ffmpeg -loglevel verbose -i rtmp://127.0.0.1/1/test -i /home/bild.jpg -i /home/bild.jpg -i rtmp://127.0.0.1/2/test -filter_complex "nullsrc=size=1920x1080 [base];[0:v] setpts=PTS-STARTPTS, scale=960x540 [upperleft];[1:v] setpts=PTS-STARTPTS, scale=960x540 [upperright];[2:v] setpts=PTS-STARTPTS, scale=960x540 [lowerleft];[3:v] setpts=PTS-STARTPTS, scale=960x540 [lowerright];[base][upperleft] overlay=shortest=0 [tmp1];[tmp1][upperright] overlay=shortest=0:x=960 [tmp2];[tmp2][lowerleft] overlay=shortest=0:y=540 [tmp3];[tmp3][lowerright] overlay=shortest=0:x=960:y=540" -c:v libx264 -ac 2 -ar 44100 -vcodec libx264 -g 60 -keyint_min 30 -b:v 4000k -minrate 4000k -maxrate 4000k -pix_fmt yuv420p -f flv rtmp://127.0.0.1/output