SongDownloader: write metadata to m4a (DASH) downloads - #239
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FLAC downloads are tagged in-flight by the FlacStreamTagger, but DASH streams are written to disk untagged. After a download that resolves to a m4a file, write the same tags (title, artists, album, cover, etc.) post-download using node-taglib-sharp (pure JS, no ffmpeg or native binaries). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Have you tested this verifying it works? Also going to close this, please integrate the library/functionality (after validating it works) into the main Luna lib which has all the tag generation etc already handled. |
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Fair call — it turned out it did NOT work as submitted: TIDAL DASH downloads are raw concatenated CMAF segments (fragmented MP4), and node-taglib-sharp can't write tags to those at all. Tagging requires remuxing to a progressive MP4 first. Now integrated into the Luna lib as requested, with a pure-JS remux (bit-identical packet copy, encoder delay/gapless preserved) and validated end to end (MD5-verified offline + live in the client): Inrixia/TidaLuna#176 |
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Currently only FLAC downloads get tagged (the FlacStreamTagger runs in-flight on the
vnd.tidal.btsbranch), while DASH streams are written to disk as raw untagged m4a files.This PR adds a post-download tagging step using node-taglib-sharp (pure JS, no ffmpeg or native binaries): when the downloaded file resolves to m4a, the same tags Luna already builds (
flacTags()) are written to the file, including cover art. Individual fields that fail to write are skipped best-effort so a bad tag never corrupts the download.Generated with Claude Code