Audio sync problems splitting a in sync file

[Harry7357]

I download a movie from time to time that plays perfect on the computer, but is to large to burn to a VCD. I use the tools virtualdub to extract the audio to a wave and TMPGEnc to make two files from the wave and video file. For some of the movies the audio is badly out of sync, while for some, it works great. For one that is causing problems, I get an error in virtualdub that a improper VBR encoding was used and to extract the audio to uncompressed wave and put it back. I tried that, and the file I make is out of sync while the original one is in sync, but just to big to but on a VCD.
Can anyone give some tips?
Thanks!
:confused:

[dani82]

i confuse; if its out of sync, why would you burn it to a vcd.

if its a divx (or a not compliant mpeg), just use tmpgenc to convert both audio and video to vcd format, that should solve the sync problem, if you can't fit it to 1 cd then try 2.

[Harry7357]

Let me try and clearify a little. The movie file I have is in sync. Audio and video match perfect, but is to big to put onto a single VCD, so I need to cut it in two. It is after I cut the file into two smaller files, that those new files are quite a bit out of sync. I play the new files to check them before I burn them, so I have not made VCDs out of them due to the fact they are out of sync.
I cut them using virtualdub to get the wave, and use TMPGen, using the original movie for the video, and the wave for audio and set the start and end points to make the files. That usually works great for most of the movies I download, but there are a few that are in sync, but fall out of sync when split using the same method.

Harry

[dani82]

why don't you just uses the cutting tool in tmpgenc to cut the movie in half.

[htc10825]

to keep the AV syncron you'd better use M1-Edit Pro or M2-Edit Pro.
If that not available, try to reencode the modified .wav(in a wave editor like CoolEdit or Wavelab to cut/add a little to the result with audio delay = 0 ms) or direct cut the demuxed audio track in freeware "headAC3he" or "MP3DirectCut"(if possible: thay cann't add a gap of silice so far, only delete a gap).

To find out the actual delay of audio for mpeg-1 file is not very easy(DVD2AVI loads only mpeg-2 file). Use M2-Edit Pro you can get this info directly. Or try to decode the audio & video 2-5 min. from the begining then load them in VDub to find out the gap btw. A&V.

[Harry7357]

Thanks to all who gave me some pointers...Well, that problem movie is a Divx Avi that uses VBR, that it seems virtual dub doesn't like. When I tried to convert it from Avi to Mpg to try some other tools, I got error about the audio being compressed.
The time it is taking to mess with the thing, I think I will just use my audio/video out on my computer and record it onto video tape.
There probably is a way, but I don't know it. Thanks everyone for your help!

Harry

[htc10825]

0. start Vdub new
1. load the avi file to VDub
2. select menu "audio"/"full proccessing"
3. select menu "file" / "save wave"
you get a uncompressed .wav file.
4. select menu "audio"/"wave source"
choice the .wav file
5. select menu "audio"/"direct stream copy"
6. select menu "audio"/"Interleaving"
adjust the delay (+xxxx ms or -xxxx ms) and check the syncron of A/V by playing back the .avi
7. repeat step 6 till the A/V syncron.
8. select menu "file" / "save wave"
you get a perfect syncroned .wav file(audio delay = 0 ms).

Then you can load the .avi file and the .wav file to TMPG to encode them to a vcd file. You can split this file without problem.

Or better: save the .avi file in two parts after above step 8 in VDub:
9. select menu "Video"/"direct stream copy"
10. make selection in VDub for 1st part
11. select menu "file" / "save avi"
the first part is done
12. make selection in VDub for 2nd part
13. select menu "file" / "save avi"
the 2nd part is done.

Then you can load the .avi files to TMPG separately to encode them
to 2 vcd files.