Why unify a music library with AAC to FLAC instead of only toggling server knobs?
Mixed m4a, aac, and flac trees confuse scanners and encourage surprise server-side transcodes to Opus or AAC on phones. Searchers type plex aac flac, roon library format, jellyfin disable transcoding, replaygain flac, and podcast m4a bulk convert because they want predictable playback paths, not another mystery bitrate ladder. FLAC after AAC decode keeps PCM honest while letting libraries share one decoder profile—yet podcast rights, store purchases, and guest audio still need separate license hygiene. Huge embedded art slows tag reads—resize covers or move hi-res scans to object storage during migration. Ai2Done keeps the library variant operational: snapshot current transcoding policies, pilot ten albums, rescan CPU load, batch, then verify mobile offline caches on three devices before deleting AAC mirrors anyone still streams.
How to batch AAC into FLAC without wrecking Plex or Roon scans
- Open AAC to FLAC, pick the music-library variant, document whether remote streaming caps still force lossy targets, and read upload limits before touching terabyte collections.
- Pilot ten representative albums including podcasts, classical splits, and long EDM mixes, trigger a library scan, and watch CPU, artwork, and chapter markers.
- Batch with manifests, reconcile counts and byte curves, update household docs about read-only AAC mirrors, and keep receipts for purchased downloads beside FLAC derivatives.