If you are downloading from video platforms like YouTube, you can use specialized tools to select the format and quality directly:

If you have already downloaded an MKV file but it won't play:

: Tools like the Safari Extension in MKPlayer can help open videos found on websites directly in a compatible player. 2. Converting or "Remuxing" Existing Files

(typically 720x480 or 640x480) is standard-definition quality, often used to save storage space or for better compatibility with older devices. How to Get 480p MKV Files 1. Downloading Directly in MKV

: A popular free tool for converting video. You can choose a "480p" preset and set the output container to MKV.