Hey all,

what switches might I need to decode a regular ol'
44.1 khz
128 kbps
stereo
mp3

to a
8000 khz
64 kbps
8 bit
monophonic 8 bit pcm wav file?

I've read guides and tried a bunch of different settings in both all2lame and in a regular cmd prompt in windows xp.

any ideas?

thanks,

jordan

I don't think LAME supports resampling and downmixing on the decoder side of things - only in the encoding.

If I were you, I'd use foobar2000 and put the MP3 file(s) in the playlist.

Select the files you want to convert then right-click and use Convert... to save as a WAV PCM file.

In the Convert... More Settings choose WAV as the encoding preset.

Select the DSP Processing and click on ... for the settings. First move "Downmix channels to mono" to the left pane, then "Resampler (PPHS)" and Configure Selected on the latter, to choose 8000 for the sampling rate. Click OK.
Under "More Settings..." in Output choose preferred bit depth to be 8 bits and select Dither as you wish (typically "Lossy Sources Only").

At 8000 Hz sampling rate, there's little point in worrying about whether or not you use noise-shaped dither as the added noise cannot be hidden much in less-audible frequencies because only frequencies up to 4000 Hz can be reproduced. Just be sure to enable dither.