Video playback progress and restoring time for previously played

Extensions/Double+Format.swift

@@ -0,0 +1,17 @@
+import Foundation
+
+extension Double {
+    func formattedAsPlaybackTime() -> String? {
+        guard !isZero else {
+            return nil
+        }
+
+        let formatter = DateComponentsFormatter()
+
+        formatter.unitsStyle = .positional
+        formatter.allowedUnits = self >= (60 * 60) ? [.hour, .minute, .second] : [.minute, .second]
+        formatter.zeroFormattingBehavior = [.pad]
+
+        return formatter.string(from: self)
+    }
+}