2 Disc Movie and AC3

I am backing up a 2 Disc movie, and at the beginning of the second disc, there is a few seconds of black space, along with a bit of junk I need to crop out. Now I could encode the video, then use VDubMod to mux the video/audio, and just delete the part I don't want. However, I don't use VDubMod to mux AC3, as I am told that AVIMux is vastly superior in this respect. 1. Should I just use VDubMod? 2. Is VDubMod actually BAD for AC3 muxing, or is it just that AVIMux is perfect? 3. Is there any way to crop video and audio out while still using AVIMux to mux? I've tried editing the beginning .vob on the second disc so that the few "empty seconds" don't appear, but then the audio disapeared, (I used Chopper XP). If I just crop out that part of the video (using avisynth or Virtualdub or whatever), that still leaves the AC3 audio needing to be cropped. Is there some program that you can use to crop a specific amount of time from an AC3 file? I know the answer is probably really, stupid simple. It's probably sitting right in front of me. But this is driving me insane.

I'm not so sure if this will work for you but when I encoded FOTR:EE I followed some info I found here on the forum. There was a certain amount of black frames at the end of the first disc and at the beginning of the second. I loaded all vobs from both discs into dvd2avi and demuxed the ac3. When encoding the video I trimmed the black frames (25 in total) in avisynth. Muxing the resultant video file and the demuxed ac3 resulted in audio that was in sync all the way through. I figure there was no silence added in either ac3 track for the black frames so they were joined seamlessly in dvd2avi. Hopefully this may work for your movie.

I confirm what theReal said, AC3 muxing is absolutely no problem in VDM. I use 96ms/96ms though. Guess just another working solution ;) Anyway, it's ve~ry simple, you encode normally without cutting anything, nor touch the ac3. Then you open your avi in VDM, load the ac3, make the right preload/interleaving/delay settings, mark the range you wanna have (go to the first frame that should be included, click on /_ then go to the last... bla bla bla), it will be marked blue, save it, that's it.

All right, I'll try vdubmod. It's just that AVIMux works so well, and I always had video stuttering problems with nandub and AC3. Might as well give it a shot.

@ alexnoe I think you misunderstood him, as he probably used the wrong terms. He didn't ment crop, but cut. To cut, you don't need to reencode. Just make as described above. Of course, make sure video and audio are on direct stream copy.

If you want to cut afterwards, you must be lucky to find a keyframe at the right position

Just in case this might help for cutting 

I use AVI split to cut my avi: @ least to show me the cutting results... Hope this help. Regards

Subtitle muxing in AVI-Mux GUI works the same way as with submux.

Yeah, Vdubmod works just fine for AVI/AC3 muxing. I was just still spooked from Nandub's awful AC3 muxing that I didn't want to use anything remotely related to it vdub. 96/96 works perfectly, thanks again.