[Libav-user] Very slow av_write_frame

[wolverin]

Hello, All.
 
I read data from the SD card on the SoC and send it over the network via libav, the dump on the transmitting side looks like this
 
Output #0, mjpeg, to 'udp://192.168.1.1:5555':
  Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080, q=2-31, 10 fps, 90k tbn
 
The average packet size is 200KB and it is sent via av_write_frame 300-350 ms!!! It turns out about 4.5Mbit/s, but the connection speed is 100 Mbit/s
 
What could be the reason???
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