Error While Encoding Audio On VirtualDub

[ashwin.terminator]

I was creating a 1/3DvDrip of one of my DVDs... The Created file had the following attributes...

Video
ID                               : 0
Format                           : MPEG-4 Visual
Format profile                   : AdvancedSimple@L5
Format settings, BVOP            : Yes
Format settings, QPel            : No
Format settings, GMC             : No warppoints
Format settings, Matrix          : Default (H.263)
Codec ID                         : XVID
Codec ID/Hint                    : XviD
Duration                         : 2h 9mn
Bit rate                         : 1 158 Kbps
Width                            : 720 pixels
Height                           : 304 pixels
Display aspect ratio             : 2.35:1
Frame rate                       : 25.000 fps
Resolution                       : 24 bits
Colorimetry                      : 4:2:0
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.212
Stream size                      : 1.04 GiB (72%)
Writing library                  : XviD 1.2.1 (UTC 2008-12-04)

Audio
ID                               : 1
Format                           : AC-3
Format/Info                      : Audio Coding 3
Codec ID                         : 2000
Duration                         : 2h 9mn
Bit rate mode                    : Constant
Bit rate                         : 448 Kbps
Channel(s)                       : 6 channels
Channel positions                : Front: L C R, Surround: L R, LFE
Sampling rate                    : 48.0 KHz
Stream size                      : 414 MiB (28%)
Alignment                        : Aligned on interleaves
Interleave, duration             : 64 ms (1.60 video frames)
Interleave, preload duration     : 192 ms
Title                            : kaminey_mhc T80 3_2ch 448Kbps DELAY -49ms

But on trying to re-encode ar 448kbps using VirtualDub using the AC3 ACM Codec at 3/2Channels, I get the following error message:

But while using the same at 2 channels, I can get it to work... Anything more than 2 doesn't work..

With AviDemux, I can get the 6 channels, but at a maximum of 320 kbps... What am I doing wrong??

[ashwin.terminator]

well anyone??

[jagabo]

I'm pretty sure VirtualDub only handles stereo audio. You would have to set AC3 ACM to downmix to 2 channels.

[ashwin.terminator]

ooh...
and yeah any idea as to why AviDemux only supports AC3 upto 384 kbps?? Is there any way to get it to work at 448kbps??