avi to svcd out of sync no matter what i do..

[kv2]

I'm using TMPGEnc to convert an avi file to an svcd but no matter what settings I use there's always heavy audio/video desync. I extracted the .wav file already using vdub. I also did the error checking and there were 0 errors. vdub also says the avi is 23.976 fps. I chose both NTSC and NTSC-Film from the wizard and none work. I set to CBR and VBR and choose auto so it auto-adjusts the bitrate to fill up 100% of the cd. I even chose just regular vcd mode (both NTSC and NTSC-Film) and they still do not become in sync. I don't think the bitrate matters with sync problems right? It's just the quality of the video. THe audio/video even messes up when I play on PowerDVD on my comp.

help? plz

[mats.hogberg]

heavy audio/video desync

There are 2 kinds:
1) The sync is out from start to finish. This may be caused by the a/v tracks in the AVI are interleaved with skew (most common the audio starts later than the video). When you extract the audio, this skew is lost, and when you put a+v together again (during encoding/multiplexing), making a+v start at the same time, desync is the result. If your encoder can handle the audio in the AVI without extracting the audio as WAV first, I suggest leaving it in the AVI, and use the AVI as audio source too. I know many sugget extracting the audio from the AVI as a cure for everyting and anything, but that in it self introduces new and interesting error sources.

2) The sync starts fine, but becomes gradually worse thruout the movie. Mostly this is caused by frame rate conversion. Only cure is to stretch/compress the audio to fit the new frame rate video playing time. In combination with 1), this can really be a pain to get right.

/Mats

[theDruid]

I agree with Mats - as usual.

However, if you've already got TMPGEnc, you might like to have a try at DVD2SVCD.

You can switch the software to accept avi as the source (it changes to AVI2SVCD when you do this).

It automates the whole process of creating your SVCDs - and it might well fix the sync problem.

It might not though!

cheers,
mcdruid.

[clanger]

When you loaded the AVI into VirtualDub, did it pop up a requester saying anything about the audio being in VBR format ?
I've had nothing but trouble with files like these, and can't ever seem to get them to sync again.
The films tend to be either divx or xvid avi's as sources.

[teegee420]

When you loaded the AVI into VirtualDub, did it pop up a requester saying anything about the audio being in VBR format ?
I've had nothing but trouble with files like these, and can't ever seem to get them to sync again.
The films tend to be either divx or xvid avi's as sources.

I've had this problem too and it's best to decompress the audio to wav form. Then under "audio" in Virtualdub just select "wav audio" and select your wav file. Takes me 10-20 minutes to create the wav but this cures the a/v sync issues everytime.