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Once in a while I receive videos in the M4V format. When I use HandBrake to export the videos to MP4 format, they are exported as M4V files.
Is this a question?
Why are the video files exported as M4V and not MP4?
Well this would be a question for Handbrake, not Premiere. But alas, according to their documentation:
They are the exact same file, the only difference is the extension. MP4 vs M4V.
For MP4 files, HandBrake will automatically use the extension M4V when you pass-through audio (AC3), use SRT subtitles or have chapter markers enabled.
You can simply change the file extension between .mp4 and .m4v as the file is exactly the same. There are no differences in the content or container itself.
You can disable the option to automatically set this in !HandBrakes preferences.
Note: QuickTime or any QT based application will not be able to play a MP4 file with these features enabled, unless it has the extension “.m4v”