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Deluan Quintão
6abc2ed517
* fix(transcoding): preserve source metadata when transcoding downloads Default transcoding commands used `-map 0:a:0` with no metadata mapping, so transcoded files lost all source tags (title, artist, album, etc.). Downloads in the original format were unaffected because the file is copied byte-for-byte. Add `-map_metadata 0 -map_metadata 0:s:0` to the default commands. Both flags are required: `-map_metadata 0` copies format-level tags (MP3/FLAC sources) and `-map_metadata 0:s:0` copies stream-level tags (OPUS/OGG sources), which store tags at different levels. The flags are added in three coordinated places, since for users on the default command the args are built programmatically (buildDynamicArgs) rather than from the stored command string: - consts.go default commands, for new installations - buildDynamicArgs, the active path for default-command users - a migration updating only rows that still hold the exact old default, so customized commands are left untouched AAC is included for consistency but remains a no-op: its `-f adts` container cannot hold metadata, and the MP4 alternative breaks pipe streaming. Fixes #5623 * fix(transcoding): target audio stream for metadata and propagate ctx Address review feedback on the metadata-preservation change: - Use `-map_metadata 0:s:a:0` instead of `0:s:0` to copy tags from the first audio stream specifically. When a source has embedded cover art exposed as a video stream at index 0 (common in music files), `0:s:0` pulls the image stream's metadata and the audio tags are lost. Verified empirically with ffmpeg 7.1.3: a source with video at stream 0 and a tagged audio stream loses its title under `0:s:0` but keeps it under `0:s:a:0`; audio-only OPUS/MP3/FLAC sources are unaffected by the change. - Propagate the migration context via `tx.ExecContext(ctx, ...)` instead of discarding it, so the migration honors cancellation/timeouts. Claude-Session: https://claude.ai/code/session_015iFHDzX53wCKt11qFHMeZk