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fix: enable yt-dlp EJS solver so YouTube formats resolve

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YouTube gates media formats behind signature / "n" JS challenges that
yt-dlp's bundled solver can't reliably crack. Without the EJS
remote-component solver script yt-dlp warns "Signature/n challenge
solving failed: Some formats may be missing" and downloads break — even
with valid cookies, so it masquerades as a cookie/auth problem.

Pass --remote-components ejs:github by default (env/CLI overridable) on
all four yt-dlp call sites. Needs a recent yt-dlp + deno present; set
YTDLP_REMOTE_COMPONENTS / --remote-components '' to disable.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Zeb Hering
2026-07-05 19:33:28 -07:00
parent b26e321926
commit 82bc524155
3 changed files with 56 additions and 4 deletions
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README.md
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@@ -102,6 +102,7 @@ export LIDARR_API_KEY="your-lidarr-api-key"
| `--workers N` | Parallel metadata fetches during `--repair` (default 4). |
| `--cookies FILE` | yt-dlp `cookies.txt` for authenticated YouTube (avoids bot-check / rate limits). |
| `--cookies-from-browser BROWSER` | Load YouTube cookies from a local browser (e.g. `firefox`). |
| `--remote-components SPEC` | yt-dlp EJS challenge-solver source (default `ejs:github`; needs `deno`). Fixes "signature/n challenge solving failed". `''` to disable. |
| `--retag-from-path` | Offline: re-tag artist/title from folder + filename (see below). |
| `-x`, `--exclude NAME` | Folder under `--root` to skip during `--repair`/`--retag-from-path` (repeatable). |
| `--debug` | Verbose output. |
@@ -163,6 +164,13 @@ throttling. Cookies also apply to normal fetches/downloads. The same can be set
container via `$YTDLP_COOKIES` / `$YTDLP_COOKIES_FROM_BROWSER`. If you do get flagged, **stop** —
retrying extends it; wait ~30-60 min (429) or longer for a bot-check.
**JS challenge solving (not a cookie issue).** Separately from auth, YouTube gates media formats
behind signature / "n" JS challenges. If yt-dlp warns *"Signature solving failed"* / *"n challenge
solving failed: Some formats may be missing"*, downloads break even with valid cookies. musicfetch
passes `--remote-components ejs:github` by default so yt-dlp fetches the [EJS](https://github.com/yt-dlp/yt-dlp/wiki/EJS)
solver and runs it via a local JS runtime — install **[`deno`](https://deno.land)** and use a recent
yt-dlp. Override with `--remote-components` / `$YTDLP_REMOTE_COMPONENTS` (empty disables).
#### Getting YouTube cookies
> ⚠️ Use a **throwaway / secondary Google account**, not your main one — bulk automated