Deinterlacing filters
Below you will find a comparission of various deinterlacing filters, the interlaced source was created with mplayer using the phase=t and tinterlace=1 filters from the well known foreman video
all pictures where exported with mplayer -vo pnm and ppmtojpg --optimize --quality 90 why not -vo jpeg? well i didnt had -vo jpeg compiled in and -vo jpeg only accepts rgb input, so there wouldnt have been any advantage in using it …
Most deinterlacing filters only output one frame for every 2 fields that combined with the fact that some always choose the even, some always the odd and some always the first no matter if thats even or odd made this comparission less funny then i hoped originally, due to this little issue several filters (pp=ci and kerndeint IIRC) had to be feeded with vertically fliped video and tomsmocomp even needed -vf phase=b to output a frame based on the correct field and yes i of coarse did specify the top vs. bottom field first flag correctly as long as the filter had such an option …
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Good comparison highlighting effectiveness of YADIF (been a fan since it was first released).
But why is my ffmpeg x264 encode so slooow? -vf “yadif=3:0,mcdeint=2:0,framestep=2,scale=-1:720”
on a tff Sony Handycam 1440x1080i MTS clip gave me just 0.3 ~ 0.4 fps !!!
On an i7 IvyBridge Quad, 16GB RAM, SSD boot, Intel RAID-0 pair of Black Caviars.
I got lots of “snow” msgs of “pass 1” “pass 2”, etc msgs before each encode output, and low CPU usage.
Using simple -vf “yadif=0:0,scale=-1:720” -sws_flags lanczos gets me 38 fps with no discernible difference in visual quality (unless you explicitly look out for them). And 99+% usage on all 8 virtual CPUs.
Did I do anything wrong? Is mcdeint the culprit here (single tasking?) ? It can’t be 100x slower!
Thank you for any guidance and response, I know this is an old thread.
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