.avs vs. .vob

The Floyd · Post by **The Floyd** » Mon Mar 07, 2005 12:04 am

I was just wondering weither or not I should trust the video quality of an .avs file over the original .vob file. When I open the two in WMP 10 you could clearly see the interlacing when ever there was action on the screen (This was only aparent in the .avs version). So my question is which is a more accurate display of my final output? the .avs script of the original .vob file.

Kalium · Post by **Kalium** » Mon Mar 07, 2005 12:08 am

Well, the .avs only does the processing you tell it to. It might cause some slight slowdown, but with certain exceptions it should be fully frame-accurate. The slight lag aside, there should be no actual difference in lieu of any actual processing.

badmartialarts · Post by **badmartialarts** » Mon Mar 07, 2005 12:30 am

The reason you can see the interlacing with the .avs script is because of the slowdown of processing that happens within the script. Because of this you might be seeing only one field at a time instead of both fields together. You can't see it in the original because your mpeg2 decoder is taking the fields and smushing them together into frames. With an AVS script, that doesn't happen unless you tell it to (with a deinterlacer or even with a simple Weave() command).

badmartialarts · Post by **badmartialarts** » Mon Mar 07, 2005 12:35 am

Wow, I talked out of my ass. Someone who understands combing, explain the situation. I'm too tired to spout of technical stuff.

sysKin · Post by **sysKin** » Mon Mar 07, 2005 4:52 am

Actually I'm pretty sure most (all?) mpeg2 directshow decoders deinterlace. Avisynth only deinterlaces if you tell it to do so. So, video is interlaced.

@The Floyd: short answer - avs is the "real" video, so you'll have to add deinterlacing/ivtc to your script.

MousePotato · Post by **MousePotato** » Mon Mar 07, 2005 7:17 am

But my understanding is that the .avs is just the vob scripted with AVIsynth. How can the .avs be the "real" video when I'm certain that it's just a modified extention file that allows it to be further manipualted through scripting, thus allowing it to be edited in editing applications. Should the final export be an AVIsynth script? Or should it more closely resemble the dvd M-peg 2 version?

Kalium · Post by **Kalium** » Mon Mar 07, 2005 10:10 am

Um.... Wha? How can one export to an AVS script?

If you mean quality, there still shouldn't be a difference. You'll want to IVTC anyway, though.

MousePotato · Post by **MousePotato** » Mon Mar 07, 2005 10:43 am

My bad. I meant should the final out put more closly resemble the scrpit or the original m-peg 2 file?

Kalium · Post by **Kalium** » Mon Mar 07, 2005 10:49 am

How? In terms of quality, there shouldn't be a significant difference. If you're talking about interlacing, you should probably remove it, but it's actually present in the original MPEG-2. Whether or not interlacing is present when you watch at AVS file depends on your script.

trythil · Post by **trythil** » Mon Mar 07, 2005 11:11 am

Black Sun Productions wrote:My bad. I meant should the final out put more closly resemble the scrpit or the original m-peg 2 file?

Well, here's one example...

http://yipdw-4.student.rose-hulman.edu/ ... Processing

Personally I prefer the script output but YMMV