Audio sync on avi after removing bad frames

[Feccy35]

Well, this is a first. For ages I have been removing bad frames on downloaded avi's with no problems. The I get One Hour Photo!

Once again, Vdub 1.4 logs bad frames & I manually remove them from the end to the start by deleting the appropriate segments between keyframes. Yes, both audio & video direct stream copy are switched on - as always.

Only this time, after the bad frames have been removed, the audio seems to remain as original!!

Then I carry on and convert to mpg using TMPGEnc. The only thing I notice now is that the avi source is 30 fps & I convert to 23.976 fps

Well, I tried to deal with the audio by keeping a note of the position & number of frames removed (at 30 fps), and working out the appropriate audio segment to be deleted(at 23.976) using GoldWeave to edit the extracted/de-multiplexed mp2 file. This is where the system has failed! For example, 1st bad segment was 444 frames (at 30 fps), so at 23.976 frames/second, this equates to 14.8 seconds, only the apparent audio 'slip' seems to be around 1 second (actually, nearer 0.8s). The total frame removal was 1608 = 53.6 seconds - this was confirmed by looking at the overall clip length before & after removing frames.

The frustrating thing is, there does not seem to be any correlation between frames removed & length of audio slip - or am I missing something. Approximate total audio slip is about 6 seconds.

Can anybody help before I tear my hair out!!

Fec

[wolleric]

NEVER delete corrupt frames. Mask them instead (select them with Selection Start/End, then Video/Mask selected frames). This way audio will go on while video will pause in the damaged part.