[Libav-user] Unable to Retrieve Frame Rate. it always zero.

[funta]

double fps = 0.0;
avformat_open_input(&in, infile, NULL, NULL);
avformat_find_stream_info(in, NULL);

for(i = 0; i < in->nb_streams; i++) {
   AVStream *input_stream = in->streams[i];
   if(input_stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
      fps = (double)input_stream->r_frame_rate.num /
input_stream->r_frame_rate.den;
      break;
   }
}

printf("FPS: %f\n", fps);



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