Audio on only left channel, want to copy to right for 2-channel mono

[aikox2]

Let me preface this by saying I am a beginner when it comes to video authoring; my experience has mainly been using TMPGEnc DVD Author to reauthor DVDs and add menus and chapters.

I have a concert DVD (VIDEO_TS Folder with VOB files), and the audio is only on one channel, so I want to copy it to the second channel and reauthor the DVD.

I know I have to demux, fix the audio, remux, then author, but I don't know the best way and best tools to do this.

I tried using DVDDecrypter to demux, and Womble to fix the audio, and I got the audio on both channels, but the final remux was out of sync : (

Any advice or help would be greatly appreciated.

Thanks,
Aiko

[hf]

You can use the freeware program audicity to duplicate
the one channel to get stereo. You can get the program
from http://audacity.sourceforge.net

[aikox2]

Thanks for the reply, but Audacity appears to be a basic sound editor, like CoolEdit.

I need to know how to seperate the AC3 audio from the MPEG off this DVD, then fix the sound problem, then remux the two so I can reauthot the DVD.

This program may be useful at some point, but I think I need more info than just the link to Audacity.

Anyone else that can offer more detail?

Thanks,
Aiko

[jshumate]

It's not very hard. Here's what you do.
1) Rip the AC3 audio track off the DVD.
2) Convert it to a wave file using BeSweet. I recommend using BeSweetGUI, which is a nice GUI front end to BeSweet. If you feel really lucky I think it would be possible to directly convert the AC3 file to a mono WAV file.
3) If you can't conver it to a mono WAV file but can convert it to a stereo WAV file, use an audio editor of some kind next. I use CoolEdit's Batch File Convert function for this kind of thing. In your input, select 100% of the left channel and 0% of the right. Send it out to a mono WAV file.
4) Use the mono WAV file you get in 3 or 4 as input to some kind of AC3 encoder (BeSweet can do this if you want, but non-free encoders are usually better). Either produce a 1 channel AC3 file (1.0 in AC3 talk) or a 2.0 stereo file using the same left channel mono WAV file as input to both channels.
5) Remux and author.

[aikox2]

Thanks for the info. I was ultimately able to resolve the issue by demuxing with SmartRipper (instead of Decrypter). The resultant files were easily fixed and remuxed with Womble. In fact, after I fixed this DVD, I went ahead and fixed another with a serious sync issue using the same tools.

Thanks again,
Aiko