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Radio 3 test FLAC stream



 
 
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Old April 14th 17, 04:36 PM posted to uk.comp.os.linux,uk.rec.audio
Jim Lesurf[_2_]
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Default Radio 3 test FLAC stream

In article , Andy
Furniss spam@spam wrote:
Jim Lesurf wrote:

[snip]

With the caveat that I have no ides what distros do, assuming here that
there is nothing like ntpd running or ntpd -q via cron changing the time.


If your time is roughly right before starting a recording you could just
as root/sudo do something like


date --set '-1 minute'


then set it back +1 minute after it's finished.


Thanks, I'll experiment with that at some point. :-)

I've cross-referenced this to uk.rec.audio as it may interest people there
as well at this point. I've just put up some *preliminary* results

http://jcgl.orpheusweb.co.uk/temp/in...lacresults.png

The upper graph shows the audio levels (peak power in each 0.1 sec block)
over a period in the evening of the 10th April, taken from the test R3 flac
stream.

Sample-by-sample I subtracted this from the equivalent 320k aac version.
The resulting set of sample 'difference' values is shown in the lower
graph. Again peak value per 0.1 sec block.

This probably overstates the level of the difference between aac and flac
as it is a peak per block. But the result is fairly consistent. I can
certainly *hear* the results if I play the 'diff' file.

Need to do more when I have more data. But interesting as indicating that
the flac does show different/better results than the aac.

Jim

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