PVAS vs. DVD2AVI

[gotaserena]

I bought this capture card with built-in MPEG-2 compression and had some trouble transforming the files to DivX/Xvid. I finally figured out a way of loading it into Vdub using avisynth. Somehow DVD2AVI does a much better job demuxing the mpeg file than PVAS(trumento).

So, my question is: why PVAS loses synch? Is DVD2AVI secret on the .d2v file? What exactly is its purpose?

Well, this is my first post, so be kind with me :cool:

[hakko504]

Without knowing anything about PVAS I'd guess that it just trancodes the audio without checking the timedelay between the audio and video, i.e. it takes the first audio sample it finds and encodes it, where it has to wait for an I-frame in the videostream before the conversion starts. This is probably a more common problem if you edit the stream, right? And yes, the .d2v file is very useful.

[gotaserena]

Hello Hakko,

First and foremost, let me thank you for the amount of information you and the doom9 team have made available here. I would never have found a way of editing these mpeg files if wasn't for the FAQs and threads in this forum. Now I'm using DVD2AVI do demux the stream, DeComb.dll in AVISynth to deinterlace it and VirtualDub to reencode it. I've also found that XviD is pretty similar to DivX, except it doesn't crash my computer :P

But to answer your question, PVAS (http://www.offeryn.de/dv.htm) seems to be a popular tool to demux files. I found it to be plainly useless. There was simply no way of synching the resulting audio/video streams.

With all of this solved, I was curious how DVD2AVI keeps the audio stream in synch... With what you said above, my guess would be that the .d2v file is a list of the I-frames which MPEG2Dec3 instructs AudioDub to peg the audio file to. But I'm way over my head here, so I'd better shut up!

But thanks a lot for your answer!