Audio and video out of time, please help!

[LynzUk]

Hi, im new to all this but managed to convert a .avi file into mpg using TMPGEnc and then burnt it using nero into a vcd. I have a compatable dvd player to play VCD's however after 16minutes, the screen gets pixelated and it looses synch between the images and the sound by quite a large degree . how can it be fixed? i no longer have the .avi or mpg files on my computer just the vcd disks, please help me fix it!!

[mats.hogberg]

Can't be done (with any reasonable amount of work).
This is most likely caused by bad frames in the original AVI, and should have been corrected before encoding to mpeg. With no AVI, you're pretty much f*cked.

/Mats

[pixel]

This was probably caused by using VD without locking the audio to video, and when the pixelation occurs a lot of frames would have been dropped and the audio has continued at its normal rate.

I'm guessing the audio stays out of sync at a steady pace (ie. it doesn't move more out of sync at any place.)

What you can do if you are very desperate is copy the video file to your PC. (Use VCDeasy to exract)

Use the cutting function in TMPGEnc to cut the video just after the pixelation point.

Open up the out-of-sync part of the video in TMPGEnc, and when you get to source range adjust the audio timing to get it in sync (this may take a few tries, so do a sample clip of about 1min each time).

After it is encoded, join the newly encoded in-sync part back to the original first part.

Burn the VCD again.

You can find guides for all of the above programs by searching in the guides section.

Hope you can fix your problem.

[tyders]

Hi,

I have come accros this problem. My video is ahead of the audio by about 2 secs. When you say open teh file in tmpgenc and adjust the audio how do i do this?

I have looked at the guides and into tmpgenc but cant figure it out.

I assume another way to do it would be to cut out a few secs from teh audio? wil this cause problems?

[pixel]

Cutting audio could cause problems at the start or end of the movie if it isn't done properly.

In TMPGEnc, follow the project wizard till you get to the screen that has the options like "source range", "crop video" etc.
Go into the source range and a small window with a video and an audio wave should appear there.
There will be a small box that says something like "audio adjust", type in here a positive number if the audio is lagging behind (probably about 120ms for you) or a negative number if the audio is too far ahead.

To open the file in TMPGEnc it has to be AVI or MPEG1, or for MPEG2 you need an MPEG2 decoder. This way you have to re-encode the whole movie.

If you can not wait to encode the whole video, try demultiplexing the audio and video, saving the audio as a waveform in TMPGEnc, opening the file in an audio editor and cut out how much you need, or insert how much silence you need to keep it in sync, then open it in TMPGEnc again, encode to MPEG2 audio, and multiplex back together. This is the most difficult way so try it only if you have a lot of skill with audio editing programs.

[cephus]

I have a similar problem on a number of avi files, most of them Xvid or DiVX 5.0.

I strip the audio to WAV in VirtualDUB using full processing in the case of VBR problems. The video is 29.70fps, everything is correct in TMPGEnc as far as I can determine and it runs successfully to convert.

When viewing, the audio syncs properly for the first 20 minutes or so, then you start to notice a slight desync that gets worse until at the end, it's perhaps 1200ms out of sync.

This seems to happen irregularly. One 29.70fps Xvid file will work fine while another with the exact same codecs will not. All of the avis work perfectly throughout.

Any ideas for correcting the sync drift?

[ZippyP.]

Any ideas for correcting the sync drift?

Scan for bad frames first.

[cephus]

Any ideas for correcting the sync drift?

Scan for bad frames first.

Checked that, no bad frames. VirtualDUB reads it beautifully and plays the original copy with no problems or drift. It's only after I strip the audio to WAV and run it through TMPGEnc that I get drift.