
+        let videoStreams = content.dictionaryValue["videoStreams"]?.arrayValue ?? []
 
         videoStreams.forEach { videoStream in
             let audioAsset = AVURLAsset(url: audioStream.dictionaryValue["url"]!.url!)
@@ -493,10 +501,11 @@ final class PipedAPI: Service, ObservableObject, VideosAPI {
 
             let videoOnly = videoStream.dictionaryValue["videoOnly"]?.boolValue ?? true
             let resolution = Stream.Resolution.from(resolution: videoStream.dictionaryValue["quality"]!.stringValue)
+            let videoFormat = videoStream.dictionaryValue["format"]?.stringValue
 
             if videoOnly {
                 streams.append(
-                    Stream(audioAsset: audioAsset, videoAsset: videoAsset, resolution: resolution, kind: .adaptive)
+                    Stream(audioAsset: audioAsset, videoAsset: videoAsset, resolution: resolution, kind: .adaptive, videoFormat: videoFormat)
                 )
             } else {
                 streams.append(
@@ -515,23 +524,6 @@ final class PipedAPI: Service, ObservableObject, VideosAPI {
             .compactMap(extractVideo(from:)) ?? []
     }
 
-    private func compatibleAudioStreams(from content: JSON) -> [JSON] {
-        content
-            .dictionaryValue["audioStreams"]?
-            .arrayValue
-            .filter { $0.dictionaryValue["format"]?.stringValue == "M4A" }
-            .sorted {
-                $0.dictionaryValue["bitrate"]?.intValue ?? 0 > $1.dictionaryValue["bitrate"]?.intValue ?? 0
-            } ?? []
-    }
-
-    private func compatibleVideoStream(from content: JSON) -> [JSON] {
-        content
-            .dictionaryValue["videoStreams"]?
-            .arrayValue
-            .filter { $0.dictionaryValue["format"] == "MPEG_4" } ?? []
-    }
-
     private func extractComment(from content: JSON) -> Comment? {
         let details = content.dictionaryValue
         let author = details["author"]?.stringValue ?? ""

Model/HistoryModel.swift

@@ -23,13 +23,14 @@ extension PlayerModel {
     }
 
     func updateWatch(finished: Bool = false) {
-        guard let id = currentVideo?.videoID else {
+        guard let id = currentVideo?.videoID,
+              Defaults[.saveHistory]
+        else {
             return
         }
 
-        let time = player.currentTime()
-        let seconds = time.seconds
-        currentItem.playbackTime = time
+        let time = backend.currentTime
+        let seconds = time?.seconds ?? 0
 
         let watch: Watch!
         let watchFetchRequest = Watch.fetchRequest()

