ffmpeg -thread_queue_size 1024 -loop 1 -f image2 -i /root/mafia.png -thread_queue_size 512 -i rtmp://localhost/cam1_s/mystream -thread_queue_size 512 -i rtmp://localhost/cam2_s/mystream -thread_queue_size 512 -i rtmp://localhost/cam3_s/mystream -thread_queue_size 512 -i rtmp://localhost/cam4_s/mystream -thread_queue_size 512 -i rtmp://localhost/cam5_s/mystream -thread_queue_size 512 -i rtmp://localhost/cam6_s/mystream -thread_queue_size 512 -i rtmp://localhost/cam7_s/mystream -thread_queue_size 512 -i rtmp://localhost/cam8_s/mystream -filter_complex "[1:0]setsar=1[a];[2:0]setsar=1[b];[3:0]setsar=1[c];[4:0]setsar=1[d];[5:0]setsar=1[e];[6:0]setsar=1[f];[7:0]setsar=1[g];[8:0]setsar=1[h];[0][a]overlay=850:140[i];[i][b]overlay=1380:140[j];[j][c]overlay=320:460[k];[k][d]overlay=848:460[l];[l][e]overlay=1380:460[m];[m][f]overlay=322:778[n];[n][g]overlay=848:780[o];[o][h]overlay=1380:780" -b 5000k  -f flv rtmp://localhost/result/mystream