Strange problem when cutting AVI

[mikeveli]

Hey all,

I'm experiencing a strange problem when attempting to cut an AVI using VirtualDub. I set up the mark in/mark out points as usual and proceeding to save two avi files which cut the original in half. However, for some reason when I viewed the files afterwards, the 1st AVI crossed over to where the 2nd one was supposed to start and the 2nd one contained frames that were to be at the end of the 1st AVI. So I was getting an overlap in frames, but I could see no logical reason why.

When cutting the AVI files, my first mark in point was at the beginning of the original and the end point was for arguments sake at frame 50. I saved this avi and then set the mark in point at frame 51 and the end point at 100 and saved that AVI. When I view the AVIs, AVI1 has 60 frames and AVI2 has 60 frames, not 50 like they were originally supposed to have because each has 10 frames from the counterpart AVI. (There aren't the real numbers by the way, this is just helping me to explain my problem )

Any suggestions on how to fix this or another way to go about cutting AVIs?

Mikeveli

P.S. The files encoded using a DivX codec.

[bugster]

Hey all,


P.S. The files encoded using a DivX codec.

AFAIK, virtualdub will only cut on I-Frames. In a divx I frames can be quite a long way apart. (several seconds). Either use the virtualdub function to advance/rewind to the nearest I-Frame when choosing your cut point, or live with it as it is.

[mikeveli]

Thanks for the reply,

Is there another program that cuts at specific frames besides having to re-encode the whole thing in something like Premiere? Also, is it possible to change the positions of the I-Frames in the DivX so that they appear on the frames I want to cut?

Mikeveli

[bugster]

Thanks for the reply,

Is there another program that cuts at specific frames besides having to re-encode the whole thing in something like Premiere?
Mikeveli

Not that I am aware of.

Also, is it possible to change the positions of the I-Frames in the DivX so that they appear on the frames I want to cut?

When you encode the divx, you can set the frequency of I-Frames. More I-Frames equals a bigger file (or higher bitrate required for same quality). After encode, it cannot be changed except by re-encode.