AVISynth and green looking blocks in the video!?

[jimbobuk]

I am trying to follow the advice on deinterlacing here

http://www.100fps.com/

Namely..

AVISource("Yourmovie.avi")
separatefields

and everything is coming out green.. well background parts are just solid green... is this caused when the original video is NOT interlaced.. i've just captured another video and made sure this time that it WAS interlaced... and it appears fine... just wondering what was happening with the first video..

[sh0dan]

AviSynth version.
AVI codec?
Which app do you load the AVS file into?

[jimbobuk]

latest avisynth i think (its a friend who is doing it) downloaded today... cinepak codec... loading into virtualdub...

with the 2nd file that works we've finally managed to get deinterlacing working... damn it looks real nice too.. I'd love to get that kind of quality working on my tv stream from my tv card (PVR-250)

The original avi worked loaded directly into virtualdub, but had the green block problem when loaded via the avs...

Ok.. I've asked him to try and get it clear..

The video that didn't work was

fullframe: 25fps

The video that works was

halfframe: 50fps

Makes sense really.. i didn't realise this is what had happened... sorry for posting... I assume the split frame tries to halve the frame rate at some point to pick out the odd/even frames... it must of been trying this on a 25fps file.... wierd that it didn't just say error wrong framerate.. rather than going green...

This has started getting me interested in how i can manage my tv captures properly... I am trying this setting of the aforementioned page


The best method (but more time consuming an bigger file size): Progressive Scan (=Weave+Bob)

Get the following the Virtualdub filter "Deinterlace - Smooth" from the website of Gunnar Thalin. Copy it to Virtualdub's "plugins" folder. Go to Virtualdub's filter menu and "Add.." this filter. You may have to check "Alternate field order" within this filter. But this depends upon your movie source.



and getting excellent results.... I assume this kind of stuff is really processor intensive... and beyond the capabilities of a system in realtime... I use SageTV with my PVR-250 hardware mpeg2 capture card... Sage lets you use dscaler and i had a quick go and wasn't that impressed... in general fast motion tends to be quite blurred.. I assume its doing bob... no matter what i try i can't really fix this.. i didn't try all the dscaler options.. tonight i will have a look at following that sites advice and when I take a recording that is an mpeg2 file and go to squash it into a divx I will try using that filter...

If i can't do it in realtime it'd be kind of neat if i could do it for recordings in a batch way... its a pity i need to reencode... I've never looked before but i assume that my mpeg2s are 50 fps and half vertical resolution!?? ohh and then it encodes this with mpeg2... and finally on playback it puts it all back together... isn't there problems introduced in compressing interlaced, with odd and even frames having that 1 line shunt up and down in it.. or does the mpeg take this into account and squash all odds, all evens seperately

SOrry rambling a bit now.. anyone who can shed light on any of this would really help :) thanks