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filgergraph as described can not work, you can not use [alpha] twice, you need to split it: [0:v]split[bg][key]; [bg]crop=720:576:0:0, format=gbrap,setsar=0:1[rgb]; [key]crop=720:576:720:0,format=gray8,setsar=0:1,scale=720:576,split[alpha2][alpha]; [1:v]scale=720:576,format=yuv420p,setsar=0:1[video]; [alpha]negate[neg_alpha]; ...



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