【ffmpeg】avformat的stream中r_frame_rate获取

r_frame_rate ：流的帧率信息

• libavformat\avformat.h

/*** Real base framerate of the stream.* This is the lowest framerate with which all timestamps can be* represented accurately (it is the least common multiple of all* framerates in the stream). Note, this value is just a guess!* For example, if the time base is 1/90000 and all frames have either* approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.*/AVRational r_frame_rate;


读取获取api，废弃了

/*** Accessors for some AVStream fields. These used to be provided for ABI* compatibility, and do not need to be used anymore.*/
attribute_depre