Re: [SoX-users] .ogg to IMA-ADPCM .wav sounds horrible. Any ideas?

[Michael B. <mb...@hi...>]

Yes, it's very strange. I ended up using straight wav temporarily. Additionally I can manually convert all these in Audacity. There are just many of them and I want to do them in batch. I can't figure out the right parameters in the "Chains" feature of Audacity to do them in batch. :( 

---
Software Engineer
mb...@hi...



On Wednesday, December 19, 2012 at 11:09 AM, Ulrich Klauer wrote:

> Michael Bishop <mb...@hi... (mailto:mb...@hi...)>:
> 
> > I've got some .ogg files and am trying to convert them to .wav files 
> > (using IMA-ADPCM). When I do it in Audacity, it sounds fine, but 
> > through sox, it sounds horrible with a crackling in the right ear.
> > 
> 
> 
> > sox --norm=-3 music.ogg -e ima-adpcm music.wav
> 
> First, as a workaround, you could use the libsndfile driver, like this:
> sox --norm=-3 music.ogg -t sndfile -e ima-adpcm music.wav
> 
> 
> I was able to reproduce the problem, but it puzzles me. Here is what I did:
> - Take a stereo WAV PCM file. Convert into WAV with IMA-ADPCM. The 
> right channel has a crackling, the left channel is OK.
> - Read converted file from previous run with -t sndfile, to make sure 
> that it isn't a reading problem. Same observation (left channel OK, 
> right channel not).
> - Repeat the conversion, with "remix 1 2 2 1 2" added. Channels 2, 3, 
> 5 are affected, channels 1 and 4 are OK.
> - Retry with "remix 1 2 1 1 2". Only channels 2 and 5 are affected. 
> Conclude that the problem depends on the input.
> - Create another stereo WAV PCM file from the original input with 
> channels swapped. Convert into IMA-ADPCM with "remix 1 2 2 1 2". 
> Still, only channels 2, 3, 5 are affected, even though they now 
> contain the audio that was OK last time. Dismiss previous conclusion.
> - Create a five-channel WAV PCM file using "remix 1 2 2 1 2". Convert 
> to IMA-ADPCM. Same result (channels 2, 3, 5 affected).
> - ???
> 
> Ulrich
> 
> 
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