ffmpeg中对AVInputFormat结构体中函数的调用

 

opt_input_file()->
      avformat_open_input()->
             init_input()->
                   av_probe_input_format()->
                          av_probe_input_format2()->
                                  av_probe_input_format3()->
                                             read_probe()
            read_header()
      avformat_find_stream_info()

transcode()->
    av_read_frame()->
        read_frame_internal()->
            av_read_packet()->
                read_packet()

exit_avrec()->
      avformat_close_input()->
            read_close()

 

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