raspivid -o - -t 0 -w 1280 -h 720 -vf -hf -fps 25 -b 4000000 | avconv -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -r 25 -i - -vcodec copy -acodec aac -ab 128k -g 10 -strict experimental -f flv "rtmp://..." -vcodec copy -acodec aac -ab 128k -g 10 -strict experimental -f flv "rtmp://..."