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Lame WAV encode generates Static
lukekb
post Oct 11 2013, 18:27
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Any ideas why certain WAV files might end up generating static when converted to mp3 files? I am using the --preset voice flag, but I have tried a number of different settings. The wav files are being recorded off the Wash DC radio system and are generated automatically. It generally works, but every now and then the resulting mp3 is just static.

Here is a sample .wav that plays fine, but generates static when run through LAME. Is the header corrupt or something?

http://robotastic.com/35664-1381511239.wav

Also - any setting recommendations for encoding 8kpbs mono 16-bit voice? Extra challenge, it was already encoded/decoded using the IMBE codec.
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saratoga
post Oct 11 2013, 18:32
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Can you post the lame command line or settings you're using exactly?
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binaryhermit
post Oct 11 2013, 18:45
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Well, I did a simple lame -V 2 and it worked for me. LAME 3.99.5. Perhaps your player doesn't like mono 8 kHz files.
EDIT: And --preset voice works fine for me too.

This post has been edited by binaryhermit: Oct 11 2013, 18:47
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testyou
post Oct 11 2013, 19:35
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Works fine for me too, and also Speex.
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db1989
post Oct 11 2013, 19:38
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Which version and packaging format (executable, DLL, etc.) of LAME?
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lukekb
post Oct 11 2013, 19:39
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QUOTE (binaryhermit @ Oct 11 2013, 19:45) *
Well, I did a simple lame -V 2 and it worked for me. LAME 3.99.5. Perhaps your player doesn't like mono 8 kHz files.
EDIT: And --preset voice works fine for me too.


You guys are totally right - I was using aplay and it didn't like any of the 8khz mp3 files. I was playing the successful files through a webplayer. This was all kicked off by FFProbe puking on some files. Sorry for the confusion!!!


On a related note, is '--preset voice' the best setting to be using? Should I use a constant bit-rate setting instead? I think the CBR encoded audio might sound a little less muffled. It is transcoded to a low bit rate to start with, so that might be messing up the ABR/VBR.
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