Bug#547921: wav file decoded from ape is not identical with original wav file

[Sebastian Dröge]

Am Mittwoch, den 23.09.2009, 00:26 +0900 schrieb cogniti:
> Package: gstreamer0.10-ffmpeg
> Version: 0.10.4-3
> Severity: important
> 
> Original file: original.wav
> $ ls -l original.wav
> -rw-r--r-- 1 user user 671890796 2009-09-22 21:36 original.wav
> $ sha1sum original.wav
> a458caae67e14f34233db66fc03a6536a5c70baa  original.wav
> 
> $ mac original.wav CDImage.ape -c2000
> $ mac CDImage.ape mac.wav -d
> $ sha1sum *.wav
> a458caae67e14f34233db66fc03a6536a5c70baa  mac.wav
> a458caae67e14f34233db66fc03a6536a5c70baa  original.wav
> 
> BUT,
> After converting CDImage.ape into CDImage.wav using SoundConverter 1.3.1
> and gstreamer-ffmpeg  0.10.4-3
> (CDImage.ape --> CDImage.wav)
> 
> $ sha1sum *.wav
> 264a891d8ee826be4060a7495a2a49724239346c  CDImage.wav
> a458caae67e14f34233db66fc03a6536a5c70baa  mac.wav
> a458caae67e14f34233db66fc03a6536a5c70baa  original.wav
> 
> $ ls -l
> -rw-r--r-- 1 user user 241330948 2009-09-22 23:29 CDImage.ape
> -rw-r--r-- 1 user user 655375724 2009-09-22 23:31 CDImage.wav
> -rw-r--r-- 1 user user 671890796 2009-09-22 23:26 mac.wav
> -rw-r--r-- 1 user user 671890796 2009-09-22 21:36 original.wav
> 
> original.wav and CDImage.wav are not same.

Did you actually check that the audio content of those wav files is
different (for example by substracting one from the other in audacity)?
wav is just a container format that can contain random additional
metadata and it's not guaranteed that exactly the same metadata is
generated again in your case. But the audio data should be bit
identical.
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