gnomebaker

[Johnny Rosenberg]

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