id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
1157	Circular buffer overrun with 4+ ffmpeg instances.	Involar		"Hello, im trying to launch multiple transcoding instances on an i7 2600k. Now with 3 instaces everything is fine, but after 4th I get crashes with this error. CPU is at no more than 30% at the moment of crash. Memory ussage is about 500mb/4G. Here is the output.

ffmpeg -i udp://@239.1.1.2:5000 -pass 1 -crf 5 -vcodec libx264 -preset ultrafast -g 20 -b 500k -bt 10k -acodec libfaac -ab 128k -ar 48000 -ac 2 -f mpegts udp://192.168.1.136:5004 -v warning -bufsize 10000 -vframes 10
[mpeg2video @ 0x249da20] mpeg_decode_postinit() failure
    Last message repeated 5 times
[mpegts @ 0x24733a0] max_analyze_duration 5000000 reached at 5016000
[mpegts @ 0x24733a0] Estimating duration from bitrate, this may be inaccurate
Please use -b:a or -b:v, -b is ambiguous
[udp @ 0x24738e0] Circular buffer overrun. To avoid, increase fifo_size URL option. To survive in such case, use overrun_nonfatal option
[mpegts @ 0x24733a0] PES packet size mismatch
[mpeg2video @ 0x249da20] ac-tex damaged at 31 4
[mpeg2video @ 0x249da20] Warning MVs not available
[mp2 @ 0x24a3be0] incomplete frame
Error while decoding stream #0:1.

Now I get it that my fifo buffer is too small to handle 4 instances. Can you please advise where can I change the initial value ?

Thanks in advance

"	defect	new	normal	undetermined	0.10.2						0	0