gnomebaker
Johnny Rosenberg
gurus.knugum at gmail.com
Sun Oct 23 19:53:56 UTC 2011
2011/10/23 Ioannis Vranos <ioannis.vranos at gmail.com>:
> On Sun, Oct 23, 2011 at 10:15 PM, Johnny Rosenberg
> <gurus.knugum at gmail.com> wrote:
>> 2011/10/23 Ioannis Vranos <ioannis.vranos at gmail.com>:
>>> On Sun, Oct 23, 2011 at 2:43 PM, Johnny Rosenberg
>>> <gurus.knugum at gmail.com> wrote:
>>>> that. Maybe someone who reads this right now feels like doing a quick
>>>> test to see if it works properly with Ubuntu 11.04 or Ubuntu 11.10?
>>>
>>> I created an audio CD image from a .flac successfully under Ubuntu 11.10.
>>>
>>> The .flac properties are attached as a screenshot with this email.
>>
>> The low bitrate indicates that this was not a 24-bit FLAC, was it?
>> I have actually never seen bitrate numbers for FLAC files; where did
>> you get those figures?
>
> By right-clicking on the .flac, selecting properties, and going to
> audio. Also Totem when playing a flac, displays such properties in its
> sidebar. However I am not sure whether FLAC format really has a
> bitrate, or the displayed properties are something for comparison with
> lossy sound formats.
>
> What is the difference between a 24-bit FLAC and a 16-bit one?
Each sample is 24 bits (=3 bytes) instead of 16 (2 bytes). So
basically a 24 bit FLAC is 50% larger than it would be if converted to
16 bits.
Why 24 bits? Well, the more the better, in most cases. More bits, less
distortion.
>
>
>
>>
>> What do you get from the following command?
>> sox <filename> -n stats
>>
>> I am particularly interested in ”bit-depths”.
>
>
> Overall Left Right
> DC offset -0.000007 -0.000007 0.000004
> Min level -0.838928 -0.838928 -0.838928
> Max level 0.838898 0.838898 0.838898
> Pk lev dB -1.53 -1.53 -1.53
> RMS lev dB -13.05 -13.01 -13.08
> RMS Pk dB -6.41 -6.41 -6.42
> RMS Tr dB -116.10 -113.27 -116.10
> Crest factor - 3.75 3.78
> Flat factor 22.13 22.81 21.25
> Pk count 38.8k 42.0k 35.5k
> Bit-depth 16/16 16/16 16/16
So this is a 16 bit FLAC file. Those were no problem for Brasero in
the first place.
The problem is about 24-bit FLAC files.
If you want to test with a 24-bit FLAC file, sox can easily convert
your 16-bit FLAC for you (but of course it won't sound any better than
the original 16-bit FLAC, but that doesn't matter for a simple test
like this):
sox -S <infile.flac> -3 <outfile.flac>
-S is the same as --show-progress. Not necessary in this case, but
it's always nice to know what's going on.
-3 means 3 bytes/sample for the output file (3×8 bits=24 bits).
Then try to burn <outfile.flac> as an audio CD with Brasero.
Kind regards
Johnny Rosenberg
ジョニー・ローゼンバーグ
> Num samples 9.96M
> Length s 225.791
> Scale max 1.000000
> Window s 0.050
>
>
>
> --
> Ioannis Vranos
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