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video-acquisition

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UpdatedMay 21, 2026 at 01:01

Domain expertise for downloading a YouTube video locally at a resolution suitable for later frame OCR. Sub-skill of `youtube-extraction`. Use when the parent skill needs to acquire the source video file before any frame, transcript, or content analysis.

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aberrantCode/llm_skills

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name	video-acquisition
description	Domain expertise for downloading a YouTube video locally at a resolution suitable for later frame OCR. Sub-skill of `youtube-extraction`. Use when the parent skill needs to acquire the source video file before any frame, transcript, or content analysis.

Video Acquisition

Sub-skill of youtube-extraction. The parent skill calls this when it needs the source video on disk. You receive url and <basename> from the caller.

Goal

Place the video at:

docs/youtube-extraction/<basename>/video.<ext>

…at a resolution high enough for OCR of code and IDE chrome. Aim for 1080p when available; accept 720p when the upload caps there.

Why resolution matters

Frame OCR quality scales with pixel density. A 480p frame loses character distinctions that are critical for code (l vs 1, O vs 0, : vs ;). If you accept a low-res download here, every downstream sub-skill pays for it.

Primary command

yt-dlp -f "bv*[height<=1080]+ba/b[height<=1080]" `
  --merge-output-format mp4 `
  -o "docs/youtube-extraction/<basename>/video.%(ext)s" `
  "<url>"

The format selector picks the best video stream up to 1080p plus the best audio, falling back to a single 1080p-or-lower combined stream when separate streams are unavailable. Merging into mp4 is friendlier to ffmpeg downstream.

Also fetch metadata in the same pass

yt-dlp --skip-download --write-info-json --write-description `
  -o "docs/youtube-extraction/<basename>/info.%(ext)s" `
  "<url>"
Move-Item -Force docs/youtube-extraction/<basename>/info.info.json `
  docs/youtube-extraction/<basename>/metadata.json
Move-Item -Force docs/youtube-extraction/<basename>/info.description `
  docs/youtube-extraction/<basename>/description.txt

metadata.json carries the title, channel, duration, publish date, view count, and tags — every later sub-skill leans on these. description.txt often holds the canonical repo URL and file paths the speaker references.

Failure modes and fallbacks

Symptom	Fallback
`Sign in to confirm you're not a bot`	Pass `--cookies-from-browser chrome` (or whichever browser the user is signed into YouTube on).
Live stream / premiere	Skip — extraction needs a finalised VOD. Surface a clear error.
Members-only / private	Authenticated cookies as above. If still blocked, surface to the user.
Age-restricted	`--cookies-from-browser` again.
1080p unavailable	Drop to `bv*[height<=720]+ba/b[height<=720]`. Note the resolution drop in `EXTRACTION.md` later.
Multiple parts (chapters)	Single download — chapters are timestamps within one file.

Sanity checks before returning

Confirm video.<ext> exists and is non-empty.
Confirm metadata.json parses as JSON and has a duration field.
Confirm the duration is sensible (> 0, < 6 hours for typical tutorials — longer is fine but warn).

Idempotence

If video.<ext> already exists with non-zero size for the same <basename>, do not re-download. Re-fetch metadata and description anyway, since channels can edit those after upload.

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name	video-acquisition
description	Domain expertise for downloading a YouTube video locally at a resolution suitable for later frame OCR. Sub-skill of `youtube-extraction`. Use when the parent skill needs to acquire the source video file before any frame, transcript, or content analysis.

Video Acquisition

Sub-skill of youtube-extraction. The parent skill calls this when it needs the source video on disk. You receive url and <basename> from the caller.

Goal

Place the video at:

docs/youtube-extraction/<basename>/video.<ext>

…at a resolution high enough for OCR of code and IDE chrome. Aim for 1080p when available; accept 720p when the upload caps there.

Why resolution matters

Primary command

yt-dlp -f "bv*[height<=1080]+ba/b[height<=1080]" `
  --merge-output-format mp4 `
  -o "docs/youtube-extraction/<basename>/video.%(ext)s" `
  "<url>"

Also fetch metadata in the same pass

yt-dlp --skip-download --write-info-json --write-description `
  -o "docs/youtube-extraction/<basename>/info.%(ext)s" `
  "<url>"
Move-Item -Force docs/youtube-extraction/<basename>/info.info.json `
  docs/youtube-extraction/<basename>/metadata.json
Move-Item -Force docs/youtube-extraction/<basename>/info.description `
  docs/youtube-extraction/<basename>/description.txt

Failure modes and fallbacks

Symptom	Fallback
`Sign in to confirm you're not a bot`	Pass `--cookies-from-browser chrome` (or whichever browser the user is signed into YouTube on).
Live stream / premiere	Skip — extraction needs a finalised VOD. Surface a clear error.
Members-only / private	Authenticated cookies as above. If still blocked, surface to the user.
Age-restricted	`--cookies-from-browser` again.
1080p unavailable	Drop to `bv*[height<=720]+ba/b[height<=720]`. Note the resolution drop in `EXTRACTION.md` later.
Multiple parts (chapters)	Single download — chapters are timestamps within one file.

Sanity checks before returning

Confirm video.<ext> exists and is non-empty.
Confirm metadata.json parses as JSON and has a duration field.
Confirm the duration is sensible (> 0, < 6 hours for typical tutorials — longer is fine but warn).

Idempotence

If video.<ext> already exists with non-zero size for the same <basename>, do not re-download. Re-fetch metadata and description anyway, since channels can edit those after upload.