not really newbie but.... syncing problems

[starwarsandrisk]

hey guys,

i've been ripping anime dvds and turning them into divx files for archive, but i've ran into a problem with my noir dvd. I'll rip the vob file with "smart ripper", and then i'll go and encode them in virutal dub "mpeg2/ac3"... i usually encode with 256kb/s mp3 audio and about 580 kb/s with my xvid codec....... problem is..... this time.... i'm getting big audio sync problems.... or video sync problems... depending on how you look at it..... it will start off fine and then the audio slacks behind the video little by little as it goes on..... by the 3rd minuite its all out of wack.... am i doing something wrong?.... or is there something i should know about the ripping?

-Andrew

[SaSi]

The ripping process can't normally "go wrong", at least in terms of audio and video sync.

I assume, from your description, that you use SmartRipper to create a single VOB out of the movie and then open that VOB with VirtualDUB mod (the one that opens MPEG-2 and AC3 video) to re-encode and save as xvid/mp3.

The problem you describe, gradual loss of sync, i.e. video lags behind - OR audio lags behind, appears to be a mistaken framerate setting.

What is the source video DVD? Is it NTSC or PAL? The first will be 29.967... fps and the second will be 25. What is the frame rate you are encoding? Have you modified the setting in VirtualDUB?

[starwarsandrisk]

i figured it had something to do with that..... its 29fps...... where its usually 25 or 23 for all my other movies.... how do i fix that in vdub?

[starwarsandrisk]

i also noticed when looking at the framerate area under video..... i saw where it asks to make the durations match..... it says next to it 27 fps..... which is not 29.... hmm.... is that an issue?

[SaSi]

Well, I think it's not an issue of fixing it, rather an issue of "not breaking" it.

In the VirtualDUB menu, Video-->Frame Rate, select the first radio-button for each block. Not change the frame rate, process all frames, and no inverse telecine.

This should produce a xvid video with the same frame rate as the original.

Now, NTSC experts will tell you that taking the original 29.967 DVD video which has repeat frames every now and then, can be converted to 23.967 or so, which removes redundant frames. There are some guides on this. I can't help you further as I have no experience with such framerates. I live in a PAL country :P