01a.m4v -

: For protected or stubborn files, use tools like:

: If the file is unprotected (no DRM), you can often simply change the file extension from .m4v to .mp4 manually. 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 : For protected or stubborn files, use tools