Compress a video with ffmpeg

"FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created."

To decrease a video size natively using ffmpeg:

ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4

Also, you can run it using the docker image:

 docker run -v $(pwd):$(pwd) -w $(pwd)\
        jrottenberg/ffmpeg:3.4-scratch -stats \
        -i input.mp4 -vcodec libx265 -crf 28 output.mp4