[Libav-user] Is avcodec_send_frame thread-safe for a single AVFrame ?

[wolverin]

Hello.
I'm doing video transcoding live stream. The H264 input stream from the usb camera, I decided to encode the same AVFrame in different threads for streaming x264 with low bitrate and for jpg snapshots, but at some points avcodec_send_frame is successful, at others it returns error -22, and sometimes even Segmentation fault.
 
What can be done about it?
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