Model/Player/Backends/AVPlayerBackend.swift

@@ -0,0 +1,613 @@
+import AVFoundation
+import Defaults
+import Foundation
+import MediaPlayer
+import UIKit
+
+final class AVPlayerBackend: PlayerBackend {
+    static let assetKeysToLoad = ["tracks", "playable", "duration"]
+
+    var model: PlayerModel!
+    var controls: PlayerControlsModel!
+
+    var stream: Stream?
+    var video: Video?
+
+    var currentTime: CMTime? {
+        avPlayer.currentTime()
+    }
+
+    var loadedVideo: Bool {
+        !avPlayer.currentItem.isNil
+    }
+
+    var isLoadingVideo: Bool {
+        model.currentItem == nil || model.time == nil || !model.time!.isValid
+    }
+
+    var isPlaying: Bool {
+        avPlayer.timeControlStatus == .playing
+    }
+
+    var playerItemDuration: CMTime? {
+        avPlayer.currentItem?.asset.duration
+    }
+
+    private(set) var avPlayer = AVPlayer()
+    var controller: AppleAVPlayerViewController?
+
+    private var asset: AVURLAsset?
+    private var composition = AVMutableComposition()
+    private var loadedCompositionAssets = [AVMediaType]()
+
+    private var currentArtwork: MPMediaItemArtwork?
+    private var frequentTimeObserver: Any?
+    private var infrequentTimeObserver: Any?
+    private var playerTimeControlStatusObserver: Any?
+
+    private var statusObservation: NSKeyValueObservation?
+
+    private var timeObserverThrottle = Throttle(interval: 2)
+
+    init(model: PlayerModel, controls: PlayerControlsModel?) {
+        self.model = model
+        self.controls = controls
+
+        addFrequentTimeObserver()
+        addInfrequentTimeObserver()
+        addPlayerTimeControlStatusObserver()
+    }
+
+    func bestPlayable(_ streams: [Stream]) -> Stream? {
+        streams.first { $0.kind == .hls } ??
+            streams.filter { $0.kind == .adaptive }.max { $0.resolution < $1.resolution } ??
+            streams.first
+    }
+
+    func canPlay(_ stream: Stream) -> Bool {
+        stream.kind == .hls || stream.kind == .stream || stream.videoFormat == "MPEG_4" ||
+            (stream.videoFormat.starts(with: "video/mp4") && stream.encoding == "h264")
+    }
+
+    func playStream(
+        _ stream: Stream,
+        of video: Video,
+        preservingTime: Bool,
+        upgrading: Bool
+    ) {
+        if let url = stream.singleAssetURL {
+            model.logger.info("playing stream with one asset\(stream.kind == .hls ? " (HLS)" : ""): \(url)")
+            loadSingleAsset(url, stream: stream, of: video, preservingTime: preservingTime)
+        } else {
+            model.logger.info("playing stream with many assets:")
+            model.logger.info("composition audio asset: \(stream.audioAsset.url)")
+            model.logger.info("composition video asset: \(stream.videoAsset.url)")
+
+            loadComposition(stream, of: video, preservingTime: preservingTime)
+        }
+
+        if !upgrading {
+            updateCurrentArtwork()
+        }
+    }
+
+    func play() {
+        guard avPlayer.timeControlStatus != .playing else {
+            return
+        }
+
+        avPlayer.play()
+    }
+
+    func pause() {
+        guard avPlayer.timeControlStatus != .paused else {
+            return
+        }
+
+        avPlayer.pause()
+    }
+
+    func togglePlay() {
+        isPlaying ? pause() : play()
+    }
+
+    func stop() {
+        avPlayer.replaceCurrentItem(with: nil)
+    }
+
+    func seek(to time: CMTime, completionHandler: ((Bool) -> Void)?) {
+        avPlayer.seek(
+            to: time,
+            toleranceBefore: .secondsInDefaultTimescale(1),
+            toleranceAfter: .zero,
+            completionHandler: completionHandler ?? { _ in }
+        )
+    }
+
+    func seek(relative time: CMTime, completionHandler: ((Bool) -> Void)? = nil) {
+        if let currentTime = currentTime {
+            seek(to: currentTime + time, completionHandler: completionHandler)
+        }
+    }
+
+    func setRate(_ rate: Float) {
+        avPlayer.rate = rate
+    }
+
+    func closeItem() {
+        avPlayer.replaceCurrentItem(with: nil)
+    }
+
+    func enterFullScreen() {
+        controller?.playerView
+            .perform(NSSelectorFromString("enterFullScreenAnimated:completionHandler:"), with: false, with: nil)
+    }
+
+    func exitFullScreen() {
+        controller?.playerView
+            .perform(NSSelectorFromString("exitFullScreenAnimated:completionHandler:"), with: false, with: nil)
+    }
+
+    #if os(tvOS)
+        func closePiP(wasPlaying: Bool) {
+            let item = avPlayer.currentItem
+            let time = avPlayer.currentTime()
+
+            avPlayer.replaceCurrentItem(with: nil)
+
+            guard !item.isNil else {
+                return
+            }
+
+            avPlayer.seek(to: time)
+            avPlayer.replaceCurrentItem(with: item)
+
+            guard wasPlaying else {
+                return
+            }
+
+            DispatchQueue.main.asyncAfter(deadline: .now() + 1) { [weak self] in
+                self?.play()
+            }
+        }
+    #else
+        func closePiP(wasPlaying: Bool) {
+            controller?.playerView.player = nil
+            controller?.playerView.player = avPlayer
+
+            guard wasPlaying else {
+                return
+            }
+
+            DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
+                self?.play()
+            }
+        }
+    #endif
+
+    func updateControls() {}
+    func startControlsUpdates() {}
+    func stopControlsUpdates() {}
+    func setNeedsDrawing(_: Bool) {}
+
+    private func loadSingleAsset(
+        _ url: URL,
+        stream: Stream,
+        of video: Video,
+        preservingTime: Bool = false
+    ) {
+        asset?.cancelLoading()
+        asset = AVURLAsset(url: url)
+        asset?.loadValuesAsynchronously(forKeys: Self.assetKeysToLoad) { [weak self] in
+            var error: NSError?
+            switch self?.asset?.statusOfValue(forKey: "duration", error: &error) {
+            case .loaded:
+                DispatchQueue.main.async { [weak self] in
+                    self?.insertPlayerItem(stream, for: video, preservingTime: preservingTime)
+                }
+            case .failed:
+                DispatchQueue.main.async { [weak self] in
+                    self?.model.playerError = error
+                }
+            default:
+                return
+            }
+        }
+    }
+
+    private func loadComposition(
+        _ stream: Stream,
+        of video: Video,
+        preservingTime: Bool = false
+    ) {
+        loadedCompositionAssets = []
+        loadCompositionAsset(stream.audioAsset, stream: stream, type: .audio, of: video, preservingTime: preservingTime, model: model)
+        loadCompositionAsset(stream.videoAsset, stream: stream, type: .video, of: video, preservingTime: preservingTime, model: model)
+    }
+
+    private func loadCompositionAsset(
+        _ asset: AVURLAsset,
+        stream: Stream,
+        type: AVMediaType,
+        of video: Video,
+        preservingTime: Bool = false,
+        model: PlayerModel
+    ) {
+        asset.loadValuesAsynchronously(forKeys: Self.assetKeysToLoad) { [weak self] in
+            guard let self = self else {
+                return
+            }
+            model.logger.info("loading \(type.rawValue) track")
+
+            let assetTracks = asset.tracks(withMediaType: type)
+
+            guard let compositionTrack = self.composition.addMutableTrack(
+                withMediaType: type,
+                preferredTrackID: kCMPersistentTrackID_Invalid
+            ) else {
+                model.logger.critical("composition \(type.rawValue) addMutableTrack FAILED")
+                return
+            }
+
+            guard let assetTrack = assetTracks.first else {
+                model.logger.critical("asset \(type.rawValue) track FAILED")
+                return
+            }
+
+            try! compositionTrack.insertTimeRange(
+                CMTimeRange(start: .zero, duration: CMTime.secondsInDefaultTimescale(video.length)),
+                of: assetTrack,
+                at: .zero
+            )
+
+            model.logger.critical("\(type.rawValue) LOADED")
+
+            guard model.streamSelection == stream else {
+                model.logger.critical("IGNORING LOADED")
+                return
+            }
+
+            self.loadedCompositionAssets.append(type)
+
+            if self.loadedCompositionAssets.count == 2 {
+                self.insertPlayerItem(stream, for: video, preservingTime: preservingTime)
+            }
+        }
+    }
+
+    private func insertPlayerItem(
+        _ stream: Stream,
+        for video: Video,
+        preservingTime: Bool = false
+    ) {
+        removeItemDidPlayToEndTimeObserver()
+
+        model.playerItem = playerItem(stream)
+        guard model.playerItem != nil else {
+            return
+        }
+
+        addItemDidPlayToEndTimeObserver()
+        attachMetadata(to: model.playerItem!, video: video, for: stream)
+
+        DispatchQueue.main.async {
+            self.stream = stream
+            self.video = video
+            self.model.stream = stream
+            self.composition = AVMutableComposition()
+            self.asset = nil
+        }
+
+        let startPlaying = {
+            #if !os(macOS)
+                try? AVAudioSession.sharedInstance().setActive(true)
+            #endif
+
+            if self.isAutoplaying(self.model.playerItem!) {
+                DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) { [weak self] in
+                    guard let self = self else {
+                        return
+                    }
+
+                    if !preservingTime,
+                       let segment = self.model.sponsorBlock.segments.first,
+                       segment.start < 3,
+                       self.model.lastSkipped.isNil
+                    {
+                        self.avPlayer.seek(
+                            to: segment.endTime,
+                            toleranceBefore: .secondsInDefaultTimescale(1),
+                            toleranceAfter: .zero
+                        ) { finished in
+                            guard finished else {
+                                return
+                            }
+
+                            self.model.lastSkipped = segment
+                            self.model.play()
+                        }
+                    } else {
+                        self.model.play()
+                    }
+                }
+            }
+        }
+
+        let replaceItemAndSeek = {
+            guard video == self.model.currentVideo else {
+                return
+            }
+            self.avPlayer.replaceCurrentItem(with: self.model.playerItem)
+            self.seekToPreservedTime { finished in
+                guard finished else {
+                    return
+                }
+                self.model.preservedTime = nil
+
+                startPlaying()
+            }
+        }
+
+        if preservingTime {
+            if model.preservedTime.isNil {
+                model.saveTime {
+                    replaceItemAndSeek()
+                    startPlaying()
+                }
+            } else {
+                replaceItemAndSeek()
+                startPlaying()
+            }
+        } else {
+            avPlayer.replaceCurrentItem(with: model.playerItem)
+            startPlaying()
+        }
+    }
+
+    private func seekToPreservedTime(completionHandler: @escaping (Bool) -> Void = { _ in }) {
+        guard let time = model.preservedTime else {
+            return
+        }
+
+        avPlayer.seek(
+            to: time,
+            toleranceBefore: .secondsInDefaultTimescale(1),
+            toleranceAfter: .zero,
+            completionHandler: completionHandler
+        )
+    }
+
+    private func playerItem(_: Stream) -> AVPlayerItem? {
+        if let asset = asset {
+            return AVPlayerItem(asset: asset)
+        } else {
+            return AVPlayerItem(asset: composition)
+        }
+    }
+
+    private func attachMetadata(to item: AVPlayerItem, video: Video, for _: Stream? = nil) {
+        #if !os(macOS)
+            var externalMetadata = [
+                makeMetadataItem(.commonIdentifierTitle, value: video.title),
+                makeMetadataItem(.quickTimeMetadataGenre, value: video.genre ?? ""),
+                makeMetadataItem(.commonIdentifierDescription, value: video.description ?? "")
+            ]
+            if let thumbnailData = try? Data(contentsOf: video.thumbnailURL(quality: .medium)!),
+               let image = UIImage(data: thumbnailData),
+               let pngData = image.pngData()
+            {
+                let artworkItem = makeMetadataItem(.commonIdentifierArtwork, value: pngData)
+                externalMetadata.append(artworkItem)
+            }
+
+            item.externalMetadata = externalMetadata
+        #endif
+
+        item.preferredForwardBufferDuration = 5
+
+        observePlayerItemStatus(item)
+    }
+
+    #if !os(macOS)
+        private func makeMetadataItem(_ identifier: AVMetadataIdentifier, value: Any) -> AVMetadataItem {
+            let item = AVMutableMetadataItem()
+
+            item.identifier = identifier
+            item.value = value as? NSCopying & NSObjectProtocol
+            item.extendedLanguageTag = "und"
+
+            return item.copy() as! AVMetadataItem
+        }
+    #endif
+
+    func isAutoplaying(_ item: AVPlayerItem) -> Bool {
+        avPlayer.currentItem == item
+    }
+
+    private func observePlayerItemStatus(_ item: AVPlayerItem) {
+        statusObservation?.invalidate()
+        statusObservation = item.observe(\.status, options: [.old, .new]) { [weak self] playerItem, _ in
+            guard let self = self else {
+                return
+            }
+
+            switch playerItem.status {
+            case .readyToPlay:
+                if self.isAutoplaying(playerItem) {
+                    self.model.play()
+                }
+            case .failed:
+                self.model.playerError = item.error
+
+            default:
+                return
+            }
+        }
+    }
+
+    private func addItemDidPlayToEndTimeObserver() {
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(itemDidPlayToEndTime),
+            name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
+            object: playerItem
+        )
+    }
+
+    private func removeItemDidPlayToEndTimeObserver() {
+        NotificationCenter.default.removeObserver(
+            self,
+            name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
+            object: playerItem
+        )
+    }
+
+    @objc func itemDidPlayToEndTime() {
+        model.prepareCurrentItemForHistory(finished: true)
+
+        if model.queue.isEmpty {
+            #if !os(macOS)
+                try? AVAudioSession.sharedInstance().setActive(false)
+            #endif
+            model.resetQueue()
+            #if os(tvOS)
+                controller?.playerView.dismiss(animated: false) { [weak self] in
+                    self?.controller?.dismiss(animated: true)
+                }
+            #else
+                model.hide()
+            #endif
+        } else {
+            model.advanceToNextItem()
+        }
+    }
+
+    private func addFrequentTimeObserver() {
+        let interval = CMTime.secondsInDefaultTimescale(0.5)
+
+        frequentTimeObserver = avPlayer.addPeriodicTimeObserver(
+            forInterval: interval,
+            queue: .main
+        ) { [weak self] _ in
+            guard let self = self else {
+                return
+            }
+
+            guard !self.model.currentItem.isNil else {
+                return
+            }
+
+            self.controls.duration = self.playerItemDuration ?? .zero
+            self.controls.currentTime = self.currentTime ?? .zero
+
+            #if !os(tvOS)
+                self.updateNowPlayingInfo()
+            #endif
+
+            if let currentTime = self.currentTime {
+                self.model.handleSegments(at: currentTime)
+            }
+        }
+    }
+
+    private func addInfrequentTimeObserver() {
+        let interval = CMTime.secondsInDefaultTimescale(5)
+
+        infrequentTimeObserver = avPlayer.addPeriodicTimeObserver(
+            forInterval: interval,
+            queue: .main
+        ) { [weak self] _ in
+            guard let self = self else {
+                return
+            }
+
+            guard !self.model.currentItem.isNil else {
+                return
+            }
+
+            self.timeObserverThrottle.execute {
+                self.model.updateWatch()
+            }
+        }
+    }
+
+    private func addPlayerTimeControlStatusObserver() {
+        playerTimeControlStatusObserver = avPlayer.observe(\.timeControlStatus) { [weak self] player, _ in
+            guard let self = self,
+                  self.avPlayer == player
+            else {
+                return
+            }
+
+            DispatchQueue.main.async {
+                self.controls.isPlaying = player.timeControlStatus == .playing
+            }
+
+            if player.timeControlStatus != .waitingToPlayAtSpecifiedRate {
+                DispatchQueue.main.async { [weak self] in
+                    self?.model.objectWillChange.send()
+                }
+            }
+
+            if player.timeControlStatus == .playing, player.rate != self.model.currentRate {
+                player.rate = self.model.currentRate
+            }
+
+            #if os(macOS)
+                if player.timeControlStatus == .playing {
+                    ScreenSaverManager.shared.disable(reason: "Yattee is playing video")
+                } else {
+                    ScreenSaverManager.shared.enable()
+                }
+            #endif
+
+            self.timeObserverThrottle.execute {
+                self.model.updateWatch()
+            }
+        }
+    }
+
+    private func updateCurrentArtwork() {
+        guard let thumbnailData = try? Data(contentsOf: model.currentItem.video.thumbnailURL(quality: .medium)!) else {
+            return
+        }
+
+        #if os(macOS)
+            let image = NSImage(data: thumbnailData)
+        #else
+            let image = UIImage(data: thumbnailData)
+        #endif
+
+        if image.isNil {
+            return
+        }
+
+        currentArtwork = MPMediaItemArtwork(boundsSize: image!.size) { _ in image! }
+    }
+
+    fileprivate func updateNowPlayingInfo() {
+        var nowPlayingInfo: [String: AnyObject] = [
+            MPMediaItemPropertyTitle: model.currentItem.video.title as AnyObject,
+            MPMediaItemPropertyArtist: model.currentItem.video.author as AnyObject,
+            MPNowPlayingInfoPropertyIsLiveStream: model.currentItem.video.live as AnyObject,
+            MPNowPlayingInfoPropertyElapsedPlaybackTime: avPlayer.currentTime().seconds as AnyObject,
+            MPNowPlayingInfoPropertyPlaybackQueueCount: model.queue.count as AnyObject,
+            MPMediaItemPropertyMediaType: MPMediaType.anyVideo.rawValue as AnyObject
+        ]
+
+        if !currentArtwork.isNil {
+            nowPlayingInfo[MPMediaItemPropertyArtwork] = currentArtwork as AnyObject
+        }
+
+        if !model.currentItem.video.live {
+            let itemDuration = model.currentItem.videoDuration ?? model.currentItem.duration
+            let duration = itemDuration.isFinite ? Double(itemDuration) : nil
+
+            if !duration.isNil {
+                nowPlayingInfo[MPMediaItemPropertyPlaybackDuration] = duration as AnyObject
+            }
+        }
+
+        MPNowPlayingInfoCenter.default().nowPlayingInfo = nowPlayingInfo
+    }
+}

