[FFmpeg-user] Crash in recoding UDP stream when use segment command

[MEISA]

When I recoding UDP stream with segment command, the log displays the following message:


Circular buffer overrun. To avoid, increase fifo_size URL option. To survive in such case, use overrun_nonfatal option


The machine configuration:
Intel (R) Xeon (R) CPU E5620 @2.40GHz 2.39 GHz
16.0G Memory


x64 Windows Server 2008 R2 Enterprise


The command I used is:


ffmpeg -y -i "udp://@225.1.2.2:6002?overrun_nonfatal=1" -t 24:00:00 -qcale:v 2 -alternate_scan 1 -f segment -segment_time 01:00:00 M:\\shoulu\\%04d.mxf"


There is a crash occured when the command tried to "segment" after running about 1 hour.
In addition, after I specify the fifo_size value by fifo_size=50000000, the crash disappeared.


And if I set fifo_size=500000000, the ffmpeg will crash when it starts.
Why does the problem occur? Anyone can explain the function of fifo_size?