-metadata flag sets/removes the metadata of the media file

-i takes input media file

-preset option to set the encoding speed. "superfast" or "medium"

-r sets the framerate of the video

-threads sets the number of threads to be consumed while compression

-c:v libx264 sets the codec to libx264. It's a high speed codec

-s 1280x720 option sets the resolution

-b:v sets the bitrate of media file