Interpretation of ffmpeg source code, three stations

1.av_format_inject_global_side_data sets the inject_global_side_data field of s's AVStream to 1.

void av_format_inject_global_side_data(AVFormatContext *s)
       {
      int i;
      s->internal->inject_global_side_data = 1;
      for (i = 0; i < s->nb_streams; i++) {
          AVStream *st = s->streams[i];
          st->inject_global_side_data = 1;// Internal data to inject global side data
      }
}

2.avformat_find_stream_info//Get the stream information of an audio and video file

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