01a.m4v

: If the file is unprotected (no DRM), you can often simply change the file extension from .m4v to .mp4 manually.

: For protected or stubborn files, use tools like: 01A.m4v

: A command-line tool for advanced users. A standard command to copy the streams into an MP4 container is: ffmpeg -i 01A.m4v -c copy output.mp4 . What Are M4V Files? | M4V Format Explained - Adobe : If the file is unprotected (no DRM),

: Use the "Convert / Stream" feature to export the video as a standard MP4. 01A.m4v

: QuickTime Player and iTunes are the default choices for Apple devices.

: Media Player Classic, RealPlayer, and Zoom Player also support this format. 2. Conversion for Compatibility