Hi All, I'm using a 2x2 mosaic with four live UDP input streams and I was wondering how to make the mosaic work, even if one of the input channels isn't working. Is it possible? The FFmpeg simply stalls waiting for the input stream. And the UDP timeout raises an error. ffmpeg -i udp://239.192.11.111:1234 -i udp://239.192.11.112:1234 -i udp://239.192.11.113:1234 -i udp://239.192.11.114:1234 -filter_complex "nullsrc=size=640x480 [base]; [0:v] setpts=PTS-STARTPTS, scale=320x240 [upperleft]; [1:v] setpts=PTS-STARTPTS, scale=320x240 [upperright]; [2:v] setpts=PTS-STARTPTS, scale=320x240 [lowerleft]; [3:v] setpts=PTS-STARTPTS, scale=320x240 [lowerright]; [base][upperleft] overlay=shortest=1 [tmp1]; [tmp1][upperright] overlay=shortest=1:x=320 [tmp2]; [tmp2][lowerleft] overlay=shortest=1:y=240 [tmp3]; [tmp3][lowerright] overlay=shortest=1:x=320:y=240" -c:v libx264 udp://239.192.111.1:1234 Regards, Nuno -- Sent from: http://www.ffmpeg-archive.org/