If you are planning to upload this to social media, most modern platforms (like Instagram and TikTok) support the .m4v format, so you should be able to upload it directly without needing a converter.
"POV: It’s Cassi’s 20th birthday and the film is strictly vintage. 🎂📺 Part 2 of the memories we never want to forget.#Cassi20Aninhos #VintageAesthetic #BirthdayMemories" Vintage Prt 02 Cassi 20 Aninhos -1.m4v
Vintage Part 02: Cassi’s 20th Birthday Body: "There is something so special about old M4V files. This second part of the footage from Cassi’s 20th birthday captures all those small, 'vintage' moments—the laughter, the friends, and the 20-year-old energy. A perfect little time capsule." If you are planning to upload this to