[MPlayer-users] Linux port of Donald Graft's "Decomb" deinterlacer for mencoder?

[John Evans]

Hi All,

I am looking for a good postprocessing utility for mencoder. My encodes 
look great using the Decomb postprocessing to deinterlace certain TV 
series on the Windows side but look like **** when I use mencoder pp=lb 
on the Linux side. I have proof of this in the form of sample encodes 
using both Virtual Dub and Mencoder. I will send the samples to anyone 
who requests them since they are too large ( ~1 MB each ) to post here. 
The problem is that there are 2 good frames followed by 2 blurred frames 
( looks like 2 different fields that are combined into 1 frame ). It can 
be shown best by my samples but here is a diagram of what is happening.

frame 1 >>  |  1  |  2  |  3  |  3  |  4  |  5  |  6  |  6  |  7  |
frame 2 >>  |  1  |  1  |  2  |  3  |  4  |  4  |  5  |  6  |  7  |

Each number represents a different field. Numbers between the pipe 
symbol represent a frame. Numbers that are the same between frames 
represent the same field data as the previous / next frame. I have tried 
the "il=" command to attempt to swap field order with the same results. 
I have also tried 29.97. I just get more blended frames. Using 27.97 
with Decomb yields all fields matched with a duplicate frame every 5 
frames. So 23.976 is correct in this case to get fluid motion.

Sample script >>

mencoder -v -mc 0 -o UFO_109_1780_23.avi -oac copy -aid 128 -ovc lavc 
-lavopts vcodec-mpeg4:vbitrate=1780:vhq:vqmin=2:vqmax=3:keying=500 -ofps 
23.976 -ni -vop crop=632:480:3:0,scale=640:480,pp=lb -sws 2 ./UFO109.vob

-- I did the entire series using the same script ( except for names, 
crop, etc. ). Episode 109 was the only one with combined fields. I used 
a similar script for Capatin Scarlet series which resulted in 2 episodes 
with combed frames and all episodes of Thunderbirds were combed.

The source for Decomb can be found in the links at

www.shelob.mordor.net/dgraft/news.html

Thanks in advance for any solutions,

John