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Subject: render xvid avi with ac-3 dolby digital sound
Posted by: dyer010
Date: 8/19/2004 8:17:45 PM

i have been trying to render a mpeg 2 video to xvid avi using ac-3 audio decompression but every time i try i get an error message that says can not open codec. but i can render a mpeg 2 video to a xvid avi using PCM uncompressed. can any one help me make the xvid conversion with dolby digital sound

Subject: RE: render xvid avi with ac-3 dolby digital sound
Reply by: Neil Wilkes
Date: 8/23/2004 4:34:12 AM

What are you attempting to do, exactly?
If the Video has MPG-1 layer 2 sound, which is probably the case, you are going to take a huge quality hit if you attempt to encodethis as Dolby Digital.
What has to happen for this to work is this.
Uncompress from MPG audio to PCM, re encode as Dolby Digital.
So what is going on is you are unpacking a lossy compressed codec into WAV, with all the missing frequencies still missing, then attempting to re encode to yet another lossy format?
Why?

Subject: RE: render xvid avi with ac-3 dolby digital sound
Reply by: dyer010
Date: 8/23/2004 1:45:18 PM

i am a rookie to vegas all i have been trying to do is learn how to incorporate dolby digital sound into all of my video and render them into divx or xvid, need help also could you tell me how to recode PCM audio to AC-3 as you stated in the prior message

Subject: RE: render xvid avi with ac-3 dolby digital sound
Reply by: Neil Wilkes
Date: 9/5/2004 4:37:36 AM

You cannot incorporate Dolby Digital (AC3) into DivX.
Or Xvid.
It multiplexes into MPEG-2, not this other format.
Sorry.

PCM to Dolby Digital is easy - all you need is a Dolby Digital Encoder.

Can you explain just what you have, and what you are trying to do?
Going from one compressed format to another is going to drop the quality - noticeably.

Subject: RE: render xvid avi with ac-3 dolby digital sound
Reply by: BJ_M
Date: 9/13/2004 2:45:12 PM

Wilkes - you are wrong, you can multiplex ac3 into DiVX and XVID and many other types of avi files -- even DV ....

just create the two files (avi type X and ac3) and multiplex them together in virtualdub ...

btw -- vegas is not the best xvid encoder as it does not handle 2 pass xvid encoding ...

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