Model/Player/Backends/MPVBackend.swift

@@ -0,0 +1,305 @@
+import AVFAudio
+import CoreMedia
+import Foundation
+import Logging
+import SwiftUI
+
+final class MPVBackend: PlayerBackend {
+    private var logger = Logger(label: "mpv-backend")
+
+    var model: PlayerModel!
+    var controls: PlayerControlsModel!
+
+    var stream: Stream?
+    var video: Video?
+    var currentTime: CMTime?
+
+    var loadedVideo = false
+    var isLoadingVideo = true
+
+    var isPlaying = true { didSet {
+        if isPlaying {
+            startClientUpdates()
+        } else {
+            stopControlsUpdates()
+        }
+
+        updateControlsIsPlaying()
+    }}
+    var playerItemDuration: CMTime?
+
+    var controller: MPVViewController!
+    var client: MPVClient! { didSet { client.backend = self } }
+
+    private var clientTimer: RepeatingTimer!
+
+    private var onFileLoaded: (() -> Void)?
+
+    private var controlsUpdates = false
+    private var timeObserverThrottle = Throttle(interval: 2)
+
+    init(model: PlayerModel, controls: PlayerControlsModel? = nil) {
+        self.model = model
+        self.controls = controls
+
+        clientTimer = .init(timeInterval: 1)
+        clientTimer.eventHandler = getClientUpdates
+    }
+
+    func bestPlayable(_ streams: [Stream]) -> Stream? {
+        streams.filter { $0.kind == .adaptive }.max { $0.resolution < $1.resolution } ??
+            streams.first { $0.kind == .hls } ??
+            streams.first
+    }
+
+    func canPlay(_ stream: Stream) -> Bool {
+        stream.resolution != .unknown && stream.format != "AV1"
+    }
+
+    func playStream(_ stream: Stream, of video: Video, preservingTime: Bool, upgrading _: Bool) {
+        let updateCurrentStream = {
+            DispatchQueue.main.async { [weak self] in
+                self?.stream = stream
+                self?.video = video
+                self?.model.stream = stream
+            }
+        }
+
+        let startPlaying = {
+            #if !os(macOS)
+                try? AVAudioSession.sharedInstance().setActive(true)
+            #endif
+
+            DispatchQueue.main.async { [weak self] in
+                guard let self = self else {
+                    return
+                }
+
+                self.startClientUpdates()
+
+                if !preservingTime,
+                   let segment = self.model.sponsorBlock.segments.first,
+                   segment.start < 3,
+                   self.model.lastSkipped.isNil
+                {
+                    self.seek(to: segment.endTime) { finished in
+                        guard finished else {
+                            return
+                        }
+
+                        self.model.lastSkipped = segment
+                        self.play()
+                    }
+                } else {
+                    self.play()
+                }
+            }
+        }
+
+        let replaceItem: (CMTime?) -> Void = { [weak self] time in
+            guard let self = self else {
+                return
+            }
+
+            self.stop()
+
+            if let url = stream.singleAssetURL {
+                self.onFileLoaded = { [weak self] in
+                    self?.setIsLoadingVideo(false)
+                    updateCurrentStream()
+                    startPlaying()
+                }
+
+                self.client.loadFile(url, time: time) { [weak self] _ in
+                    self?.setIsLoadingVideo(true)
+                }
+            } else {
+                self.onFileLoaded = { [weak self] in
+                    self?.client.addAudio(stream.audioAsset.url) { _ in
+                        self?.setIsLoadingVideo(false)
+                        updateCurrentStream()
+                        startPlaying()
+                    }
+                }
+
+                self.client.loadFile(stream.videoAsset.url, time: time) { [weak self] _ in
+                    self?.setIsLoadingVideo(true)
+                    self?.pause()
+                }
+            }
+        }
+
+        if preservingTime {
+            if model.preservedTime.isNil {
+                model.saveTime {
+                    replaceItem(self.model.preservedTime)
+                }
+            } else {
+                replaceItem(self.model.preservedTime)
+            }
+        } else {
+            replaceItem(nil)
+        }
+    }
+
+    func play() {
+        isPlaying = true
+        startClientUpdates()
+
+        client?.play()
+    }
+
+    func pause() {
+        isPlaying = false
+        stopClientUpdates()
+
+        client?.pause()
+    }
+
+    func togglePlay() {
+        isPlaying ? pause() : play()
+    }
+
+    func stop() {
+        client?.stop()
+    }
+
+    func seek(to time: CMTime, completionHandler: ((Bool) -> Void)?) {
+        client.seek(to: time) { [weak self] _ in
+            self?.getClientUpdates()
+            self?.updateControls()
+            completionHandler?(true)
+        }
+    }
+
+    func seek(relative time: CMTime, completionHandler: ((Bool) -> Void)? = nil) {
+        client.seek(relative: time) { [weak self] _ in
+            self?.getClientUpdates()
+            self?.updateControls()
+            completionHandler?(true)
+        }
+    }
+
+    func setRate(_: Float) {
+        // TODO: Implement rate change
+    }
+
+    func closeItem() {}
+
+    func enterFullScreen() {}
+
+    func exitFullScreen() {}
+
+    func closePiP(wasPlaying _: Bool) {}
+
+    func updateControls() {
+        DispatchQueue.main.async { [weak self] in
+            self?.logger.info("updating controls")
+            self?.controls.currentTime = self?.currentTime ?? .zero
+            self?.controls.duration = self?.playerItemDuration ?? .zero
+        }
+    }
+
+    func startControlsUpdates() {
+        self.logger.info("starting controls updates")
+        controlsUpdates = true
+    }
+
+    func stopControlsUpdates() {
+        self.logger.info("stopping controls updates")
+        controlsUpdates = false
+    }
+
+    func startClientUpdates() {
+        clientTimer.resume()
+    }
+
+    private func getClientUpdates() {
+        self.logger.info("getting client updates")
+
+        currentTime = client?.currentTime
+        playerItemDuration = client?.duration
+
+        if controlsUpdates {
+            updateControls()
+        }
+
+        if let currentTime = currentTime {
+            model.handleSegments(at: currentTime)
+        }
+
+        self.timeObserverThrottle.execute {
+            self.model.updateWatch()
+        }
+    }
+
+    private func stopClientUpdates() {
+        clientTimer.suspend()
+    }
+
+    private func updateControlsIsPlaying() {
+        DispatchQueue.main.async { [weak self] in
+            self?.controls.isPlaying = self?.isPlaying ?? false
+        }
+    }
+
+    private func setIsLoadingVideo(_ value: Bool) {
+        isLoadingVideo = value
+        DispatchQueue.main.async { [weak self] in
+            self?.controls.isLoadingVideo = value
+        }
+    }
+
+    func handle(_ event: UnsafePointer<mpv_event>!) {
+        logger.info("\(String(cString: mpv_event_name(event.pointee.event_id)))")
+
+        switch event.pointee.event_id {
+        case MPV_EVENT_SHUTDOWN:
+            mpv_destroy(client.mpv)
+            client.mpv = nil
+
+        case MPV_EVENT_LOG_MESSAGE:
+            let logmsg = UnsafeMutablePointer<mpv_event_log_message>(OpaquePointer(event.pointee.data))
+            logger.info(.init(stringLiteral: "log: \(String(cString: (logmsg!.pointee.prefix)!)), "
+                    + "\(String(cString: (logmsg!.pointee.level)!)), "
+                    + "\(String(cString: (logmsg!.pointee.text)!))"))
+
+        case MPV_EVENT_FILE_LOADED:
+            onFileLoaded?()
+            onFileLoaded = nil
+
+        case MPV_EVENT_END_FILE:
+            break
+            // DispatchQueue.main.async { [weak self] in
+            // TODO: handle EOF
+            // self?.handleEndOfFile(event)
+            // }
+
+        default:
+            logger.info(.init(stringLiteral: "event: \(String(cString: mpv_event_name(event.pointee.event_id)))"))
+        }
+    }
+
+    func handleEndOfFile(_: UnsafePointer<mpv_event>!) {
+        guard !isLoadingVideo else {
+            return
+        }
+
+        model.prepareCurrentItemForHistory(finished: true)
+
+        if model.queue.isEmpty {
+            #if !os(macOS)
+                try? AVAudioSession.sharedInstance().setActive(false)
+            #endif
+            model.resetQueue()
+
+            model.hide()
+        } else {
+            model.advanceToNextItem()
+        }
+    }
+
+    func setNeedsDrawing(_ needsDrawing: Bool) {
+        client?.setNeedsDrawing(needsDrawing)
+    }
+}

