How do I save a file as an mp4 rather than .mov?

M4v and Mp4 are virtually the same. M4v is uniquely an apple codec and works on all Apple devices and software, but may not work on non-apple devices and software. This is because m4v carries Apple's Fair Play DRM protection. However, if the DRM protection is removed, there is no essential difference between the formats. While mp4 is universally compatible, m4v is mostly limited to Apple devices and software.

Here's an article that discusses the difference between m4v and mp4.

https://www.winxdvd.com/resource/m4v-vs-mp4.htm

-- Rich

iMovie exports every project as an Mp4 movie at all settings, except projects exported at the Best Quality (pro res) setting that results in a .mov file.

-- Rich

Thanks, Rich. What are the differences in m4v and mp4 and .mov?