encoding ulaw wav to pcm wav format

2006-05-15 17:53:07

how would i encode a ulaw wav to pcm wav format using LAME command line?

encoding ulaw wav to pcm wav format

Reply #1 – 2006-05-15 18:17:19

I don't think LAME can decode µ-law. You can probably use foobar2000 or the windows sound recorder to decode it to PCM, though.

encoding ulaw wav to pcm wav format

Reply #2 – 2006-05-16 07:14:58

You can use SoX for that.

encoding ulaw wav to pcm wav format

Reply #3 – 2006-05-18 14:10:26

i used winlame and it worked perfect. but i need a command line version...


lame -m m -r -s 8 --decode sample.wav works but the sample is noisy... although when i do the decoding in winlame the sample is clear.

encoding ulaw wav to pcm wav format

Reply #4 – 2006-05-18 15:19:39

okay so i have downloaded sox and so far i am not certain how to speciffy that i want to convert from a wav ulaw to a wav pcm... it doesnt have anywhere to specify format other than uw and wav... options which dont work for a wav file which is ulaw format and not ulaw filetype...

encoding ulaw wav to pcm wav format

Reply #5 – 2006-05-18 15:29:56

actually the option is -s for signed.

encoding ulaw wav to pcm wav format

Reply #6 – 2006-05-18 16:52:45

the only problem now is the bitrate... how do i control the bitrate w/ sox?

encoding ulaw wav to pcm wav format

Reply #7 – 2006-05-19 17:38:21

-b = 8bit
-w = 16bit
-l = 32bit
-d = 64bit

It's all in the docs.

encoding ulaw wav to pcm wav format

Reply #8 – 2006-05-19 22:34:18

thats for audio sample size. id like the bitrate of the ouptut file to be 128kbps and i dont see that anywhere any the documentation... although it may be there maybe i am searching for the wrong term?

encoding ulaw wav to pcm wav format

Reply #9 – 2006-05-19 23:45:29

You don't set bitrate for PCM - it's defined by its parameters (sample-rate, bits-per-sample, and number of channels).