Model/Player/Backends/MPVClient.swift

@@ -0,0 +1,229 @@
+import Foundation
+import Logging
+#if !os(macOS)
+    import CoreMedia
+    import Siesta
+    import UIKit
+#endif
+
+final class MPVClient: ObservableObject {
+    private var logger = Logger(label: "mpv-client")
+
+    var mpv: OpaquePointer!
+    var mpvGL: OpaquePointer!
+    var queue: DispatchQueue!
+    var glView: MPVOGLView!
+    var backend: MPVBackend!
+
+    func create(frame: CGRect) -> MPVOGLView {
+        glView = MPVOGLView(frame: frame)
+
+        mpv = mpv_create()
+        if mpv == nil {
+            print("failed creating context\n")
+            exit(1)
+        }
+
+        checkError(mpv_request_log_messages(mpv, "warn"))
+        checkError(mpv_initialize(mpv))
+        checkError(mpv_set_option_string(mpv, "vo", "libmpv"))
+        checkError(mpv_set_option_string(mpv, "hwdec", "yes"))
+
+        checkError(mpv_set_option_string(mpv, "override-display-fps", "\(UIScreen.main.maximumFramesPerSecond)"))
+        checkError(mpv_set_option_string(mpv, "video-sync", "display-resample"))
+
+        let api = UnsafeMutableRawPointer(mutating: (MPV_RENDER_API_TYPE_OPENGL as NSString).utf8String)
+        var initParams = mpv_opengl_init_params(
+            get_proc_address: getProcAddress(_:_:),
+            get_proc_address_ctx: nil,
+            extra_exts: nil
+        )
+
+        withUnsafeMutablePointer(to: &initParams) { initParams in
+            var params = [
+                mpv_render_param(type: MPV_RENDER_PARAM_API_TYPE, data: api),
+                mpv_render_param(type: MPV_RENDER_PARAM_OPENGL_INIT_PARAMS, data: initParams),
+                mpv_render_param()
+            ]
+
+            var mpvGL: OpaquePointer?
+
+            if mpv_render_context_create(&mpvGL, mpv, &params) < 0 {
+                puts("failed to initialize mpv GL context")
+                exit(1)
+            }
+
+            glView.mpvGL = UnsafeMutableRawPointer(mpvGL)
+
+            mpv_render_context_set_update_callback(
+                mpvGL,
+                glUpdate(_:),
+                UnsafeMutableRawPointer(Unmanaged.passUnretained(glView).toOpaque())
+            )
+        }
+
+        queue = DispatchQueue(label: "mpv", qos: .background)
+        queue!.async {
+            mpv_set_wakeup_callback(self.mpv, wakeUp, UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque()))
+        }
+
+        return glView
+    }
+
+    func readEvents() {
+        queue?.async { [self] in
+            while self.mpv != nil {
+                let event = mpv_wait_event(self.mpv, 0)
+                if event!.pointee.event_id == MPV_EVENT_NONE {
+                    break
+                }
+                backend.handle(event)
+            }
+        }
+    }
+
+    func loadFile(_ url: URL, time: CMTime? = nil, completionHandler: ((Int32) -> Void)? = nil) {
+        var args = [url.absoluteString]
+        if let time = time {
+            args.append("replace")
+            args.append("start=\(Int(time.seconds))")
+        }
+
+        command("loadfile", args: args, returnValueCallback: completionHandler)
+    }
+
+    func addAudio(_ url: URL, completionHandler: ((Int32) -> Void)? = nil) {
+        command("audio-add", args: [url.absoluteString], returnValueCallback: completionHandler)
+    }
+
+    func play() {
+        setFlagAsync("pause", false)
+    }
+
+    func pause() {
+        setFlagAsync("pause", true)
+    }
+
+    func togglePlay() {
+        command("cycle", args: ["pause"])
+    }
+
+    func stop() {
+        command("stop")
+    }
+
+    var currentTime: CMTime {
+        CMTime.secondsInDefaultTimescale(getDouble("time-pos"))
+    }
+
+    var duration: CMTime {
+        CMTime.secondsInDefaultTimescale(getDouble("duration"))
+    }
+
+    func seek(relative time: CMTime, completionHandler: ((Bool) -> Void)? = nil) {
+        command("seek", args: [String(time.seconds)]) { _ in
+            completionHandler?(true)
+        }
+    }
+
+    func seek(to time: CMTime, completionHandler: ((Bool) -> Void)? = nil) {
+        command("seek", args: [String(time.seconds), "absolute"]) { _ in
+            completionHandler?(true)
+        }
+    }
+
+    func setSize(_ width: Double, _ height: Double) {
+        logger.info("setting player size to \(width),\(height)")
+        #if !os(macOS)
+            guard width <= UIScreen.main.bounds.width, height <= UIScreen.main.bounds.height else {
+                logger.info("requested size is greater than screen size, ignoring")
+                return
+            }
+        #endif
+
+        glView?.frame = CGRect(x: 0, y: 0, width: width, height: height)
+    }
+
+    func setNeedsDrawing(_ needsDrawing: Bool) {
+        logger.info("needs drawing: \(needsDrawing)")
+        glView.needsDrawing = needsDrawing
+    }
+
+    func command(
+        _ command: String,
+        args: [String?] = [],
+        checkForErrors: Bool = true,
+        returnValueCallback: ((Int32) -> Void)? = nil
+    ) {
+        guard mpv != nil else {
+            return
+        }
+        var cargs = makeCArgs(command, args).map { $0.flatMap { UnsafePointer<CChar>(strdup($0)) } }
+        defer {
+            for ptr in cargs where ptr != nil {
+                free(UnsafeMutablePointer(mutating: ptr!))
+            }
+        }
+        logger.info("\(command) -- \(args)")
+        let returnValue = mpv_command(mpv, &cargs)
+        if checkForErrors {
+            checkError(returnValue)
+        }
+        if let cb = returnValueCallback {
+            cb(returnValue)
+        }
+    }
+
+    private func setFlagAsync(_ name: String, _ flag: Bool) {
+        var data: Int = flag ? 1 : 0
+        mpv_set_property_async(mpv, 0, name, MPV_FORMAT_FLAG, &data)
+    }
+
+    private func getDouble(_ name: String) -> Double {
+        var data = Double()
+        mpv_get_property(mpv, name, MPV_FORMAT_DOUBLE, &data)
+        return data
+    }
+
+    private func makeCArgs(_ command: String, _ args: [String?]) -> [String?] {
+        if !args.isEmpty, args.last == nil {
+            fatalError("Command do not need a nil suffix")
+        }
+
+        var strArgs = args
+        strArgs.insert(command, at: 0)
+        strArgs.append(nil)
+
+        return strArgs
+    }
+
+    func checkError(_ status: CInt) {
+        if status < 0 {
+            logger.error(.init(stringLiteral: "MPV API error: \(String(cString: mpv_error_string(status)))\n"))
+        }
+    }
+}
+
+private func getProcAddress(_: UnsafeMutableRawPointer?, _ name: UnsafePointer<Int8>?) -> UnsafeMutableRawPointer? {
+    let symbolName = CFStringCreateWithCString(kCFAllocatorDefault, name, CFStringBuiltInEncodings.ASCII.rawValue)
+    let addr = CFBundleGetFunctionPointerForName(CFBundleGetBundleWithIdentifier("com.apple.opengles" as CFString), symbolName)
+
+    return addr
+}
+
+private func glUpdate(_ ctx: UnsafeMutableRawPointer?) {
+    let glView = unsafeBitCast(ctx, to: MPVOGLView.self)
+
+    guard glView.needsDrawing else {
+        return
+    }
+
+    DispatchQueue.main.async {
+        glView.setNeedsDisplay()
+    }
+}
+
+private func wakeUp(_ context: UnsafeMutableRawPointer?) {
+    let client = unsafeBitCast(context, to: MPVClient.self)
+    client.readEvents()
+}

