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本文详细分析了FFmpeg中的av_read_frame()函数，包括其调用流程、内部实现以及在不同格式下的处理方式。从入口函数av_read_frame()开始，深入到read_frame_internal、ff_read_packet和av_parser_init等步骤，解析了如何从流中读取并处理AVPacket。特别讨论了mp4和flv格式下的处理差异，并介绍了如何根据协议设置codec_id。
前言
本文分析av_read_frame函数，该函数在libavformat包下。
/**
* Return the next frame of a stream.
* This function returns what is stored in the file, and does not validate
* that what is there are valid frames for the decoder. It will split what is
* stored in the file into frames and return one for each call. It will not
* omit invalid data between valid frames so as to give the decoder the maximum
* information possible for decoding.
*
* If pkt->buf is NULL, then the packet is valid until the next
* av_read_frame() or until avformat_close_input(). Otherwise the packet
* is valid indefinitely. In both cases the packet must be freed with
* av_packet_unref when it is no longer needed. For 
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