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

[D Richard Felker III]

On Fri, Jan 17, 2003 at 11:34:26PM -0600, John Evans wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> 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,

Try the "dint" filter in mplayer. It works by detecting frames where
the fields don't match and dropping them. Read the man page for info
on the options for it.

Rich