Ffmpeg compressed video.

The requirement is to compress a video ,kydy.mp4, The details are as follows ：

  Video part 1920*1080、 Bit rate 2260k, Frame rate 25, Audio bit rate 189kb/s, The total size of the file 1790M.

After several adjustments, the command line finally adopted this time is as follows ：

ffmpeg -i kydl.mp4  -vf scale=1280:720,setdar=1:1 -r 12 -b:v 1024k -b:a 64k 4.mp4

The parameters are resolved as follows ：

-i kydl.mp4( Specified file )

-vf scale=1280:720,setdar=1:1( Set a new video resolution 1280*720)

-r 12（ Set new frame rate 12）

-b:v 1024k （ Set video bitrate 1024k）

-b:a 64k（ Set the audio rate 64k）

After compression , video 789M, The sharpness comparison is as follows ：