Model/Player/Backends/PlayerBackend.swift

@@ -0,0 +1,67 @@
+import CoreMedia
+import Defaults
+import Foundation
+
+protocol PlayerBackend {
+    var model: PlayerModel! { get set }
+    var controls: PlayerControlsModel! { get set }
+
+    var stream: Stream? { get set }
+    var video: Video? { get set }
+    var currentTime: CMTime? { get }
+
+    var loadedVideo: Bool { get }
+    var isLoadingVideo: Bool { get }
+
+    var isPlaying: Bool { get }
+    var playerItemDuration: CMTime? { get }
+
+    func bestPlayable(_ streams: [Stream]) -> Stream?
+    func canPlay(_ stream: Stream) -> Bool
+
+    func playStream(
+        _ stream: Stream,
+        of video: Video,
+        preservingTime: Bool,
+        upgrading: Bool
+    )
+
+    func play()
+    func pause()
+    func togglePlay()
+
+    func stop()
+
+    func seek(to time: CMTime, completionHandler: ((Bool) -> Void)?)
+    func seek(to seconds: Double, completionHandler: ((Bool) -> Void)?)
+    func seek(relative time: CMTime, completionHandler: ((Bool) -> Void)?)
+
+    func setRate(_ rate: Float)
+
+    func closeItem()
+
+    func enterFullScreen()
+    func exitFullScreen()
+
+    func closePiP(wasPlaying: Bool)
+
+    func updateControls()
+    func startControlsUpdates()
+    func stopControlsUpdates()
+
+    func setNeedsDrawing(_ needsDrawing: Bool)
+}
+
+extension PlayerBackend {
+    func seek(to time: CMTime, completionHandler: ((Bool) -> Void)? = nil) {
+        seek(to: time, completionHandler: completionHandler)
+    }
+
+    func seek(to seconds: Double, completionHandler: ((Bool) -> Void)? = nil) {
+        seek(to: .secondsInDefaultTimescale(seconds), completionHandler: completionHandler)
+    }
+
+    func seek(relative time: CMTime, completionHandler: ((Bool) -> Void)? = nil) {
+        seek(relative: time, completionHandler: completionHandler)
+    }
+}

Model/Player/Backends/PlayerBackendType.swift

@@ -0,0 +1,16 @@
+import Defaults
+import Foundation
+
+enum PlayerBackendType: String, CaseIterable, Defaults.Serializable {
+    case mpv
+    case appleAVPlayer
+
+    var label: String {
+        switch self {
+        case .mpv:
+            return "MPV"
+        case .appleAVPlayer:
+            return "AVPlayer"
+        }
+    }
+}

Model/Player/PlayerControlsModel.swift

@@ -0,0 +1,114 @@
+import CoreMedia
+import Foundation
+import SwiftUI
+
+final class PlayerControlsModel: ObservableObject {
+    @Published var isLoadingVideo = true
+    @Published var isPlaying = true
+    @Published var currentTime = CMTime.zero
+    @Published var duration = CMTime.zero
+    @Published var presentingControls = false { didSet { handlePresentationChange() } }
+    @Published var timer: Timer?
+    @Published var playingFullscreen = false
+
+    var player: PlayerModel!
+
+    var playbackTime: String {
+        guard let current = currentTime.seconds.formattedAsPlaybackTime(),
+              let duration = duration.seconds.formattedAsPlaybackTime()
+        else {
+            return "--:-- / --:--"
+        }
+
+        var withoutSegments = ""
+        if let withoutSegmentsDuration = playerItemDurationWithoutSponsorSegments,
+           self.duration.seconds != withoutSegmentsDuration
+        {
+            withoutSegments = " (\(withoutSegmentsDuration.formattedAsPlaybackTime() ?? "--:--"))"
+        }
+
+        return "\(current) / \(duration)\(withoutSegments)"
+    }
+
+    var playerItemDurationWithoutSponsorSegments: Double? {
+        guard let duration = player.playerItemDurationWithoutSponsorSegments else {
+            return nil
+        }
+
+        return duration.seconds
+    }
+
+    func handlePresentationChange() {
+        if presentingControls {
+            DispatchQueue.main.async { [weak self] in
+                self?.player.backend.startControlsUpdates()
+                self?.resetTimer()
+            }
+        } else {
+            player.backend.stopControlsUpdates()
+            timer?.invalidate()
+            timer = nil
+        }
+    }
+
+    func show() {
+        withAnimation(PlayerControls.animation) {
+            player.backend.updateControls()
+            presentingControls = true
+        }
+    }
+
+    func hide() {
+        withAnimation(PlayerControls.animation) {
+            presentingControls = false
+        }
+    }
+
+    func toggle() {
+        withAnimation(PlayerControls.animation) {
+            if !presentingControls {
+                player.backend.updateControls()
+            }
+
+            presentingControls.toggle()
+        }
+    }
+
+    func toggleFullscreen(_ value: Bool) {
+        withAnimation(Animation.easeOut) {
+            resetTimer()
+            withAnimation(PlayerControls.animation) {
+                playingFullscreen = !value
+            }
+
+            if playingFullscreen {
+                guard !(UIApplication.shared.windows.first?.windowScene?.interfaceOrientation.isLandscape ?? true) else {
+                    return
+                }
+                Orientation.lockOrientation(.landscape, andRotateTo: .landscapeRight)
+            } else {
+                Orientation.lockOrientation(.allButUpsideDown, andRotateTo: .portrait)
+            }
+        }
+    }
+
+    func reset() {
+        currentTime = .zero
+        duration = .zero
+    }
+
+    func resetTimer() {
+        removeTimer()
+        timer = Timer.scheduledTimer(withTimeInterval: 5.0, repeats: false) { _ in
+            withAnimation(PlayerControls.animation) { [weak self] in
+                self?.presentingControls = false
+                self?.player.backend.stopControlsUpdates()
+            }
+        }
+    }
+
+    func removeTimer() {
+        timer?.invalidate()
+        timer = nil
+    }
+}

Model/Player/PlayerModel.swift

@@ -16,18 +16,35 @@ import SwiftyJSON
 
 final class PlayerModel: ObservableObject {
     static let availableRates: [Float] = [0.5, 0.67, 0.8, 1, 1.25, 1.5, 2]
-    static let assetKeysToLoad = ["tracks", "playable", "duration"]
     let logger = Logger(label: "stream.yattee.app")
 
-    private(set) var player = AVPlayer()
-    var playerView = Player()
-    var controller: PlayerViewController?
+    var avPlayerView = AVPlayerView()
     var playerItem: AVPlayerItem?
 
-    @Published var presentingPlayer = false { didSet { handlePresentationChange() } }
+    var mpvPlayerView = MPVPlayerView()
 
+    @Published var presentingPlayer = false { didSet { handlePresentationChange() } }
+    @Published var activeBackend = PlayerBackendType.mpv
+
+    var avPlayerBackend: AVPlayerBackend!
+    var mpvBackend: MPVBackend!
+
+    var backends: [PlayerBackend] {
+        [avPlayerBackend, mpvBackend]
+    }
+
+    var backend: PlayerBackend! {
+        switch activeBackend {
+        case .mpv:
+            return mpvBackend
+        case .appleAVPlayer:
+            return avPlayerBackend
+        }
+    }
+
+    @Published var playerSize: CGSize = .zero
     @Published var stream: Stream?
-    @Published var currentRate: Float = 1.0 { didSet { player.rate = currentRate } }
+    @Published var currentRate: Float = 1.0 { didSet { backend.setRate(currentRate) } }
 
     @Published var availableStreams = [Stream]() { didSet { handleAvailableStreamsChange() } }
     @Published var streamSelection: Stream? { didSet { rebuildTVMenu() } }
@@ -53,24 +70,15 @@ final class PlayerModel: ObservableObject {
 
     var accounts: AccountsModel
     var comments: CommentsModel
-
-    var asset: AVURLAsset?
-    var composition = AVMutableComposition()
-    var loadedCompositionAssets = [AVMediaType]()
-
+    var controls: PlayerControlsModel { didSet {
+        backends.forEach { backend in
+            var backend = backend
+            backend.controls = controls
+        }
+    }}
     var context: NSManagedObjectContext = PersistenceController.shared.container.viewContext
 
