speed up mp3

[Ivo Woltring]

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
appreciated.

#=============CODE==================
#! /bin/env python

import sys,os

def aplayer( name, codec='mp3', card=0, rate=1 ):
import pymedia.audio.acodec as acodec
import pymedia.audio.sound as sound
import time
try: cod=os.path.splitext(name)[ 1 ].lower()[1:]
except: cod=''
if cod: codec = cod
dec= acodec.Decoder( codec )
snds= sound.getODevices()
if card not in range( len( snds ) ):
raise 'Cannot play sound to non existent device %d out of %d' % ( card+
1, len( snds ) )
f= open( name, 'rb' )
snd= None
s= f.read( 50000 )
while len( s ):
r= dec.decode( s )
if snd== None:
print '-'*75
print 'Playing: %s' % os.path.basename(name)
print 'Opening sound with %d channels -> %s' % ( r.channels, snds[
card ][ 'name' ] )
print 'Orig sample rate: %s' % r.sample_rate
if rate<0: sr=r.sample_rate/abs(rate)
else: sr=r.sample_rate*rate
sr = int(sr)
print 'Play sample rate: %s' % sr
snd= sound.Output( sr, r.channels, sound.AFMT_S16_LE, card )
if r:
snd.play( r.data )

s= f.read( 512 )

while snd.isPlaying():
time.sleep( .05 )

# --------------------------------------------------------------------------
--------
# Play any compressed audio file
# http://pymedia.org/
if len( sys.argv )< 2 or len( sys.argv )> 3:
print "Usage: aplayer <filename> [ rate ]"
else:
i= 0
if len( sys.argv )== 3:
i= eval(sys.argv[ 2 ])
else: i=1
aplayer( sys.argv[ 1 ], rate=i )
#==================END CODE==============

 

[Dave Brueck]

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.

Really? For PC playback, on Windows at least there are plugins for WinAmp to do
this, and Windows Media Player (at least version 9 at later) support this out of
the box. For MP3 devices, I know for sure at least one model from Creative
supports the faster playback - I can find the specific model if you need.

-Dave

 

[Ivo Woltring]

Thanks
No it is meant for normal devices so resampling (re-coding) is nessesary.
He doesn't want to buy special stuff to make things work.

Ivo