Vid_20221216_110750_187.mp4.mkv

: A free tool where you can drop the file and select the "MP4" preset to convert it.

If your standard video player (like Windows Media Player or QuickTime) won't open it, use a universal player that supports MKV: VID_20221216_110750_187.mp4.mkv

If you need the file to be a standard MP4 to use on a phone or TV, you can "remux" it (change the container without losing quality): : A free tool where you can drop

(for Mac) or MPC-HC (for Windows): Great lightweight alternatives. 3. How to Fix or Convert It VID_20221216_110750_187.mp4.mkv