TikTok Music Archive Downloader

Follow shared release-shell rules in:

• postplus-shared release-shell rules

Use this skill when TikTok music or sound candidates have already been selected and the user needs local files.

Good fits:

• "把这些 sound 的代表视频下下来"
• "从 TikTok 视频里抽音频做参考"
• "给这批 trending music 建本地素材库"
• "下载样本并保留来源 manifest"

Do not use this skill for:

• discovering trending music
• collecting metadata from hosted collection
• deciding whether an audio is legally usable for public posting

Read First

• Shared chain: postplus-shared TikTok music workflow

Source Skills

Expected inputs usually come from:

• ../tiktok-music-sound-collector/SKILL.md
• ../tiktok-research/SKILL.md

Downloader

Use the shared TikTok downloader:

node ${CLAUDE_SKILL_DIR}/_postplus_shared/00-core/shared-runtime/scripts/download_videos_from_manifest_with_ytdlp.mjs \
  --manifest <download-manifest.json> \
  --output-dir <videos-dir> \
  --report <download-report.json> \
  --concurrency 2 \
  --attempts 3

The manifest should contain:

{
  "items": [
    {
      "sourceId": "musicid-videoid",
      "sourceUrl": "https://www.tiktok.com/@user/video/123"
    }
  ]
}

When the upstream normalized dataset includes both postPageUrl and direct video fields, prefer the canonical TikTok post page URL for sourceUrl. That keeps yt_dlp on the stable page surface instead of an expiring CDN URL.

Audio Extraction

After videos are downloaded, extract audio with ffmpeg.

Prefer m4a for compact review assets:

ffmpeg -y -i <video.mp4> -vn -c:a aac -b:a 192k <audio.m4a>

Use wav only when a downstream model or editor needs uncompressed audio:

ffmpeg -y -i <video.mp4> -vn -ac 1 -ar 48000 <audio.wav>

Archive Layout

Use a stable layout:

<work-folder>/.postplus/tiktok-music-archive-downloader/<run-id>/
  manifest/
    download-manifest.json
    download-report.json
  videos/
  audio/
  index.json

index.json should link every local file back to:

• musicId
• musicTitle
• sourceVideoUrl
• sourceCollectionPath
• local video path
• local audio path
• download status

Verification

Before reporting success:

• confirm downloaded files exist and are non-empty
• confirm audio files exist and are non-empty
• report failures separately instead of hiding them
• keep source URLs in the manifest even when download fails

Handoff

• Need video-level breakdown: run a dedicated visual analysis workflow on the downloaded files
• Need transcription or lyrics/voice extraction: ../audio-transcription/SKILL.md or ../video-transcription/SKILL.md
• Need subtitle files: ../subtitle-packager/SKILL.md

Rights Posture

Treat downloaded TikTok music as research/reference material unless the user confirms rights or platform-licensed use. Do not present extracted audio as cleared for commercial reuse.

Release-Shell Execution Contract

• keep download manifests, reports, extracted videos, and extracted audio under <work-folder>/.postplus/tiktok-music-archive-downloader/
• keep only final user-facing archive summaries or selected exports outside .postplus/
• start with a bounded first pass on a very small manifest before broader archive pulls
• this skill currently depends on explicit host-installed local tools:
  • python3 with yt_dlp
  • ffmpeg
• follow the postplus-shared Local Dependency Bootstrap Rule before the first download or extraction
• if local dependency bootstrap fails, stop immediately instead of switching to ad hoc shell glue