[Flac-dev] MD5 Question

[Josh Coalson]

--- Mike Wren <mikew at etree.org> wrote:
> I know this is probably a really stupid question, but why is FLAC's
> MD5
> checksum different than the MD5 checksum of the original (input)
> .wav?
> 
> I was under the impression that since each FLAC file contains
> metadata that
> can be changed without changing the audio (thus changing the MD5
> checksum of
> that FLAC file) that the checksum of the original .wav file would
> instead be
> used. If that's the case, what am I missing?  Is there some header
> data in
> the .wav file that is getting thrown out?  The original .wav checksum
> is
> identical after i compress and decompress with FLAC, so it appears
> nothing
> is getting stripped.

The MD5 is only on the audio data, not the RIFF/WAVE headers.
It's possible to have other chunks/subchunks which would also
not contribute to the FLAC signature.

Josh


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