Okay, I was thinking it may have been something to do with the header, but I wasn't sure how to verify that. thanks guys.
On Mon, Apr 15, 2013 at 3:00 PM, <flac-dev-requ...@xiph.org> wrote: > Send flac-dev mailing list submissions to > flac-dev@xiph.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.xiph.org/mailman/listinfo/flac-dev > or, via email, send a message with subject or body 'help' to > flac-dev-requ...@xiph.org > > You can reach the person managing the list at > flac-dev-ow...@xiph.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of flac-dev digest..." > > Today's Topics: > > 1. Flac 1.3.0pre3 NOT lossless. (Marcus Johnson) > 2. FLAC 1.3.0pre3 NOT lossless (Marcus Johnson) > 3. Re: FLAC 1.3.0pre3 NOT lossless (Martijn van Beurden) > 4. Re: FLAC 1.3.0pre3 NOT lossless (Christoph Terasa) > 5. flac 1.3.0 NOT lossless (Marcus Johnson) > 6. Re: flac 1.3.0 NOT lossless (Martijn van Beurden) > > > ---------- Forwarded message ---------- > From: Marcus Johnson <bumblebritche...@gmail.com> > To: flac-dev@xiph.org > Cc: > Date: Mon, 15 Apr 2013 11:49:41 -0400 > Subject: [flac-dev] Flac 1.3.0pre3 NOT lossless. > original wav is 24 bit, 8 channel, size is 41.7MB > MD5: 8d38f7dec1dbd9b4645ad6978e0a8d41 > > wav encoded to flac with -8 -e -p, VERY fast, 1MB in size. > MD5: 315dce07d6a30b8060d3a80d960e3a13 > > flac file decoded back to wav, 41.7MB MD5: 8069fc2d6cf23d08da8019e41cfbd80d > > Flac compiled with make -j8 -o3, on Mac OS X 10.8.3 > > passed all tests. :O > > > ---------- Forwarded message ---------- > From: Marcus Johnson <bumblebritche...@gmail.com> > To: flac-dev@xiph.org > Cc: > Date: Mon, 15 Apr 2013 11:54:28 -0400 > Subject: [flac-dev] FLAC 1.3.0pre3 NOT lossless > the audio was also 192,000khz sample rate, forgot to mention that, adn > here are the audio files, the original, the flac, and the decoded from flac. > > the archive is 7zip, Idk where to upload it so I'll just send it to > depositfiles. > > http://depositfiles.com/files/90anghniw > > > > > ---------- Forwarded message ---------- > From: Martijn van Beurden <mva...@gmail.com> > To: flac-dev@xiph.org > Cc: > Date: Mon, 15 Apr 2013 18:03:47 +0200 > Subject: Re: [flac-dev] FLAC 1.3.0pre3 NOT lossless > On 15-04-13 17:54, Marcus Johnson wrote: > >> the audio was also 192,000khz sample rate, forgot to mention that, adn >> here are the audio files, the original, the flac, and the decoded from flac. >> >> the archive is 7zip, Idk where to upload it so I'll just send it to >> depositfiles. >> > > As far as I can see, these audio files are lossless and the WAV files are > identical when regarding only audio data. When I open both in Audacity and > invert one of them, the channels cancel each other exactly, so the audio > data must be the same. > > The checksums don't have to match because WAV is a complicated standard > and FLAC might be writing the file a little different (see for example > http://xiph.org/flac/faq.html#**tools__two_bytes_short<http://xiph.org/flac/faq.html#tools__two_bytes_short>) > FLAC compresses the audio data losslessly, not the WAV file itself, that's > why simple MD5-summing doesn't cut it. > > The FLAC file is small and encoding is very fast because most of the file > is silence, which is very easy to encode. > > > > > > ---------- Forwarded message ---------- > From: Christoph Terasa <cter...@googlemail.com> > To: flac-dev@xiph.org > Cc: > Date: Mon, 15 Apr 2013 18:44:31 +0200 > Subject: Re: [flac-dev] FLAC 1.3.0pre3 NOT lossless > On 4/15/2013 6:03 PM, Martijn van Beurden wrote: > >> On 15-04-13 17:54, Marcus Johnson wrote: >> >>> the audio was also 192,000khz sample rate, forgot to mention that, adn >>> here are the audio files, the original, the flac, and the decoded from >>> flac. >>> >>> the archive is 7zip, Idk where to upload it so I'll just send it to >>> depositfiles. >>> >> As far as I can see, these audio files are lossless and the WAV files >> are identical when regarding only audio data. When I open both in >> Audacity and invert one of them, the channels cancel each other exactly, >> so the audio data must be the same. >> > > Bit-comparing both WAV streams and the FLAC stream (I did it with > foobar2000) does also show that the decoded data is the same. > > Christoph > > > > ---------- Forwarded message ---------- > From: Marcus Johnson <bumblebritche...@gmail.com> > To: flac-dev@xiph.org > Cc: > Date: Mon, 15 Apr 2013 12:47:20 -0400 > Subject: [flac-dev] flac 1.3.0 NOT lossless > Also, FFmpeg encodes the audio to only 3/4th the size, that's kinda > strange. > > > ---------- Forwarded message ---------- > From: Martijn van Beurden <mva...@gmail.com> > To: flac-dev@xiph.org > Cc: > Date: Mon, 15 Apr 2013 18:56:56 +0200 > Subject: Re: [flac-dev] flac 1.3.0 NOT lossless > That's because FFmpeg is based on flake instead of FLAC. It seems FFmpeg > outperforms FLAC here by quite a large margin, usually the differences > aren't very large at all. > > On 15-04-13 18:47, Marcus Johnson wrote: > > Also, FFmpeg encodes the audio to only 3/4th the size, that's kinda > strange. > > > _______________________________________________ > flac-dev mailing > listflac-dev@xiph.orghttp://lists.xiph.org/mailman/listinfo/flac-dev > > > > _______________________________________________ > flac-dev mailing list > flac-dev@xiph.org > http://lists.xiph.org/mailman/listinfo/flac-dev > >
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