
-c:a sets the audio codec you want to use.-b:v sets the video bitrate, use a number followed by M to set value in Mbit/s, or K to set value in Kbit/s.

Options include libx264 for H.264, libx265 for H.265/HEVC, libvpx-vp9 for VP9, and copy if you want to preserve the video codec of the input video -c:v sets the video codec you want to use.-i is follwed by the path to the input video.

