On Fri, Jun 1, 2012 at 3:58 PM, kurdy <kurdy_ch-forum at yahoo.fr> wrote: > From a flac file I did avconv -i f.flac -acodec alac f.m4a > then back to flac avconv -i f.m4a -acodec flac f.flac Better try some other reference format (pcm ideally), as flac may have multiple representations of the same waveforms.