-    private var currentArtwork: MPMediaItemArtwork?
-    private var frequentTimeObserver: Any?
-    private var infrequentTimeObserver: Any?
-    private var playerTimeControlStatusObserver: Any?
-
-    private var statusObservation: NSKeyValueObservation?
-
-    private var timeObserverThrottle = Throttle(interval: 2)
-
-    var playingInPictureInPicture = false
-    var playingFullscreen = false
+    @Published var playingInPictureInPicture = false
 
     @Published var presentingErrorDetails = false
     var playerError: Error? { didSet {
@@ -89,13 +97,15 @@ final class PlayerModel: ObservableObject {
         @Default(.closePiPAndOpenPlayerOnEnteringForeground) var closePiPAndOpenPlayerOnEnteringForeground
     #endif
 
-    init(accounts: AccountsModel? = nil, comments: CommentsModel? = nil) {
+    init(accounts: AccountsModel? = nil, comments: CommentsModel? = nil, controls: PlayerControlsModel? = nil) {
         self.accounts = accounts ?? AccountsModel()
         self.comments = comments ?? CommentsModel()
+        self.controls = controls ?? PlayerControlsModel()
 
-        addFrequentTimeObserver()
-        addInfrequentTimeObserver()
-        addPlayerTimeControlStatusObserver()
+        self.avPlayerBackend = AVPlayerBackend(model: self, controls: controls)
+        self.mpvBackend = MPVBackend(model: self)
+
+        self.activeBackend = Defaults[.activeBackend]
     }
 
     func show() {
@@ -137,11 +147,25 @@ final class PlayerModel: ObservableObject {
             return false
         }
 
-        return player.currentItem == nil || time == nil || !time!.isValid
+        return backend.isLoadingVideo
     }
 
     var isPlaying: Bool {
-        player.timeControlStatus == .playing
+        backend.isPlaying
+    }
+
+    var playerItemDuration: CMTime? {
+        backend.playerItemDuration
+    }
+
+    var playerItemDurationWithoutSponsorSegments: CMTime? {
+        (backend.playerItemDuration ?? .zero) - .secondsInDefaultTimescale(
+            sponsorBlock.segments.reduce(0) { $0 + $1.duration }
+        )
+    }
+
+    var videoDuration: TimeInterval? {
+        currentItem?.duration ?? currentVideo?.length ?? playerItemDuration?.seconds
     }
 
     var time: CMTime? {
@@ -152,32 +176,16 @@ final class PlayerModel: ObservableObject {
         currentVideo?.live ?? false
     }
 
-    var playerItemDuration: CMTime? {
-        player.currentItem?.asset.duration
-    }
-
-    var videoDuration: TimeInterval? {
-        currentItem?.duration ?? currentVideo?.length ?? player.currentItem?.asset.duration.seconds
-    }
-
     func togglePlay() {
-        isPlaying ? pause() : play()
+        backend.togglePlay()
     }
 
     func play() {
-        guard player.timeControlStatus != .playing else {
-            return
-        }
-
-        player.play()
+        backend.play()
     }
 
     func pause() {
-        guard player.timeControlStatus != .paused else {
-            return
-        }
-
-        player.pause()
+        backend.pause()
     }
 
     func play(_ video: Video, at time: TimeInterval? = nil, inNavigationView: Bool = false) {
@@ -208,28 +216,37 @@ final class PlayerModel: ObservableObject {
                 self?.sponsorBlock.loadSegments(
                     videoID: video.videoID,
                     categories: Defaults[.sponsorBlockCategories]
-                )
+                ) {
+                    if Defaults[.showChannelSubscribers] {
+                        self?.loadCurrentItemChannelDetails()
+                    }
+                }
             }
         }
 
-        if let url = stream.singleAssetURL {
-            logger.info("playing stream with one asset\(stream.kind == .hls ? " (HLS)" : ""): \(url)")
-            loadSingleAsset(url, stream: stream, of: video, preservingTime: preservingTime)
-        } else {
-            logger.info("playing stream with many assets:")
-            logger.info("composition audio asset: \(stream.audioAsset.url)")
-            logger.info("composition video asset: \(stream.videoAsset.url)")
+        controls.reset()
 
-            loadComposition(stream, of: video, preservingTime: preservingTime)
+        backend.playStream(
+            stream,
+            of: video,
+            preservingTime: preservingTime,
+            upgrading: upgrading
+        )
+    }
+
+    func saveTime(completionHandler: @escaping () -> Void = {}) {
+        guard let currentTime = backend.currentTime, currentTime.seconds > 0 else {
+            return
         }
 
-        if !upgrading {
-            updateCurrentArtwork()
+        DispatchQueue.main.async { [weak self] in
+            self?.preservedTime = currentTime
+            completionHandler()
         }
     }
 
-    func upgradeToStream(_ stream: Stream) {
-        if !self.stream.isNil, self.stream != stream {
+    func upgradeToStream(_ stream: Stream, force: Bool = false) {
+        if !self.stream.isNil, force || self.stream != stream {
             playStream(stream, of: currentVideo!, preservingTime: true, upgrading: true)
         }
     }
@@ -254,6 +271,9 @@ final class PlayerModel: ObservableObject {
     }
 
     private func handlePresentationChange() {
+        backend.setNeedsDrawing(presentingPlayer)
+        controls.hide()
+
         if presentingPlayer, closePiPOnOpeningPlayer, playingInPictureInPicture {
             DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
                 self?.closePiP()
@@ -266,7 +286,7 @@ final class PlayerModel: ObservableObject {
             }
         }
 
-        if !presentingPlayer, !pauseOnHidingPlayer, isPlaying {
+        if !presentingPlayer, !pauseOnHidingPlayer, backend.isPlaying {
             DispatchQueue.main.asyncAfter(deadline: .now() + 1) { [weak self] in
                 self?.play()
             }
@@ -281,423 +301,49 @@ final class PlayerModel: ObservableObject {
         }
     }
 
-    private func insertPlayerItem(
-        _ stream: Stream,
-        for video: Video,
-        preservingTime: Bool = false
-    ) {
-        removeItemDidPlayToEndTimeObserver()
+    func changeActiveBackend(from: PlayerBackendType, to: PlayerBackendType) {
+        Defaults[.activeBackend] = to
+        self.activeBackend = to
 
-        playerItem = playerItem(stream)
-        guard playerItem != nil else {
+        guard var stream = stream else {
             return
         }
 
-        addItemDidPlayToEndTimeObserver()
-        attachMetadata(to: playerItem!, video: video, for: stream)
+        inactiveBackends().forEach { $0.pause() }
 
-        DispatchQueue.main.async { [weak self] in
-            guard let self = self else {
-                return
-            }
+        let fromBackend: PlayerBackend = from == .appleAVPlayer ? avPlayerBackend : mpvBackend
+        let toBackend: PlayerBackend = to == .appleAVPlayer ? avPlayerBackend : mpvBackend
 
-            self.stream = stream
-            self.composition = AVMutableComposition()
-            self.asset = nil
-        }
-
-        let startPlaying = {
-            #if !os(macOS)
-                try? AVAudioSession.sharedInstance().setActive(true)
-            #endif
-
-            if self.isAutoplaying(self.playerItem!) {
-                DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) { [weak self] in
-                    guard let self = self else {
-                        return
-                    }
-
-                    if !preservingTime,
-                       let segment = self.sponsorBlock.segments.first,
-                       segment.start < 3,
-                       self.lastSkipped.isNil
-                    {
-                        self.player.seek(
-                            to: segment.endTime,
-                            toleranceBefore: .secondsInDefaultTimescale(1),
-                            toleranceAfter: .zero
-                        ) { finished in
-                            guard finished else {
-                                return
-                            }
-
-                            self.lastSkipped = segment
-                            self.play()
-                        }
-                    } else {
-                        self.play()
-                    }
-                }
-            }
-        }
-
-        let replaceItemAndSeek = {
-            guard video == self.currentVideo else {
-                return
-            }
-            self.player.replaceCurrentItem(with: self.playerItem)
-            self.seekToPreservedTime { finished in
+        if let stream = toBackend.stream, toBackend.video == fromBackend.video {
+            toBackend.seek(to: fromBackend.currentTime?.seconds ?? .zero) { finished in
                 guard finished else {
                     return
                 }
-                self.preservedTime = nil
-
-                startPlaying()
-            }
-        }
-
-        if preservingTime {
-            if preservedTime.isNil {
-                saveTime {
-                    replaceItemAndSeek()
-                    startPlaying()
-                }
-            } else {
-                replaceItemAndSeek()
-                startPlaying()
-            }
-        } else {
-            player.replaceCurrentItem(with: playerItem)
-            startPlaying()
-        }
-    }
-
-    private func loadSingleAsset(
-        _ url: URL,
-        stream: Stream,
-        of video: Video,
-        preservingTime: Bool = false
-    ) {
-        asset?.cancelLoading()
-        asset = AVURLAsset(url: url)
-        asset?.loadValuesAsynchronously(forKeys: Self.assetKeysToLoad) { [weak self] in
-            var error: NSError?
-
-            switch self?.asset?.statusOfValue(forKey: "duration", error: &error) {
-            case .loaded:
-                DispatchQueue.main.async { [weak self] in
-                    self?.insertPlayerItem(stream, for: video, preservingTime: preservingTime)
-                }
-            case .failed:
-                DispatchQueue.main.async { [weak self] in
-                    self?.playerError = error
-                }
-            default:
-                return
-            }
-        }
-    }
-
-    private func loadComposition(
-        _ stream: Stream,
-        of video: Video,
-        preservingTime: Bool = false
-    ) {
-        loadedCompositionAssets = []
-        loadCompositionAsset(stream.audioAsset, stream: stream, type: .audio, of: video, preservingTime: preservingTime)
-        loadCompositionAsset(stream.videoAsset, stream: stream, type: .video, of: video, preservingTime: preservingTime)
-    }
-
-    private func loadCompositionAsset(
-        _ asset: AVURLAsset,
-        stream: Stream,
-        type: AVMediaType,
-        of video: Video,
-        preservingTime: Bool = false
-    ) {
-        asset.loadValuesAsynchronously(forKeys: Self.assetKeysToLoad) { [weak self] in
-            guard let self = self else {
-                return
-            }
-            self.logger.info("loading \(type.rawValue) track")
-
-            let assetTracks = asset.tracks(withMediaType: type)
-
-            guard let compositionTrack = self.composition.addMutableTrack(
-                withMediaType: type,
-                preferredTrackID: kCMPersistentTrackID_Invalid
-            ) else {
-                self.logger.critical("composition \(type.rawValue) addMutableTrack FAILED")
-                return
+                toBackend.play()
             }
 
