ffmpeg -rtsp_transport tcp -thread_queue_size 512 -y -i "rtsp://xxx:xxx@x.x.x.x:554/video.h264" -rtsp_transport tcp -thread_queue_size 512 -y -i "rtsp://xxx:xxx@x.x.x.x:554/live1.sdp" -ignore_unknown -filter_complex "nullsrc=size=1280x720 [base]; [0:v] setpts=PTS-STARTPTS, scale=640x360 [upperleft]; [1:v] setpts=PTS-STARTPTS, scale=640x360 [upperright]; [base][upperleft] overlay=shortest=1 [tmp1]; [tmp1][upperright] overlay=shortest=1:x=640" -an -f flv "rtmp://a.rtmp.youtube.com/live2/xxxx-xxxx-xxxx-xxxx"