speed up mp3
jbors at mail.ru
Tue Oct 26 22:40:34 CEST 2004
From: "Ivo Woltring" <TheDolphin at ivonet.nl>
To: python-list at python.org
Date: Tue, 26 Oct 2004 21:16:31 +0200
Subject: speed up mp3
> Dear Pythoneers,
> I have a blind friend who listens a lot to audio books. A lot of the
> material available today is in mp3 format.
> For ages i have been looking for a mp3-player with speed control and haven't
> found any.
> Next option: write one yourself.
> And I have ;-). with the PyMedia module.
> It is an only sleightly adjusted version of one of the examples.
> Now the Question:
> Is it possible to re-Encode mp3 files with this faster speed as to make them
> portable to e.g. Pocket PC (without python interpreter) or standard MP3
> player (hardware)?
> The files have to play at about 1.5 times the normal speed.
> I tried it with PyMedia but I only get errors. Any help would be
You cannot directly play sound at the sample rate you want. Soundcards supports only fixed sample rates.
Here is the example that works with resampler:
( from aplayer.py )
print 'Opening sound with %d channels -> %s' % ( r.channels, snds[ card ][ 'name' ] )
snd= sound.Output( r.sample_rate, r.channels, sound.AFMT_S16_LE, card )
resampler= sound.Resampler( (r.sample_rate,r.channels), (r.sample_rate/1.5,r.channels) )
data= resampler.resample( r.data )
snd.play( data )
Unfortunately there is a bug in current resample() which makes holes in the sound. I have fixed that and it will be in release 220.127.116.11 next week.
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