Hello everyone, I use very often Kdenlive, and I think it's a complete solution 
for video editing. Anyway there's something I really miss: a chroma key effect. 
Also a simple one, just for basic compositions.
Actually I use this little hack:
first of all I take the video and export it into a PNG sequence. Then I use 
imagemagick to make a color (00FF00 means pure green) transparent with this 
shell script:

mkdir ready
ls *.png > tmp.txt
exec < ./tmp.txt
while read line  
do
convert -fuzz 5% -transparent "#00FF00" "$line" "ready/$line"
done 

then I create a Kdenlive project with a "presentation clip" using the images of 
the folder "ready", and I mix it with a background video using the transition 
"composite".
It works quite good, especially because you can set the possible color 
variation with "-fuzz" option (5% is often good).
The only problem is that it's not very easy: a graphical interface integrated 
with Kdenlive would be better.

So I hope you can someway integrate this (or a similar) procedure to get 
Kdenlive able to apply Chroma Key effect.
If I can help, just tell me.


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