hello, i think you need to increase fifo_size parameter. (remove pkt_size and buffer_size parameters, but keep overrun_nonfatal=1)
try a fifo_size=524288 if it continue to crash, then try a value of fifo_size=2621400 Circular buffer overrun happen when the computer cannot catch up in processing received data, so increasing the size may help (ie: fifo_size) To understand what is happening here, take a look at https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/udp.c#L500 Best regards, Le mar. 27 oct. 2020 à 22:19, Daniel Dimitrov <596...@gmail.com> a écrit : > Dear all, > I try to retransmit multicast stream . I can partially manage to do it > unfortunately some interruptions in the stream appear , Please help me to > correctly calculate the parameters for the udp url (fifo_size , > buffer_size,bitrate, pkt_size) i want to set video bitrate to 3M and i am > not sure if i have to do muxrate. Command is here : > > *ffmpeg -i > "udp://@ > 238.252.250.9:5000?overrun_nonfatal=1&fifo_size=350000&pkt_size=1316&buffer_size=10000000 > < > http://238.252.250.9:5000?overrun_nonfatal=1&fifo_size=350000&pkt_size=1316&buffer_size=10000000 > >" > -vf scale=720:576 -b:v 3M -maxrate 4M -bufsize 8M -b:a 128k > -muxrate 5M -f mpegts > "udp://@ > 239.253.251.13:5505?overrun_nonfatal=1&fifo_size=350000&pkt_size=188&&buffer_size=2000000&bitrate=5000000 > < > http://239.253.251.13:5505?overrun_nonfatal=1&fifo_size=350000&pkt_size=188&&buffer_size=2000000&bitrate=5000000 > >"* > > i have doubts about most of the udp parameters so please correct me if > anything looks wrong to you. > > *Here is the input stream:* > > Input #0, mpegts, from 'udp://@238.252.250.9:5000': > Duration: N/A, start: 31142.994278, bitrate: N/A > Program 2002 > Metadata: > service_name : RT Doc HD > service_provider: GLOBECAST > Stream #0:0[0x7e5]: Video: h264 (High) ([27][0][0][0] / 0x001B), > yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 > tbr, 90k tbn, 50 tbc > Stream #0:1[0x7e6](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, > stereo, fltp, 192 kb/s > Stream #0:2[0x7e7](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, > stereo, fltp, 192 kb/s > > > * If i execute the command above it crashes after 5min with :* > > > [h264 @ 0x6b52480] reference picture missing during reorder > Last message repeated 1 times > [h264 @ 0x6b52480] Missing reference picture, default is 65814 > Last message repeated 1 times > [h264 @ 0x6ad5380] reference picture missing during reorder > [h264 @ 0x6ad5380] Missing reference picture, default is 65815 > Output #0, mpegts, to 'udp://@ > > 239.253.251.13:5505?overrun_nonfatal=1&fifo_size=350000&pkt_size=188&&buffer_size=2000000&bitrate=4000000 > ': > Metadata: > encoder : Lavf58.45.100 > Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR > 16:9], q=2-31, 3000 kb/s, 25 fps, 90k tbn, 25 tbc > Metadata: > encoder : Lavc58.91.100 mpeg2video > Side data: > cpb: bitrate max/min/avg: 4000000/0/3000000 buffer size: 2000000 > vbv_delay: N/A > Stream #0:1(eng): Audio: mp2, 48000 Hz, stereo, s16, 128 kb/s > Metadata: > encoder : Lavc58.91.100 mp2 > Stream #0:2(eng): Audio: mp2, 48000 Hz, stereo, s16, 128 kb/s > Metadata: > encoder : Lavc58.91.100 mp2 > av_interleaved_write_frame(): Cannot allocate memory:18.08 > bitrate=4995.0kbits/s speed=1.01x > Last message repeated 1 times > Error writing trailer of udp://@ > > 239.253.251.13:5505?overrun_nonfatal=1&fifo_size=350000&pkt_size=188&&buffer_size=2000000&bitrate=4000000 > : > Cannot allocate memory > frame= 9427 fps= 25 q=2.8 Lsize= 230612kB time=00:06:18.24 > bitrate=4994.6kbits/s speed=1.01x > video:138661kB audio:11807kB subtitle:0kB other streams:0kB global > headers:0kB muxing overhead: 53.263130% > [udp @ 0x682e200] Circular buffer overrun. Surviving due to > overrun_nonfatal option > Last message repeated 121516 times > Conversion failed! > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
