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video-download

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更新日2026年5月5日 21:48

Download videos from Instagram, YouTube, TikTok, Twitter/X, Facebook, and 1000+ other platforms as MP4 files using yt-dlp. Auto-recovers from YouTube bot detection ("Sign in to confirm you're not a bot", LOGIN_REQUIRED) by rotating through browser cookies and cookie files without manual intervention. Use this skill when the user wants to download, save, or grab one or more videos from any social media or video platform URL. Supports single videos or full playlists, configurable resolution, and saving to a specified target folder.

インストール

Codex または Claude でインストールこの Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。

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maystudios

maystudios/claude-skills

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Video Download Skill

Wraps yt-dlp with automatic recovery for YouTube anti-bot challenges.

Tool

scripts/download.py — installs yt-dlp on first run, merges video+audio to MP4, auto-rotates strategies on bot detection, uses a download-archive for safe resume.

Workflow

Collect all URLs from the user's request.
Determine output directory (current working directory if unspecified).
Decide single-video vs playlist mode:
- User says "this video" / single URL → leave default (single-video).
- User says "playlist" / "all videos" / passes a playlist?list= URL → add --playlist.
Run the script. If YouTube bot detection hits, the script auto-rotates strategies.
Report which files were saved and which strategy worked.

Usage

# Single video, current directory
python scripts/download.py "https://www.youtube.com/watch?v=..."

# Multiple URLs to a folder
python scripts/download.py "URL1" "URL2" -o "/path/to/output"

# Full playlist as 720p MP4
python scripts/download.py "https://www.youtube.com/playlist?list=..." --playlist -o "./out"

# Force a specific browser for cookies (skips auto-rotation)
python scripts/download.py "URL" --cookies-from-browser chrome

# Force a manual cookies.txt file
python scripts/download.py "URL" --cookies "~/Downloads/www.youtube.com_cookies.txt"

# Higher quality
python scripts/download.py "URL" --max-height 1080

Flags

Flag	Default	Notes
`-o`, `--output`	cwd	Output directory
`--max-height`	720	Max video height (e.g. 1080, 480)
`--playlist`	off	Download full playlist; default is single-video
`--cookies-from-browser`	auto	Force one browser; skips auto-rotation
`--cookies`	auto	Force one cookies.txt file; skips auto-rotation
`--no-archive`	off	Disable `.download-archive.txt` resume tracking

Auto-Recovery Strategy Chain

When a request fails with bot-detection markers (Sign in to confirm, LOGIN_REQUIRED), the script automatically advances through these strategies in order, stopping at the first one that succeeds:

No auth + throttle — Default. Sleep intervals between requests.
Player client rotation — default,tv,mweb,web_safari. Bypasses softer blocks.
Browser cookies rotation — Tries chrome → edge → firefox → brave → vivaldi → opera, only browsers actually installed on the system.
Cookies file discovery — Picks the newest valid cookies file from ~/Downloads/www.youtube.com_cookies.txt, youtube*cookies*.txt, cookies.txt (< 7 days old to be considered fresh).

If all 4 strategies fail, the script prints a context-aware recovery walkthrough (see "Recovery instructions for the user" below).

If the user explicitly passes --cookies-from-browser or --cookies, the chain is skipped and only that source is used (useful when the user already knows what works).

Recovery instructions for the user

When all strategies fail, the script auto-prints a step-by-step guide. Surface the most relevant subset to the user verbatim — it is concrete and actionable.

The guide branches based on what the script saw:

Cookies file found but rejected (file is stale): tell the user to re-export cookies right now, since YouTube invalidates cookies aggressively once a bot-block triggers.
No cookies file found: walk the user through the first-time export.
Otherwise: just list alternatives (close browser, change network, wait).

Cookie export walkthrough (the part the user will likely need)

Install a cookie export browser extension:
- Chrome / Edge / Brave / Vivaldi / Opera: "Get cookies.txt LOCALLY" — https://chromewebstore.google.com/detail/get-cookiestxt-locally/cclelndahbckbenkjhflpdbgdldlbecc
- Firefox: "cookies.txt" — https://addons.mozilla.org/en-US/firefox/addon/cookies-txt/
Open https://www.youtube.com in that browser, signed in to a Google account.
Click the extension's toolbar icon:
- "Get cookies.txt LOCALLY" → "Export As" → Netscape format → use the "Current Site" option so only youtube.com cookies are included.
- Firefox "cookies.txt" → "Current Site" → Save.
Save the file to the OS default Downloads folder. Any of these names work (auto-detected, newest wins):
- www.youtube.com_cookies.txt (extension default — easiest)
- youtube.com_cookies.txt
- cookies.txt
Re-run the same download command. Strategy 4 picks the file up automatically.

When to recommend each alternative

Close the browser (Chrome / Edge): fastest fix on Windows, where App-Bound Encryption locks the cookie database while the browser runs. Costs the user their open tabs unless "Continue where you left off" is enabled.
Different network (mobile hotspot, VPN): bypasses an IP-level block. Fastest if the user already has a VPN.
Wait it out: YouTube IP blocks lift on their own, usually within 24 h. Recommend only if no other option fits.

Resume / Re-Run Safety

--download-archive .download-archive.txt is enabled by default. Already-downloaded videos are skipped on re-runs, so it's safe to re-run after partial failure or when adding more URLs to the same folder. Pass --no-archive to disable.

Output Filename Pattern

Single video: {title} [{id}].mp4
Playlist: {NNN} - {title} [{id}].mp4 (zero-padded index keeps order in file managers)

--windows-filenames is always on, so files are safe across OSes.

Authentication Notes

Auto-rotation handles most cases without user input.
--cookies-from-browser chrome requires Chrome closed on Windows (App-Bound Encryption locks the cookie DB while Chrome is running).
If Chrome must stay open, recommend the user export cookies via the "Get cookies.txt LOCALLY" Chrome extension and drop the file in ~/Downloads/. The script picks it up automatically on next run.

Supported Platforms

YouTube (single + playlists), Instagram, TikTok, Twitter/X, Facebook, Vimeo, Reddit, and 1000+ more via yt-dlp.

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