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Hydrogenaudio Forums > Lossy Audio Compression > MP3 > MP3 - Tech
vize84
I've got a problem when I try to encode CD tracks to MONO mp3s with this command
"-b 128 -m m" (it happens with every bitrate I choose, not only with 128), with it my MP3s have half the speed of the original track and obviously their length is twice the length of the original track. This problem occurs only when I use the command line with programs like audiograbber, but when I use the dll inside the program everything works fine...
Can anybody help me?
magic75
You could try using -a

My theory is based on this:
QUOTE
=======================================================================
downmix
=======================================================================
-a 

mix the stereo input file to mono and encode as mono. 

This option is only needed in the case of raw PCM stereo input
(because LAME cannot determine the number of channels in the input file).
To encode a stereo PCM input file as mono, use "lame -m s -a"

For WAV and AIFF input files, using "-m m" will always produce a
mono .mp3 file from both mono and stereo input.

Maybe Audiograbber stores the ripped audio as raw PCM?
Oge_user
QUOTE(vize84 @ Sep 10 2003, 04:36 PM)
I've got a problem when I try to encode CD tracks to MONO mp3s with this command
"-b 128 -m m" (it happens with every bitrate I choose, not only with 128), with it my MP3s have half the speed of the original track and obviously their length is twice the length of the original track. This problem occurs only when I use the command line with programs like audiograbber, but when I use the dll inside the program everything works fine...
Can anybody help me?

Try RazorLame and see if the problem is still here.. Audiograbber is far by the best wink.gif
getID3()
Probably unrelated, but if you try and encode a mono CBR mp2 with MP2enc it has the same problem.
vize84
biggrin.gif Thanks to magic75, with your settings everything works fine!
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