[FFmpeg-cvslog] need help to transparent video background

vishal krishna vishal at halwits.com
Thu Feb 16 09:10:51 CET 2012

I have a video, in which a object is moving infront of a green curton. I just
need to transparent that green background so that I can embed that video in my
I am using window XP and ffmpeg to get it done.
After a lot of googling I found LIBAVFILTER is able to do this, but every one
says write a filter...write a filte.......No one told how to write a filter for

I just need the filter(command) for this which is supported by ffmpeg

ffmpeg -i input.flv -vf "this would be the filter" -y output.mp4

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