[Libav-user] av_read_frame is given duplicate frames

[wolverin]

Hello, All.
 
I am receiving a stream from a usb mjpeg camera, Everything is OK as long as the capture of frames is constant. If a frame is taken, for example, 1 time in 10 minutes for snapshots, then the frames are identical.
 
If I do av_read_frame sequentially several times (for example, 5 times), then the problem disappears
 
What could be the reason?
Thanks for any help
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