Maybe you have a large MKV or MP4 file and want to shrink it to 300MB for your phone. Here is the ethical, legal method (assuming you own the media).
Software needed: HandBrake (free, open-source, cross-platform). mkv 300mb
Post: "Looking for a specific MKV file that's around 300MB. Does anyone know where I can find one or how to compress a larger file to this size without losing quality?" Maybe you have a large MKV or MP4
Video gets the headlines, but audio consumes a surprising amount of space. To hit 300MB: mkv 300mb