Video with L/R tracks to DVD with 2 channel audio tracks

[Downloader]

I am looking to author a DVD from video files which have L/R tracks so that they will appear as 2 different audio tracks on the DVD. This is essentially a karaoke dvd. Is it possible? And will the audio tracks be in mono or stereo?

[guns1inger]

It is possible. The results will be mon, although you can create two channel mono if you wish.

Essentially what you need to do is load the original audio track, copy the left channel over the right channel to replace it, then save this as track one. Load the original audio track again, copy the right over the left to replace it, then save this new track as track two. You now have two new tracks in place of the original L/R track. You can encode and author with these instead of the original

[AlanHK]

You can easily do this in Audacity (version 1.3 with ffmpeg plugin).
Open the audio file (Audacity can also directly open audio in many video files).
When it shows the track (stereo, l&r), left-click on the name of the track and choose "split stereo to mono".
Then you can save each track separately.
Audacity can save directly to AC3 for DVD.
The tracks will be mono; identical sound will come out of both speakers.