Source sound disappeared

Lili wrote on 6/2/2005, 8:20 AM
I edited a video (V5) in which the source sound was dialogue and I added a music track. I rendered it in MPEG2, and as usual, all went well and it played back perfectly.

However, after I burned the DVD ( I checked the "include audio-sream" box when rendering) and played it back, the music track was audible but not the source dialogue track.

I've done quite a few videos with dialogue and music in the past with no problems. Does anyone have any idea what may have happenned and how to correct?

I use Neo DVD by Mediostream - (not to be confused with the popular Nero).

If no suggestions, I will try uninstalling and re-installing the software.

Thanks.
lili

Comments

Spot|DSE wrote on 6/2/2005, 8:29 AM
Did you add the music track as a secondary audio track? Or mix it with the dialog? If you rendered the audio as a single stream mixed with the dialog, it would be virtually impossible for the music to be heard and not the dialog.
Your post would suggest you rendered a separate music track and a separate dialog track. These can't be separate and play at the same time. You need an audio track that contains everything, then you can generate sub-audio tracks that act as alternate audio tracks. But only one can play at a time.
gordyboy wrote on 6/2/2005, 9:22 AM
Is the dialogue track mono or stereo? If stereo, and if it is out of phase with respect to the music track, in some circumstances, playback through a mono speaker can mean the dialog disappears due to phase cancellation.

I usually mono all dialog to be on the safe side.

gb
Lili wrote on 6/2/2005, 5:31 PM
Thanks for the replies. It was recorded in stereo and your (gordyboy) theory seems correct except that I can hear both music and dialogue when played back on the computer and it is up on the web and everyone who has looked at it can also hear both, even on a laptop that has mono sound.

The problem has to do with playing the DVD on the TV. I don't know how the sound can be heard everywhere else except on the tely. When I play the DVD on the computer I can here the dialogue OK but the music sounds terrible.

FYI - I did in fact render the 2 sound tracks and the video track together and not separately. When I rendered them for the web it was rendered in wmv and when I rendered it for the DVD I used MPEG2.

It must have something to do with the encoding then?
Spot|DSE wrote on 6/2/2005, 5:58 PM
No, it's not the encoding. If you can hear the dialog at all, it's likely a phasing issue.
In Vegas 4,5, 6, you can check this with the down mix button in the Master section of the Vegas mixer. Check your mix in mono, and if you hear the vox disappear, this is a phasing issue. I'd recommend doing just as gordyboy suggests, run your voice/dialog in mono.
Did you record with multiple mics in your cam? Or using an audio mix from a multiple mic source? Any plugs in your cam during recording?
Liam_Vegas wrote on 6/2/2005, 6:23 PM
Do you have music on one channel and dialog on another? I once had a client ask me to do a dub from a raw tape to DVD. I had the on-camera audio on CH1 and wirelss mic on CH2. Their DVD player was hooked up to a mono TV set and only the left (CH1) was hooked up. Result... they thought I had not recorded the dialog (wireless mic).

Of course... probably not your issue... but I'll metiion it anyway.
Lili wrote on 6/3/2005, 9:52 AM
Liam - you are right on! I checked the back of my TV set and one of the two hook-ups was plugged into the wrong place (mono). Needless to say I'm elated!

Thanks for all the replies - you guys are amazing.

lili