Gradual loss of sync

[varunb]

I have a tv capture that loses audio sync near the end. Its an avi file(Xvid, vbr mp3). I have tried goldwave's time-stretching but it didn't work. If any1 knows any method that works perfectly for problems like these, then pls let me know.

[olyteddy]

No expert here, but I've read that VBR can be troublesome. Can you de-mux the audio, convert to CBR and re-mux?

[varunb]

Demuxing & muxing as uncompressed wave was the 1st thing I tried. I even tried CBR but that didn't work out either. Any other suggestions ?

[paglamon]

Can you post Mediainfo of the file please? Preferably in Tree view.

[varunb]

---== Video stream ==---
Source : [Input AVI file]
Description : AVI video stream
Length : 00:43:29.816

---== Other stream ==---
Source : [Input AVI file]
Description : AVI audio stream 1 [tag 0x0055, MPEG-1 Layer 3 (MP3)]
Length : 00:43:29.784

[paglamon]

I wanted info from Mediainfo, not Virtualdub.

[varunb]

Sorry about that virtualdub info but I finally found the solution of my problem guyz. In my case, the audio was 0.310 seconds behind. So what I did was:

1.) demuxed VBR MP3 from the avi using virtualdubmod.
2.) Opened Goldwave, opened the mp3 file -> save as WAV.
3.) Opened WAV file (generated in previous step) -> Effect menu -> Playback rate -> 48003. (cos its 0.3
seconds behind)

4.) Again Effects menu -> Resample -> 48000.
5.) Saved as WAV with different filename(although u can overwrite but one must be sure before
overwriting)

Dats it. The audio is in perfect sync now.

[paglamon]

Yes.That's the way to do it with Virtualdub.
But I prefer AVIDemux for these vbr audio files.It builds the timestamp itself.
You can also try Virtualdub-MP3.