How to handle AVERROR(EAGAIN)

[peteryang023]

I meet a problem while calling avcodec_receive_packet to encode png bytes into H264, it returns AVERROR(EAGAIN) in the first 10s, from the comment, it mentions that:
0 on success, otherwise negative error code: AVERROR(EAGAIN): output is not available in the current state - user must try to send input AVERROR_EOF: the encoder has been fully flushed, and there will be no more output packets AVERROR(EINVAL): codec not opened, or it is a decoder other errors: legitimate encoding errors
I want to know how to clear the buffer while returning errors. How to send AVERROR_EOF?

[Ruslan-B]

Transferred, not related to bindings

[Ruslan-B]

I guess looking for C\C++ examples going to be good advice.