The Matroska Video file is a "container" format. It is popular because it can hold multiple video, audio, and subtitle tracks within a single file—perfect for dual-audio releases. Dual-Audio (Hindi + English):

This is standard High Definition (HD). It offers a sharp picture suitable for most laptops, tablets, and mid-sized TVs without requiring the massive storage space of a 1080p or 4K file. Format (.mkv):

and have a legitimate 720p MKV copy (e.g., from a personal rip of your Blu-ray or a legal digital purchase), you could use tools like mkvmerge or HandBrake to:

[verified] — Avengers.endgame.2019.720p.hindi.english.mkv

The Matroska Video file is a "container" format. It is popular because it can hold multiple video, audio, and subtitle tracks within a single file—perfect for dual-audio releases. Dual-Audio (Hindi + English):

This is standard High Definition (HD). It offers a sharp picture suitable for most laptops, tablets, and mid-sized TVs without requiring the massive storage space of a 1080p or 4K file. Format (.mkv): Avengers.Endgame.2019.720p.Hindi.English.mkv

and have a legitimate 720p MKV copy (e.g., from a personal rip of your Blu-ray or a legal digital purchase), you could use tools like mkvmerge or HandBrake to: The Matroska Video file is a "container" format