What are those lines?

kearlywi · Post by **kearlywi** » Sun Apr 13, 2003 1:41 am

I just wrote the script to use avisynth for my dvd2avi files (.d2v and .wav)
and it does work, but now that i see the final product i have these nasty horizontal lines that become more and more of a nuisance when the action speeds up. Im sure all of you know what Im talking about and fixing it is probably as ez as changing a preference, so if anybody could drop me a hint that would be great.

Zarxrax · Post by **Zarxrax** » Sun Apr 13, 2003 1:44 am

Thats called comb artifacts or interlacing. You can learn more about it in Ermac and AbsoluteDestiny's Guide to All things Video, linked from the guides section of this site...

kearlywi · Post by **kearlywi** » Sun Apr 13, 2003 3:39 am

EADFAG is a truly awesome guide. Ive seen my share of ripping guides and EADFAG is the best hands down. Nicest thing about it is that if something in the guide doesnt make sense I can post my question here. All noobs reading this I recommend a read thru or EADFAG.

Ill run thru the guide a second time (the avisynth and compression sections are a little weighty 8) ) and see if I can get things straighted out. Once I solve it I'll post what I did here. Of course If its a short answer plz dont hesitate to edumakate~ me!

kearlywi · Post by **kearlywi** » Sun Apr 13, 2003 4:52 am

EADFAG wrote: Decomb works in two steps. First you must Telecide the video stream - which essentially turns it into a progressive stream by reconstructing each of the frames that suffer from deinterlacing into their original frames. Then you Decimate the stream, or you remove the duplicate frames created by Telecide. This leaves you with a progressive stream without duplicate frames - thus you've Inverse Telecined the video.

Are both of these steps done with virtual dub filters or AVISynth filters? If its done with AVISynth (ive downloaded the AVISynth decomb pack, couldnt find a virtual dub decomb option ) then do they activate naturally or do I have to enter a command? If there is a AVISynth command for this what is it?

kearlywi · Post by **kearlywi** » Sun Apr 13, 2003 5:03 am

Telecide()
Decimate()

Simple enough (these are for AVISynth)

the Black Monarch · Post by **the Black Monarch** » Sun Apr 13, 2003 9:22 pm

I thought you had to specify Decimate(5)...

NicholasDWolfwood · Post by **NicholasDWolfwood** » Sun Apr 13, 2003 10:07 pm

MPEG2Source("C:\File.d2v")
Telecide(chroma=true,blend=false,post=false)
Decimate(mode=2)
AssumeFPS(24)

That's what your script should look like. Replace C:\File.d2v with the correct file name and path. You don't need audio from the DVD to edit an AMV.

Ashyukun · Post by **Ashyukun** » Mon Apr 14, 2003 7:17 am

NicholasDWolfwood wrote: Telecide(chroma=true,blend=false,post=false)
Decimate(mode=2)

OK, that's a whole lot more in the way of options and/or different ones than I'm used to seeing/using. Are all the telecide options really necessary? And if so, what do they do? And what is the difference between the decimate 'mode=2' in this script and the '5' recommended in the guides?

AbsoluteDestiny · Post by **AbsoluteDestiny** » Mon Apr 14, 2003 7:26 am

5 is the default frame decimation and if you dont specify 5 it will presume it.

Mode=2 is different, it's about which frames it gets rid of:

"[with] mode=2, Decimate() deletes a frame from the longest run of duplicates. This mode is the most reliable with anime and other material where the motion may occur only in every second, third, or fourth (etc.) frames. If you use mode=0 on such clips, there is a danger that incorrect decimation may occur, causing jerkiness. Clips such as those described usually derive from 8fps or 12fps animation, as well as normal 24fps animation where slow motion results in repeated duplicates. Mode=2 is able to delete the correct duplicates in all these cases."

So, yes, it is best with real telecinied anime. It's also a little slower during random seeking and the advantages aren't huge. I left it out essentially because I couldn't be bothered to describe the different modes to people as it makes little difference and just gets people confused.

Ashyukun · Post by **Ashyukun** » Mon Apr 14, 2003 7:55 am

Interesting. I'll have to switch my scripts for the next project to use mode=2 instead of the 5 (don't want to on my current one in case it changes something as a result, and the video is 95% done). Thanks!