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Discussion Groups | Audio Signal Processing | Problem in decoding g729 audio samples

Technical discussions related to Audio Signal Processing (digital effects, acoustics, noise reduction, musical signal processing, etc).

  

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Problem in decoding g729 audio samples - krav...@gmail.com - Jun 13 10:24:40 2008



My aim is to dump the G.729 encoded audio samples packetized in RTP payload and then
convert the G.729 encoded samples to MP3 format.

What i'm doing:

1. I got the G.729 encoded audio samples from RTP payload and saved as  g729audio.ul on my
machine using my c programm.

2. I'm using SOX as my converter to convert g729audio.ul to audio.wav(wav format).
3. Then, i'm using bladeencoder to convert audio.wav to audio.mp3

But, when i try to playback audio.mp3 on windows m/c, the audio is scrumbled, i cant be able to
hear the voice conversation! 
could anyone tell me why the audio.mp3 is scramblled?

Thanks very much

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Re: Problem in decoding g729 audio samples - Grzegorz Kraszewski - Jun 13 21:15:14 2008

> 1. I got the G.729 encoded audio samples from RTP payload and saved as
>    g729audio.ul on my machine using my c programm.

> 2. I'm using SOX as my converter to convert g729audio.ul to
      audio.wav(wav format).

> 3. Then, i'm using bladeencoder to convert audio.wav to audio.mp3

> But, when i try to playback audio.mp3 on windows m/c, the audio is 
> scrumbled,

Does the WAVE file sound ok on Windows? If no, either your depacketizer or 
SOX have problem. If yes, verify settings of MP3 encoder or try another 
one.

-- 
Grzegorz Kraszewski <k...@teleinfo.pb.edu.pl>
http://teleinfo.pb.edu.pl/~krashan

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