VOB with mp2 audio - avisynth giving me only one channel

[pooksahib]

Hi. To date, any DVD that I've used MEGUI's 'File Indexer'on has given me an ac3 audio file. Today, I got an mp2 file plus a d2a file so, after some googling, changed my script as follows:

LoadPlugin("E:\MeGUI\tools\avisynth_plugin\NicAudi o.dll")
LoadPlugin("E:\MeGUI\tools\dgindex\DGDecode.dll")
a=DGDecode_mpeg2source("E:\test.d2v")
#b=NicAC3Source("E:\test Tc0 L2 mono 48 96 DELAY 0ms.mp2") #(my usual script)
b=NicMPG123Source("E:\test Tc0 L2 mono 48 96 DELAY 0ms.mp2")
audiodub(a,b)

The file created with this has audio in one channel only. I appreciate it says 'mono' in the title of the mp2 file but when I open the VOB in an audio editor there ARE two channels.

Am I scripting the audio correctly? Thanks.

[jagabo]

Are you sure your audio editor isn't set up for stereo editing and it didn't just applythe mono track to both channels? Do both channels look the same in the editor? When the editor plays them is there a difference between the two channels? Open the mp2 file directly and see what happens. What does MediaInfo say about the mp2 file and the original VOB file?

[pooksahib]

Hi jagabo. An odd one, this. I trust my Wavepad (up til now, anyway) to tell me if a file has one or two channels. I've seen it show 'one channel' many times. With this file (whether the original VOB or the equivalent made with VOV2MPG) it shows two. Both identical. The mp2 opens as one channel. mediainfo says VOB, mp2 and VOB2MPG are one channel. So I have to accept that it is. Must be a fluke of Wavepad. But I can easily make a 2-channel audio.

I take it my script is fine for mp2? Thanks for your time

[Brad]

And the VOB contains only one audio track, yes?

[pooksahib]

According to mediainfo and mkvtoolnix, yes. Although Wavepad shows two identical channels. Since my last post, I demuxed the audio with toolnix and Wavepad opens the resultant file as a single channel. As I said, must be a fluke of some sort that it gives two channels to the VOB. Not a big deal, though.