It looks like that mp4 to m1v conversion represents transformation between two different generations of MPEG codecs, namely 4 and 1. Certainly doable in many multimedia converters and even some video editing programs. Quality won't change, just compatibility for certain programs.
Home > Search converters: mp4 to m1v
Conversion of mp4 file format to m1v file format beta
Search for mp4 to m1v converter or software able to handle these file types.
Convert MPEG-4 video file format to Moving Pictures Experts Group video (MPEG-1 IPB).
We have found 3 software records in our database eligible for .mp4 to .m1v file format conversion.
Microsoft Windows software 
- convert mp4 to m1v on Windows
Freemake Video Converter
One of the most popular and succesfful free video conversion sofrware
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from mp4 file | Yes, Freemake Video Converter supports mp4 file conversion as a source file type. | No | No | No | No | No | No | No |
to m1v file | Yes, Freemake Video Converter supports m1v file conversion as a target file type. | No | No | No | No | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned mp4 to m1v. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Adobe Premiere Pro
A timeline-based video editing software from Adobe
Apple macOS / Mac OS X software 
- convert mp4 to m1v on OS X
Adobe Premiere Pro for Mac
Mac version of Adobe's prime video editing software
Additional links: Open mp4 file, Open m1v file
MP4
An mp4 file extension is typically used for MPEG-4 multimedia files defined by ISO 14496-1 standard. Commonly used for video and movie files and supported by vast number of media players.
M1V
The M1V file extension is related to the Moving Pictures Experts Group video MPEG-1 video compression format. The .m1v file stores MPEG-1 compressed video.
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