<div dir="ltr">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.</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Apr 15, 2013 at 3:00 PM, <span dir="ltr"><<a href="mailto:flac-dev-request@xiph.org" target="_blank">flac-dev-request@xiph.org</a>></span> wrote:<br>
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<br>Today's Topics:<br>
<br>
1. Flac 1.3.0pre3 NOT lossless. (Marcus Johnson)<br>
2. FLAC 1.3.0pre3 NOT lossless (Marcus Johnson)<br>
3. Re: FLAC 1.3.0pre3 NOT lossless (Martijn van Beurden)<br>
4. Re: FLAC 1.3.0pre3 NOT lossless (Christoph Terasa)<br>
5. flac 1.3.0 NOT lossless (Marcus Johnson)<br>
6. Re: flac 1.3.0 NOT lossless (Martijn van Beurden)<br>
<br><br>---------- Forwarded message ----------<br>From: Marcus Johnson <<a href="mailto:bumblebritches57@gmail.com">bumblebritches57@gmail.com</a>><br>To: <a href="mailto:flac-dev@xiph.org">flac-dev@xiph.org</a><br>
Cc: <br>Date: Mon, 15 Apr 2013 11:49:41 -0400<br>Subject: [flac-dev] Flac 1.3.0pre3 NOT lossless.<br><div dir="ltr">original wav is 24 bit, 8 channel, size is 41.7MB MD5: 8d38f7dec1dbd9b4645ad6978e0a8d41<div><br></div><div>
wav encoded to flac with -8 -e -p, VERY fast, 1MB in size. MD5: 315dce07d6a30b8060d3a80d960e3a13</div>
<div><br></div><div>flac file decoded back to wav, 41.7MB MD5: 8069fc2d6cf23d08da8019e41cfbd80d</div><div><br></div><div>Flac compiled with make -j8 -o3, on Mac OS X 10.8.3</div><div><br></div>
<div>passed all tests. :O</div></div>
<br><br>---------- Forwarded message ----------<br>From: Marcus Johnson <<a href="mailto:bumblebritches57@gmail.com">bumblebritches57@gmail.com</a>><br>To: <a href="mailto:flac-dev@xiph.org">flac-dev@xiph.org</a><br>
Cc: <br>Date: Mon, 15 Apr 2013 11:54:28 -0400<br>Subject: [flac-dev] FLAC 1.3.0pre3 NOT lossless<br><div dir="ltr">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.<div>
<br></div><div>the archive is 7zip, Idk where to upload it so I'll just send it to depositfiles.</div>
<div><br></div><div><a href="http://depositfiles.com/files/90anghniw" target="_blank">http://depositfiles.com/files/90anghniw</a><br></div><div><br></div><div><br></div></div>
<br><br>---------- Forwarded message ----------<br>From: Martijn van Beurden <<a href="mailto:mvanb1@gmail.com">mvanb1@gmail.com</a>><br>To: <a href="mailto:flac-dev@xiph.org">flac-dev@xiph.org</a><br>Cc: <br>Date: Mon, 15 Apr 2013 18:03:47 +0200<br>
Subject: Re: [flac-dev] FLAC 1.3.0pre3 NOT lossless<br>On 15-04-13 17:54, Marcus Johnson wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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.<br>
<br>
the archive is 7zip, Idk where to upload it so I'll just send it to depositfiles.<br>
</blockquote>
<br>
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.<br>
<br>
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 <a href="http://xiph.org/flac/faq.html#tools__two_bytes_short" target="_blank">http://xiph.org/flac/faq.html#<u></u>tools__two_bytes_short</a>) FLAC compresses the audio data losslessly, not the WAV file itself, that's why simple MD5-summing doesn't cut it.<br>
<br>
The FLAC file is small and encoding is very fast because most of the file is silence, which is very easy to encode.<br>
<br>
<br>
<br>
<br><br>---------- Forwarded message ----------<br>From: Christoph Terasa <<a href="mailto:cterasa@googlemail.com">cterasa@googlemail.com</a>><br>To: <a href="mailto:flac-dev@xiph.org">flac-dev@xiph.org</a><br>Cc: <br>
Date: Mon, 15 Apr 2013 18:44:31 +0200<br>Subject: Re: [flac-dev] FLAC 1.3.0pre3 NOT lossless<br>On 4/15/2013 6:03 PM, Martijn van Beurden wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 15-04-13 17:54, Marcus Johnson wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
the audio was also 192,000khz sample rate, forgot to mention that, adn<br>
here are the audio files, the original, the flac, and the decoded from<br>
flac.<br>
<br>
the archive is 7zip, Idk where to upload it so I'll just send it to<br>
depositfiles.<br>
</blockquote>
As far as I can see, these audio files are lossless and the WAV files<br>
are identical when regarding only audio data. When I open both in<br>
Audacity and invert one of them, the channels cancel each other exactly,<br>
so the audio data must be the same.<br>
</blockquote>
<br>
Bit-comparing both WAV streams and the FLAC stream (I did it with foobar2000) does also show that the decoded data is the same.<br>
<br>
Christoph<br>
<br>
<br><br>---------- Forwarded message ----------<br>From: Marcus Johnson <<a href="mailto:bumblebritches57@gmail.com">bumblebritches57@gmail.com</a>><br>To: <a href="mailto:flac-dev@xiph.org">flac-dev@xiph.org</a><br>
Cc: <br>Date: Mon, 15 Apr 2013 12:47:20 -0400<br>Subject: [flac-dev] flac 1.3.0 NOT lossless<br><div dir="ltr">Also, FFmpeg encodes the audio to only 3/4th the size, that's kinda strange.</div>
<br><br>---------- Forwarded message ----------<br>From: Martijn van Beurden <<a href="mailto:mvanb1@gmail.com">mvanb1@gmail.com</a>><br>To: <a href="mailto:flac-dev@xiph.org">flac-dev@xiph.org</a><br>Cc: <br>Date: Mon, 15 Apr 2013 18:56:56 +0200<br>
Subject: Re: [flac-dev] flac 1.3.0 NOT lossless<br>
<div bgcolor="#FFFFFF" text="#000000">
<div>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.<br>
<br>
On 15-04-13 18:47, Marcus Johnson wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Also, FFmpeg encodes the audio to only 3/4th the
size, that's kinda strange.</div>
<br>
<fieldset></fieldset>
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