Thanks a lot for your continued assistance.
The movie is a home video taken on my Sony Handycam and recorded on a Memorex Mini-DVD (-RW).
I normally just copy these Mini-DVD's to another DVD using Roxio and they are fine to play on my DVD player etc.
However, this mini-DVD was quite badly scratched and it wouldn't read it so I looked around for some utility that could possibly recover the movie. It had something like 36 chapters (approx 27 minutes). I found IsoBuster and this did the job. It recovered the file (all but the last 2 or 3 chapters) so I ended up with approx 25 minutes of my original movie. So I have a VTS_1 file which is .99GB in size.
I don't remember changing the quality setting from what I assume would be the default. Yes it is PAL setting. The final project seems to have created just one chapter covering the whole 25 mins....i.e. no chapters as per the original. I also created the project with an Intro screen per MyDVD with a default music.
How it works in Preview?... perfectly would be the answer. The intro comes up fine followed by the whole video. The intro has the music; the video has the audio as originally recorded.
When I burn it, I end up with a DVD that on both my PC DVD player and on my home DVD player has the Intro with sound but the whole video without sound. I've used DVD-R and DVD-RW....same result.
Hope the above is helpful.....anything else I can tell you?