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Stefano Sabatini authored
Fix crash, for example in the command: ffmpeg -f image2 -vcodec pgmyuv -i tests/vsynth1/%02d.pgm \ -vf "[in]format=yuv420p,split,alphamerge,split[o3][o4]; [o4]vflip,alphaextract[alpha];[o3][alpha]alphamerge[out]" \ -vcodec rawvideo -f nut md5:
130c6497