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-request at xiph.org> wrote:
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> 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 <bumblebritches57 at gmail.com>
> To: flac-dev at 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 <bumblebritches57 at gmail.com>
> To: flac-dev at 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 <mvanb1 at gmail.com>
> To: flac-dev at 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 <cterasa at googlemail.com>
> To: flac-dev at 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 <bumblebritches57 at gmail.com>
> To: flac-dev at 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 <mvanb1 at gmail.com>
> To: flac-dev at 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.
>
>
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