conversion slowly loosing sync

[Lord Balthazar]

All the "loss of sync" posts I've seen on here have been complete out of syncs, but mine is progressive. I downloaded a TV show, and the avi plays great, I riped the audio in VirtualDub and played the video back with the wave file as the audio and it played fine. But when I convert it with TMPEG it starts out in sync, but throughout the show the audio gets further and further behind the video. This is the only file that has done this, all my other conversions work fine. Any ideas on how to fix this? I'm trying to make it a VCD. I also tried looking for another copy of this file, but I can't seem to find one.

[narked]

sounds like your video has gone through the fps conversion but your sound hasn't e,g, converting from ntsc film to pal means compressing your video by 95.905%, but if your sound hasn't then after say an hour it will be 3 mins out (not exact figure, just thinking). Give more details of the steps taken. original fps, sound format hz etc and destination fps hz etc,

[Lord Balthazar]

well I downloaded the file off of Kazaa, and I'm not sure how to get all the info. Is there somewhere I can look that will tell me the info?

[narked]

Have u read the newbie guides on this site? If not I suggest u do so.
Anyway, open file an virtualdub, go to file - file info, will give all input data. Save wave as uncompressed wave. load back in. Check sync. Adjust as necessary in vb. Serve to TMPG. TMPG has all output data on bottom bar when working, also gives info on right hand side of wizard window when it starts. If you did save your sound to wave first at what freqency? ntsc plays in 48Mhz pal in 41Mhz......

[DivXExpert]

GSpot.exe gives info about a vid file. You could open it in VirtualDub and goto Framerate to see what it is. GSpot is fast though.

[Lord Balthazar]

How do I save the file as Uncompressed? All I see is Save Wave, but there are no options with that.

The file info is:

Video Stream

Frame size, fps - 352x240, 30.036 fps
# of frames (time): 38757 (21:30)
Decompresor: DivX MPEG-4 Low-Motion
Number of key frames: 631
Min/avg/max/total key frame size: 1261/8145/21923 (5020K)
Min/avg/max/total delta frame size: 45/2023/12483 (75355K)

Audio Stream

Sampling rate: 44100Hz
Channels: 2(Stereo)
Sample precision: 0-bit
Compression: Fraunhofer IIS MPEG Layer-3 Codec
Preloader Skew: 8000 samples (0.18s)
# of frames: 38741
Min/avg/max/total frame size: 47/532/8000 (20161K)

[EddyH]

That 30.036fps looks suspect...!
Should be 29.976. I'd say whoever capped the program had a cheap device such as an Iomega Buz. If you can, take the audio out to a wav file, speed it up (without conversion) from 44100 to 44188, and then convert/save back to 44100, see how that works.

Or re-encode the video back to 29.976 in virtual dub/TMPGEnc (with 'do not convert frame rate') might help, of course ignoring the warning about it causing sound to desynch!