-            guard let assetTrack = assetTracks.first else {
-                self.logger.critical("asset \(type.rawValue) track FAILED")
-                return
-            }
+            self.stream = stream
+            streamSelection = stream
 
-            try! compositionTrack.insertTimeRange(
-                CMTimeRange(start: .zero, duration: CMTime.secondsInDefaultTimescale(video.length)),
-                of: assetTrack,
-                at: .zero
-            )
-
-            self.logger.critical("\(type.rawValue) LOADED")
-
-            guard self.streamSelection == stream else {
-                self.logger.critical("IGNORING LOADED")
-                return
-            }
-
-            self.loadedCompositionAssets.append(type)
-
-            if self.loadedCompositionAssets.count == 2 {
-                self.insertPlayerItem(stream, for: video, preservingTime: preservingTime)
-            }
-        }
-    }
-
-    private func playerItem(_: Stream) -> AVPlayerItem? {
-        if let asset = asset {
-            return AVPlayerItem(asset: asset)
-        } else {
-            return AVPlayerItem(asset: composition)
-        }
-    }
-
-    private func attachMetadata(to item: AVPlayerItem, video: Video, for _: Stream? = nil) {
-        #if !os(macOS)
-            var externalMetadata = [
-                makeMetadataItem(.commonIdentifierTitle, value: video.title),
-                makeMetadataItem(.quickTimeMetadataGenre, value: video.genre ?? ""),
-                makeMetadataItem(.commonIdentifierDescription, value: video.description ?? "")
-            ]
-            if let thumbnailData = try? Data(contentsOf: video.thumbnailURL(quality: .medium)!),
-               let image = UIImage(data: thumbnailData),
-               let pngData = image.pngData()
-            {
-                let artworkItem = makeMetadataItem(.commonIdentifierArtwork, value: pngData)
-                externalMetadata.append(artworkItem)
-            }
-
-            item.externalMetadata = externalMetadata
-        #endif
-
-        item.preferredForwardBufferDuration = 5
-
-        observePlayerItemStatus(item)
-    }
-
-    private func observePlayerItemStatus(_ item: AVPlayerItem) {
-        statusObservation?.invalidate()
-        statusObservation = item.observe(\.status, options: [.old, .new]) { [weak self] playerItem, _ in
-            guard let self = self else {
-                return
-            }
-
-            switch playerItem.status {
-            case .readyToPlay:
-                if self.isAutoplaying(playerItem) {
-                    self.play()
-                }
-            case .failed:
-                self.playerError = item.error
-
-            default:
-                return
-            }
-        }
-    }
-
-    #if !os(macOS)
-        private func makeMetadataItem(_ identifier: AVMetadataIdentifier, value: Any) -> AVMetadataItem {
-            let item = AVMutableMetadataItem()
-
-            item.identifier = identifier
-            item.value = value as? NSCopying & NSObjectProtocol
-            item.extendedLanguageTag = "und"
-
-            return item.copy() as! AVMetadataItem
-        }
-    #endif
-
-    private func addItemDidPlayToEndTimeObserver() {
-        NotificationCenter.default.addObserver(
-            self,
-            selector: #selector(itemDidPlayToEndTime),
-            name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
-            object: playerItem
-        )
-    }
-
-    private func removeItemDidPlayToEndTimeObserver() {
-        NotificationCenter.default.removeObserver(
-            self,
-            name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
-            object: playerItem
-        )
-    }
-
-    @objc func itemDidPlayToEndTime() {
-        prepareCurrentItemForHistory(finished: true)
-
-        if queue.isEmpty {
-            #if !os(macOS)
-                try? AVAudioSession.sharedInstance().setActive(false)
-            #endif
-            resetQueue()
-            #if os(tvOS)
-                controller?.playerView.dismiss(animated: false) { [weak self] in
-                    self?.controller?.dismiss(animated: true)
-                }
-            #endif
-        } else {
-            advanceToNextItem()
-        }
-    }
-
-    private func saveTime(completionHandler: @escaping () -> Void = {}) {
-        let currentTime = player.currentTime()
-
-        guard currentTime.seconds > 0 else {
             return
         }
 
-        DispatchQueue.main.async { [weak self] in
-            self?.preservedTime = currentTime
-            completionHandler()
-        }
-    }
-
-    private func seekToPreservedTime(completionHandler: @escaping (Bool) -> Void = { _ in }) {
-        guard let time = preservedTime else {
-            return
-        }
-
-        player.seek(
-            to: time,
-            toleranceBefore: .secondsInDefaultTimescale(1),
-            toleranceAfter: .zero,
-            completionHandler: completionHandler
-        )
-    }
-
-    private func addFrequentTimeObserver() {
-        let interval = CMTime.secondsInDefaultTimescale(0.5)
-
-        frequentTimeObserver = player.addPeriodicTimeObserver(
-            forInterval: interval,
-            queue: .main
-        ) { [weak self] _ in
-            guard let self = self else {
+        if !backend.canPlay(stream) {
+            guard let preferredStream = preferredStream(availableStreams) else {
                 return
             }
 
-            guard !self.currentItem.isNil else {
-                return
-            }
+            stream = preferredStream
+            streamSelection = preferredStream
+        }
 
-            #if !os(tvOS)
-                self.updateNowPlayingInfo()
-            #endif
-
-            self.handleSegments(at: self.player.currentTime())
+        DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
+            self?.upgradeToStream(stream, force: true)
         }
     }
 
-    private func addInfrequentTimeObserver() {
-        let interval = CMTime.secondsInDefaultTimescale(5)
-
-        infrequentTimeObserver = player.addPeriodicTimeObserver(
-            forInterval: interval,
-            queue: .main
-        ) { [weak self] _ in
-            guard let self = self else {
-                return
-            }
-
-            guard !self.currentItem.isNil else {
-                return
-            }
-
-            self.timeObserverThrottle.execute {
-                self.updateWatch()
-            }
-        }
-    }
-
-    private func addPlayerTimeControlStatusObserver() {
-        playerTimeControlStatusObserver = player.observe(\.timeControlStatus) { [weak self] player, _ in
-            guard let self = self,
-                  self.player == player
-            else {
-                return
-            }
-
-            if player.timeControlStatus != .waitingToPlayAtSpecifiedRate {
-                self.objectWillChange.send()
-            }
-
-            if player.timeControlStatus == .playing, player.rate != self.currentRate {
-                player.rate = self.currentRate
-            }
-
-            #if os(macOS)
-                if player.timeControlStatus == .playing {
-                    ScreenSaverManager.shared.disable(reason: "Yattee is playing video")
-                } else {
-                    ScreenSaverManager.shared.enable()
-                }
-            #endif
-
-            self.timeObserverThrottle.execute {
-                self.updateWatch()
-            }
-        }
-    }
-
-    fileprivate func updateNowPlayingInfo() {
-        var nowPlayingInfo: [String: AnyObject] = [
-            MPMediaItemPropertyTitle: currentItem.video.title as AnyObject,
-            MPMediaItemPropertyArtist: currentItem.video.author as AnyObject,
-            MPNowPlayingInfoPropertyIsLiveStream: currentItem.video.live as AnyObject,
-            MPNowPlayingInfoPropertyElapsedPlaybackTime: player.currentTime().seconds as AnyObject,
-            MPNowPlayingInfoPropertyPlaybackQueueCount: queue.count as AnyObject,
-            MPMediaItemPropertyMediaType: MPMediaType.anyVideo.rawValue as AnyObject
-        ]
-
-        if !currentArtwork.isNil {
-            nowPlayingInfo[MPMediaItemPropertyArtwork] = currentArtwork as AnyObject
-        }
-
-        if !currentItem.video.live {
-            let itemDuration = currentItem.videoDuration ?? currentItem.duration
-            let duration = itemDuration.isFinite ? Double(itemDuration) : nil
-
-            if !duration.isNil {
-                nowPlayingInfo[MPMediaItemPropertyPlaybackDuration] = duration as AnyObject
-            }
-        }
-
-        MPNowPlayingInfoCenter.default().nowPlayingInfo = nowPlayingInfo
-    }
-
-    private func updateCurrentArtwork() {
-        guard let thumbnailData = try? Data(contentsOf: currentItem.video.thumbnailURL(quality: .medium)!) else {
-            return
-        }
-
-        #if os(macOS)
-            let image = NSImage(data: thumbnailData)
-        #else
-            let image = UIImage(data: thumbnailData)
-        #endif
-
-        if image.isNil {
-            return
-        }
-
-        currentArtwork = MPMediaItemArtwork(boundsSize: image!.size) { _ in image! }
+    private func inactiveBackends() -> [PlayerBackend] {
+        [activeBackend == PlayerBackendType.mpv ? avPlayerBackend : mpvBackend]
     }
 
     func rateLabel(_ rate: Float) -> String {
@@ -711,7 +357,8 @@ final class PlayerModel: ObservableObject {
     func closeCurrentItem() {
         prepareCurrentItemForHistory()
         currentItem = nil
-        player.replaceCurrentItem(with: nil)
+
+        backend.closeItem()
     }
 
     func closePiP() {
@@ -726,46 +373,9 @@ final class PlayerModel: ObservableObject {
             show()
         #endif
 
