Remove one audio channel in avi files

[nucelar]

Hi there, I hope I can find some advice here, there seem to be very knowlegeable people in these forums.
So here's my problem. I have a bunch of avi files like this:

-------afreeCodecVT Video Report-------:

Streams (Header) : 2
Streams Found : 2
Length (s) : 2.977
Total Frames : 89.220
Resolution (Header) : 320 x 240
Flags : Has Index, Trust CK Type

Video Size (kB) : 436.971,92
Audio Size (kB) : 40.701,17


------- Video Stream -------

Codec : DivX 5.0
Flags : None Set
Quality : 0
bps : 1.202.443

FOURCC : DX50
Resolution : 320 x 240
FPS : 29,97
BPP : 24


------- Audio Stream -------

Codec : MPEG-1 Layer 3 (MP3)
Flags : None Set
Quality : 0
bps : 112.000

Codec Code : 85
Channels : 2
SamplePerSec : 48.000

-------:
I need to get rid of the left audio channel and end up with a mono sound equal to right channel. Video should be left untouched. So far my best attempt has been with VirtualDub, but it seems to reencode the audio (takes time...) instead of just deleting the left channel. Is there some app out there that does this without re-encoding? And ideally does Batch processing, too?

Thanks!!

[anonymez]

use BeLight to encode to 6 mono wavs. you'll end up with 6 files, since the source is stereo the audio should be in FL and FR, the rest will be silent. take the FL channel, encode back to mp3 and mux with virtualdub

an alternative, even further from being automated/batch, is the avisynth route, use getleftchannel() and feed into BeHappy