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

[Involar]

Also, please note that with 3 instances i have no issues and they are stable.

[Carl Eugen Hoyos]

Please post complete, uncut console output.
Is the problem also reproducible with current git master?

Is this only reproducible with network output, or also if you output to a file?
Is this also reproducible if you do not encode at all, for example with -f null - ?
If encoding is needed, does not using external encoders like x264 and libfaac also allow to reproduce the problem?

[Involar]

Hello,
I tested with a file output and i experienced no instability or crashing.
Any kind of streaming seems to get unstable with more instances of ffmpeg running.
I tried with mpegts and h264 muxers and the result was the same. My version is as follows :

ffmpeg -version
ffmpeg version git-2012-03-31-f9143d2
built on Mar 31 2012 23:08:54 with gcc 4.4.3
configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab
libavutil 51. 44.100 / 51. 44.100
libavcodec 54. 12.100 / 54. 12.100
libavformat 54. 3.100 / 54. 3.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 66.101 / 2. 66.101
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 10.100 / 0. 10.100
libpostproc 52. 0.100 / 52. 0.100

ffmpeg -i udp://@239.1.1.2:5000 -pass 1 -crf 10 -vcodec libx264 -preset ultrafast -g 50 -b 500k -bt 100k -threads 0 -acodec libfaac -ab 128k -ar 48000 -ac 2 -async 1 -f mpegts udp://192.168.1.136:5000 -v verbose
ffmpeg version git-2012-03-31-f9143d2 Copyright (c) 2000-2012 the FFmpeg developers

built on Mar 31 2012 23:08:54 with gcc 4.4.3
configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab
libavutil 51. 44.100 / 51. 44.100
libavcodec 54. 12.100 / 54. 12.100
libavformat 54. 3.100 / 54. 3.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 66.101 / 2. 66.101
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 10.100 / 0. 10.100
libpostproc 52. 0.100 / 52. 0.100

[mpegts @ 0x25a33a0] Unable to seek back to the start
[mpeg2video @ 0x25cda20] mpeg_decode_postinit() failure

Last message repeated 10 times

[mpegts @ 0x25a33a0] max_analyze_duration 5000000 reached at 5016000
[mpegts @ 0x25a33a0] Estimating duration from bitrate, this may be inaccurate
Input #0, mpegts, from 'udp://@239.1.1.2:5000':

Duration: N/A, start: 40354.983533, bitrate: 15192 kb/s
Program 100

Stream #0:0[0x1f7]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 720x576 [SAR 16:15 DAR 4:3], 15000 kb/s, 26.94 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x1f8]: Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, 2 channels, s16, 192 kb/s

Please use -b:a or -b:v, -b is ambiguous
[buffer @ 0x26062a0] w:720 h:576 pixfmt:yuv420p tb:1/1000000 sar:16/15 sws_param:flags=2
[libx264 @ 0x29fcbe0] using SAR=16/15
[libx264 @ 0x29fcbe0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
[libx264 @ 0x29fcbe0] profile Constrained Baseline, level 3.0
[mpegts @ 0x2605c80] muxrate VBR, pcr every 2 pkts, sdt every 200, pat/pmt every 40 pkts
Output #0, mpegts, to 'udp://192.168.1.136:5000':

Metadata:

encoder : Lavf54.3.100
Stream #0:0: Video: h264, yuv420p, 720x576 [SAR 16:15 DAR 4:3], q=-1--1, pass 1, 500 kb/s, 90k tbn, 25 tbc
Stream #0:1: Audio: aac, 48000 Hz, 2 channels, s16, 128 kb/s

Stream mapping:

Stream #0:0 -> #0:0 (mpeg2video -> libx264)
Stream #0:1 -> #0:1 (mp2 -> libfaac)

Press [q] to stop, ? for help
* 21 dup!
Circular buffer overrun. To avoid, increase fifo_size URL option. To survive in such case, use overrun_nonfatal option
PES packet size mismatch.0 size= 276021kB time=00:02:16.28 bitrate=16592.1kbits/s dup=21 drop=0
[mpeg2video @ 0x25cda20] ac-tex damaged at 36 21
[mpeg2video @ 0x25cda20] Warning MVs not available
[mpeg2video @ 0x25cda20] concealing 675 DC, 675 AC, 675 MV errors
[mp2 @ 0x25d3be0] incomplete frame
Error while decoding stream #0:1
* 2 dup!
frame= 3431 fps= 24 q=-1.0 Lsize= 278340kB time=00:02:16.93 bitrate=16650.9kbits/s dup=23 drop=0
video:255602kB audio:2139kB global headers:0kB muxing overhead 7.991834%
[libx264 @ 0x29fcbe0] frame I:69 Avg QP: 6.86 size:188256
[libx264 @ 0x29fcbe0] frame P:3362 Avg QP: 9.83 size: 73988
[libx264 @ 0x29fcbe0] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0x29fcbe0] mb P I16..4: 4.5% 0.0% 0.0% P16..4: 84.2% 0.0% 0.0% 0.0% 0.0% skip:11.2%
[libx264 @ 0x29fcbe0] coded y,uvDC,uvAC intra: 95.9% 96.9% 93.9% inter: 72.9% 50.2% 36.3%
[libx264 @ 0x29fcbe0] i16 v,h,dc,p: 24% 34% 29% 13%
[libx264 @ 0x29fcbe0] i8c dc,h,v,p: 25% 39% 23% 13%
[libx264 @ 0x29fcbe0] kb/s:15257.17

[streamingguy]

Any update on this ticket? I have the same issue with UDP streams pushing to network. If the source stream is H.264 (instead of MPEG-2), I can't even push single stream to the network.

[Roger Pack]

this may mean your box or network is too slow. what if you increase fifo_size?

[hemanth.he]

I'm also facing same issue.In my case i can run 6 channels, after starting 7th one it starts giving error.

Here is my system CPU usage for 6 channels.

Cpu(s): 39.0%us,  1.6%sy, 21.8%ni, 37.3%id,  0.0%wa,  0.0%hi,  0.4%si,  0.0%st
Mem:  32844180k total, 14477672k used, 18366508k free,    28748k buffers
Swap: 16490488k total,     7404k used, 16483084k free,  1222388k cached

[Elon Musk]

Please reopen if this still happens with latest version.