-        doClosePiP(wasPlaying: wasPlaying)
+        backend.closePiP(wasPlaying: wasPlaying)
     }
 
-    #if os(tvOS)
-        private func doClosePiP(wasPlaying: Bool) {
-            let item = player.currentItem
-            let time = player.currentTime()
-
-            self.player.replaceCurrentItem(with: nil)
-
-            guard !item.isNil else {
-                return
-            }
-
-            self.player.seek(to: time)
-            self.player.replaceCurrentItem(with: item)
-
-            guard wasPlaying else {
-                return
-            }
-
-            DispatchQueue.main.asyncAfter(deadline: .now() + 1) { [weak self] in
-                self?.play()
-            }
-        }
-    #else
-        private func doClosePiP(wasPlaying: Bool) {
-            controller?.playerView.player = nil
-            controller?.playerView.player = player
-
-            guard wasPlaying else {
-                return
-            }
-
-            DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
-                self?.play()
-            }
-        }
-    #endif
-
     func handleCurrentItemChange() {
         #if os(macOS)
             Windows.player.window?.title = windowTitle
@@ -789,25 +399,23 @@ final class PlayerModel: ObservableObject {
         }
 
         func enterFullScreen() {
-            guard !playingFullscreen else {
+            guard !controls.playingFullscreen else {
                 return
             }
 
             logger.info("entering fullscreen")
 
-            controller?.playerView
-                .perform(NSSelectorFromString("enterFullScreenAnimated:completionHandler:"), with: false, with: nil)
+            backend.enterFullScreen()
         }
 
         func exitFullScreen() {
-            guard playingFullscreen else {
+            guard controls.playingFullscreen else {
                 return
             }
 
             logger.info("exiting fullscreen")
 
-            controller?.playerView
-                .perform(NSSelectorFromString("exitFullScreenAnimated:completionHandler:"), with: false, with: nil)
+            backend.exitFullScreen()
         }
     #endif
 }

Model/Player/PlayerQueue.swift

@@ -56,7 +56,7 @@ extension PlayerModel {
 
     func playItem(_ item: PlayerQueueItem, video: Video? = nil, at time: TimeInterval? = nil) {
         if !playingInPictureInPicture {
-            player.replaceCurrentItem(with: nil)
+            backend.closeItem()
         }
 
         comments.reset()
@@ -92,13 +92,13 @@ extension PlayerModel {
             streams = streams.filter { $0.instance.id == id }
         }
 
+        streams = streams.filter { backend.canPlay($0) }
+
         switch quality {
         case .best:
-            return streams.first { $0.kind == .hls } ??
-                streams.filter { $0.kind == .stream }.max { $0.resolution < $1.resolution } ??
-                streams.first
+            return backend.bestPlayable(streams)
         default:
-            let sorted = streams.filter { $0.kind != .hls }.sorted { $0.resolution > $1.resolution }
+            let sorted = streams.filter { $0.kind != .hls }.sorted { $0.resolution > $1.resolution }.sorted { $0.kind < $1.kind }
             return sorted.first(where: { $0.resolution.height <= quality.value.height })
         }
     }
@@ -117,7 +117,7 @@ extension PlayerModel {
         remove(newItem)
 
         currentItem = newItem
-        player.pause()
+        pause()
 
         accounts.api.loadDetails(newItem) { newItem in
             self.playItem(newItem, video: newItem.video, at: time)
@@ -143,11 +143,7 @@ extension PlayerModel {
             self.removeQueueItems()
         }
 
-        player.replaceCurrentItem(with: nil)
-    }
-
-    func isAutoplaying(_ item: AVPlayerItem) -> Bool {
-        player.currentItem == item
+        backend.closeItem()
     }
 
     @discardableResult func enqueueVideo(
@@ -162,7 +158,7 @@ extension PlayerModel {
         if play {
             currentItem = item
             // pause playing current video as it's going to be replaced with next one
-            player.pause()
+            pause()
         }
 
         queue.insert(item, at: prepending ? 0 : queue.endIndex)

Model/Player/PlayerSponsorBlock.swift

@@ -38,9 +38,12 @@ extension PlayerModel {
             return
         }
 
-        player.seek(to: segment.endTime)
-        lastSkipped = segment
-        segmentRestorationTime = time
+        backend.seek(to: segment.endTime)
+
+        DispatchQueue.main.async { [weak self] in
+            self?.lastSkipped = segment
+            self?.segmentRestorationTime = time
+        }
         logger.info("SponsorBlock skipping to: \(segment.end)")
     }
 
@@ -63,13 +66,15 @@ extension PlayerModel {
         }
 
         restoredSegments.append(segment)
-        player.seek(to: time)
+        backend.seek(to: time)
         resetLastSegment()
     }
 
     private func resetLastSegment() {
-        lastSkipped = nil
-        segmentRestorationTime = nil
+        DispatchQueue.main.async { [weak self] in
+            self?.lastSkipped = nil
+            self?.segmentRestorationTime = nil
+        }
     }
 
     func resetSegments() {

Model/Segment.swift

@@ -17,6 +17,10 @@ class Segment: ObservableObject, Hashable {
         segment.last!
     }
 
+    var duration: Double {
+        end - start
+    }
+
     var endTime: CMTime {
         CMTime(seconds: end, preferredTimescale: 1000)
     }

Model/Stream.swift

@@ -5,7 +5,7 @@ import Foundation
 // swiftlint:disable:next final_class
 class Stream: Equatable, Hashable, Identifiable {
     enum Resolution: String, CaseIterable, Comparable, Defaults.Serializable {
-        case hd1440p60, hd1440p, hd1080p60, hd1080p, hd720p60, hd720p, sd480p, sd360p, sd240p, sd144p, unknown
+        case hd2160p, hd1440p60, hd1440p, hd1080p60, hd1080p, hd720p60, hd720p, sd480p, sd360p, sd240p, sd144p, unknown
 
         var name: String {
             "\(height)p\(refreshRate != -1 ? ", \(refreshRate) fps" : "")"
@@ -68,6 +68,7 @@ class Stream: Equatable, Hashable, Identifiable {
     var kind: Kind!
 
     var encoding: String!
+    var videoFormat: String!
 
     init(
         instance: Instance? = nil,
@@ -76,7 +77,8 @@ class Stream: Equatable, Hashable, Identifiable {
         hlsURL: URL? = nil,
         resolution: Resolution? = nil,
         kind: Kind = .hls,
-        encoding: String? = nil
+        encoding: String? = nil,
+        videoFormat: String? = nil
     ) {
         self.instance = instance
         self.audioAsset = audioAsset
@@ -85,14 +87,35 @@ class Stream: Equatable, Hashable, Identifiable {
         self.resolution = resolution
         self.kind = kind
         self.encoding = encoding
+        self.videoFormat = videoFormat
     }
 
     var quality: String {
-        kind == .hls ? "adaptive (HLS)" : "\(resolution.name) \(kind == .stream ? "(\(kind.rawValue))" : "")"
+        if resolution == .hd2160p {
+            return "4K (2160p)"
+        }
+
+        return kind == .hls ? "adaptive (HLS)" : "\(resolution.name)\(kind == .stream ? " (\(kind.rawValue))" : "")"
+    }
+
+    var format: String {
+        let lowercasedFormat = (videoFormat ?? "unknown").lowercased()
+        if lowercasedFormat.contains("webm") {
+            return "WEBM"
+        } else if lowercasedFormat.contains("avc1") {
+            return "avc1"
+        } else if lowercasedFormat.contains("av01") {
+            return "AV1"
+        } else if lowercasedFormat.contains("mpeg_4") || lowercasedFormat.contains("mp4") {
+            return "MP4"
+        } else {
+            return lowercasedFormat
+        }
     }
 
     var description: String {
-        "\(quality) - \(instance?.description ?? "")"
+        let formatString = format == "unknown" ? "" : " (\(format))"
+        return "\(quality)\(formatString) - \(instance?.description ?? "")"
     }
 
     var assets: [AVURLAsset] {