How can I compress video by taking advantage of its static content?

Question

I have an HD video that is a presentation, so it consists mostly of still images. It's a 50 minute, 200MB MP4 file, downloaded from YouTube.

Is there a way to take advantage of the static nature of the content to compress it further?

Answer 1

That's done automatically by video compression. That's how video compression works.

Parts of the image that don't move or move in a predictable way, are described not by the image data, but by a reference to the previous image's data.

Advanced Codecs that takes a long time to run can even use data from the next image.

Answer 2

You can use FFmpeg, a command-line tool,

ffmpeg -i in.mp4 -crf 23 -preset slow -b:a 96k out.mp4