AVDurationEstimationMethod 1210 3rdparty/include/ffmpeg_/libavformat/avformat.h     enum AVDurationEstimationMethod duration_estimation_method;
AVDurationEstimationMethod 1304 3rdparty/include/ffmpeg_/libavformat/avformat.h enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx);