[Libav-user] Re : ALAC codec I am not sure it's really lossless

Claudio Freire klaussfreire at gmail.com
Sat Jun 2 20:19:12 CEST 2012

Glad you managed to solve it, but:

On Sat, Jun 2, 2012 at 5:34 AM, kurdy_ch-forum at yahoo.fr <
kurdy_ch-forum at yahoo.fr> wrote:

> As flac is lossless the number of frame and md5 code of the track should
> be the same.

That's false. MD5 processes bytes, not samples, and as gzip can represent
the same text in multiple way, with different MD5 each time, the same
happens with other lossless codec.

Lossless != stable. PCM is both lossless *and* stable, so that's why you
ought to compare PCM only.
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