Sound Sync Problem

[tentest]

I am fairly new to all this. I use virtualdub and tmpg to convert divx and xvid to vcd. The trouble I'm having id that every now and then the audio gets out of sync with the video portion on the final vcd.
Any ideas or is this "normal"?

[bugster]

I am fairly new to all this. I use virtualdub and tmpg to convert divx and xvid to vcd. The trouble I'm having id that every now and then the audio gets out of sync with the video portion on the final vcd.
Any ideas or is this "normal"?

Its not exactly normal but it is quite a common problem.
Firts thing I would check is that the source avi and the final mpeg file are the same framerate. Divx movies downloaded from the internet tend to be mostly 23.976 fps which is NTSC film framerate, a few are 25fps which is PAL framerate and occasionally you get some with rather odd framrates like 14 or 20fps. Check the framrate of the avi in virtualdub and then encode with Tmpgenc using the appropriate template.

[Italian]

how do u check the frame rate of the original avi and the converted?

[rodonoghue]

i had a problem with this until reading somewhere on the forums that running the avi through avifixed before you try to convert to mpg(you can get it from divxdigest.com). I tried converting a divx about 10 times using different things but tried this on the 11th attempt and it worked first time.

[tentest]

Thanks for the response! I have checked the frame rates with virtual dub and have matched it with the proper template in TMPG. The frame rate of most seems to be 23,976 so I match it the closest NTSCfilm 23,970. I'll try the Avi Fixed suggestion and let you know how that works.
Again thanks!

[Italian]

i have checked the frame rate of my movie in virtual dub and it was like 93. somethin..and im making a dvd which the frame rate has to be 97 somethin..i saved a new avi using virtual dub changing the frame rate...but the sound still lags behind the video..does anyone kno how i can fix this?

[matneaves]

23.976 = ntsc film
29.970 = ntsc

mpeg 2 encoding will never be 239.976 somehow, so the closest will have to be 29.970

[honorarybrutha]

use virtualdub mp3. read the guide on how to remove bad frames and do so. install odio dekoda. then use tmpgenc to encode your repaired file.

[ching0]

most videos you're gonna find are made using gordian knot because its easy and it runs everytihng in batch.
it also creates a VBR-mp3.
what that means, is that for parts where there arent a lot of noise, it'll drop the bitrate to like 96 or lower, and more noise is up to like 128 or 160. this makes the audio file smaller.

if it has vbr, when you run it through tmpegenc, it'll get out of sync right about where there's not a lot of noise, if you noticed.

what i do, is save the wav outta the video with nandub, get CDex from sourceforge.net and in cdex, in a dropdown option at the top, you'll see 'strip riff-wav header'. do that to the wave you extracted in nandub. then, you'll notice it becomes an mp3. in cdex, again, go to 'convert compressed audio to wav' and save it as a wav.

now you can rejoin the wav which is about a gig to the video in virtual dub, but make sure you do direct stream copy for video and audio. if you're running outta HD convert the audio to CBR mp3.

now, virtualdub's crappy audio converter wont screw up because the audio is already uncompressed.