Sound encoding

ChristerTX wrote on 11/19/2003, 8:55 AM

This might eb alittle outside this forum, but I'll try anyway.

When I played my created DVD, I could only hear the background music that I added for the initial titles. When the movie started I could not hear the dialogue and sound from the movie.

It has something to do with how the sound is encoded on the DVD.
When I change the sound settings on my receiver I can get the sound to work.

Can someone advice on how the sound is encoded on the rendered MPEG?

Comments

IanG wrote on 11/19/2003, 2:44 PM

Supported formats for DVD depend on whether you're working with PAL or NTSC - if it's PAL you can use MPA or AC3, NTSC should be PCM (WAV) or AC3. Although MPA isn't supported under NTSC, that doesn't mean it wont work - a lot of modern players are ok with it.

As to what happened to your DVD, my guess would be that you used different audio formats for your main movie and titles - that can cause all sorts of problems.

>When I change the sound settings on my receiver I can get the sound to work.
What changes do you make?

Ian G.

ChristerTX wrote on 11/19/2003, 4:21 PM

Thanks,
This is an interesting topic. I'm doing this in NTSC.
My old receiver did not have any decoding, so the DVD player decoded the sound and everythin worked well.

Now on the new receiver, I have a digital bit stream from the DVD player and the bit stream is decoded in the receiver.
The receiver is set to automatically choose how decode to decode the bit stream. My guess is that the music that the DVD is in AC3 format and is decoded properly.
I have to check what decoding I had to switch to in order to get the sound for the movie soundtrack to come trough.

My guess is that the receivers decoder can not switch from AC3 to PCM if the bit stream changes from AC3 to PCM.

The question is, is there an option somewhere in Screenblast that says what format the sound should have.

IanG wrote on 11/19/2003, 4:52 PM

This is the description of the DVD NTSC template from VF - "Use this setting to create an MPEG-2 file with an NTSC DVD-compliant video stream, and an MPEG layer 2 audio stream." Note that the video stream is described as DVD-compliant, the audio isn't!

Ian G.

ChristerTX wrote on 11/20/2003, 2:12 PM

Hmm,
I checked the setting on my receiver and the setting that worked for the sound on the movie soundtrack was 2Ch Analog.
That completely bypasses the sound field manipulations in the receiver.
So it sounds like what ever sound coding was on the sound track on my DVD, it did not go out on the digital bit stream to my amp. It was only present on the analog connection.