Youtube Downloader

YouTube Downloader

Download YouTube videos or extract audio. Files are named after the video title, saved to the user's preferred location, and remuxed to play correctly as video on iOS.

How This Skill Works

This skill runs yt-dlp + ffmpeg inside the Minis Linux sandbox (iSH). Two iSH-specific workarounds are required:

1. Manual DASH merge: yt-dlp's built-in video+audio merger crashes in iSH. For high-quality formats (1080p, 1440p), the script downloads video and audio separately using -k (keep video), lets the merger fail, then merges them with a direct ffmpeg call.

2. iOS container fix: YouTube's MP4 files use the mp42 brand, which iOS may treat as audio-only. The script remuxes to M4V (for H.264) or standard mp4 (for AV1/VP9) with +faststart so iOS Files plays them as video.

First Run — Onboarding

On the FIRST time this skill triggers, run onboarding before downloading anything.

Step 1: Check status

sh /var/minis/skills/youtube-downloader/scripts/yt-config.sh status

If onboarded: true, skip to Normal Operation. If onboarded: false (or config doesn't exist), continue onboarding.

Step 2: Install dependencies

If yt-dlp: no or ffmpeg: no in the status output, install them:

apk add yt-dlp ffmpeg py3-pip
pip install --upgrade --break-system-packages yt-dlp

The pip upgrade is essential — Alpine's yt-dlp package is stale and YouTube's player changes frequently. This takes ~30 seconds.

Step 3: Ask the user two questions

Present as a friendly numbered list. Wait for answers.

Question 1 — Quality preference:

What quality do you want by default?

1. 1080p video — Full HD, best balance of quality and size (default)
2. 1440p video — 2K, highest quality, large files (~300 MB per 10 min)
3. 720p video — HD, smaller file size
4. Audio only — best for music/podcasts, smallest file
5. Ask me every time — no default, I'll pick per video

Question 2 — Where to save:

Where should I save your downloads?

1. iOS Files app (Downloads folder) — appears in Files → Downloads
2. iOS Photos (YouTube Downloads album) — appears in Photos
3. Keep in Minis — stays in the app's attachments folder

Step 4: Set up Files mount (if user chose option 1)

Check if the Downloads mount already exists via the status command. If downloads_mount: yes, skip. If downloads_mount: no, tell the user:

To save videos to your Files app, I need you to mount your Downloads folder:

1. Tap this link: Mount External Folders
2. Tap "Add Mount"
3. Navigate to the folder you want (e.g., iCloud Drive → Downloads, or On My iPhone → Downloads)
4. Name it "Downloads"
5. Come back here and tell me when you're done

After the user confirms, re-run the status check to verify downloads_mount: yes.

Step 5: Save config

sh /var/minis/skills/youtube-downloader/scripts/yt-config.sh set quality "<chosen_quality>"
sh /var/minis/skills/youtube-downloader/scripts/yt-config.sh set save_mode "<chosen_save_mode>"
sh /var/minis/skills/youtube-downloader/scripts/yt-config.sh complete

• Quality: "1080p", "1440p", "720p", "360p", "audio", or "" (empty string for "ask every time")
• save_mode: "files", "photos", or "minis"

Step 6: Offer a test download

Tell the user setup is complete. Offer to download a short test video at 360p so they can verify the flow:

sh /var/minis/skills/youtube-downloader/scripts/yt-download.sh "https://www.youtube.com/watch?v=aqz-KE-bpKQ" 360p <save_mode>

Replace <save_mode> with whatever the user chose (files, photos, or minis). 360p is used for the test because it's the most reliable quality — higher quality works the same way once configured.

Confirm the file appeared where they expected. Then proceed with whatever they originally asked for.

Normal Operation

sh /var/minis/skills/youtube-downloader/scripts/yt-download.sh "<URL>" [quality] [save_mode]

• Quality is optional — if omitted, uses the saved default from config
• save_mode is optional — if omitted, uses the saved default from config (files, photos, or minis)
• If the user specified a quality in their message ("just the audio", "1440p", etc.), use that
• If the user specified where to save ("save to photos", "put it in files"), pass that as save_mode

After download, report to the user

The script prints one of three status lines. Read it and tell the user:

• If SAVED_TO_FILES: "Saved to your Files app → Downloads folder. Pull to refresh if you don't see it yet."
• If SAVED_TO_PHOTOS: "Saved to the 'YouTube Downloads' album in your Photos app."
• If KEPT_IN_ATTACHMENTS: The file is at /var/minis/attachments/<filename>. Display it inline and tell the user it's available in Minis.
• Always include the video title and file size.

Quality Reference

DASH formats (1080p, 1440p) download video and audio separately, then merge with ffmpeg (yt-dlp's built-in merger fails in iSH). H.264 streams go into the Apple M4V container; AV1/VP9 streams go into standard mp4. Both play as video on iOS. All video downloads are remuxed with +faststart and the correct container brand.

Troubleshooting

403 Forbidden on DASH streams: YouTube transiently blocks DASH downloads when using the android vr client fallback (no JS runtime available). Retry — it usually works within 1-2 attempts. Pre-merged formats (360p, 720p) bypass this entirely.

"No supported JavaScript runtime": iSH has no Deno/Node, so yt-dlp can't do YouTube's nsig extraction. Pre-merged formats (18, 22) and audio (140) work without JS. DASH formats work via the android vr client fallback but may intermittently 403.

yt-dlp out of date: YouTube breaks extraction often. Run pip install --upgrade --break-system-packages yt-dlp.

Downloads mount disappears: The mount may disconnect if iCloud sync state changes. Run yt-config.sh status to check. If broken, guide the user to re-mount via Mount External Folders.

Large files: 1440p files can exceed 450 MB. If the app crashes or becomes unstable, stick to 1080p or lower.