x265_encoder_encode return numcodedframe 0

[Former user]

The API x265_encoder_encode call the fun of encode(const x265_picture pic_in, x265_picture pic_out),in this encode fun,when it is in non-zerolatency,i.e m_bZeroLatency is false,then it will return 0,then x265_encoder_encode will output 0 encoded nal units.