Why convert AAC to FLAC instead of only renaming the file?
FLAC losslessly compresses linear PCM after your AAC decoder emits samples—container losslessness is not the same as recovering pre-AAC air-band detail the perceptual model threw away. Searchers ask aac to flac lossy or not, ffmpeg aac flac, m4a aac to flac bulk, plex roon flac library, and DAM lossless intake because policies and players care about extensions, MIME gates, and predictable decode paths. HE-AAC, AAC-LC, and parametric stereo decode to different channel maps—golden-test a few stems before you batch terabytes. Mixing 44.1 kHz and 48 kHz without documenting SRC invites seam clicks on gapless albums and angry hi-fi threads. Podcast rights, store purchases, and confidential dictation survive every FLAC wrap—sidecars must still disclose lineage. Ai2Done keeps AAC to FLAC honest: read caps, pick archive versus CD-shape versus tagging goals, export probes with checksums, pair AAC masters to FLAC derivatives in tickets, and only then discuss deleting originals legal still calls evidence.
How to convert AAC into FLAC your downstream gate will trust
- Open AAC to FLAC in a desktop browser, upload raw AAC or m4a, read AAC profile, loudness tags, and channel map, then read max size and duration limits before touching long concert captures.
- Choose bit depth and sample rate policies that match archives or music servers, export thirty-to-sixty-second probes into foobar2000, MusicBee, or your DAW template, and listen for SRC, phase, or fold-down artifacts.
- After batching, verify durations and sizes, write JSON sidecars with SOURCE=AAC and tool versions, store reciprocal checksums between AAC masters and FLAC derivatives, and retain AAC until compliance signs the migration.