avcodec_receive_frame() 函數的主要功能是從解碼隊列中取出一幀

avcodec_receive_frame()的聲明位于ffmpeg/libavcodec/avcodec.h , 如下：

/*** Return decoded output data from a decoder.** @param avctx codec context* @param frame This will be set to a reference-counted video or audio* frame (depending on the decoder type) allocated by the* decoder. Note that the function will always call* av_frame_unref(frame) before doing anything else.** @return* 0: success, a frame was returned* AVERROR(EAGAIN): output is not available in this state - user must try* to send new input* AVERROR_EOF: the decoder has been fully flushed, and there will be* no more output frames* AVERROR(EINVAL): codec not opened, or it is an enco

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