Like the desktop software, you can also choose video resolution, output quality, FPS, aspect ratio, etc.
Working with web browsers and no installation, you can just upload your M4V file, select MP4 as the output format and then start converting on both Mac and Windows 10. Online services are also good M4V to MP4 converters, and there are numerous choices you can choose from. Check "Use High Quality Engine" and "Deinterlacing" to optimize the video quality, "Hardware Acceleration Engine" to speed up video conversion, "Merge" to merge several videos into a single one.Click Browse icon to select a certain destination folder to save your converted video in MP4 format.Select Name & Tag icon to reset video title, artist, genre or set a cover for the video.Select Edit Video Tab to cut, crop, rotate, flip video and add subtitle, watermark or effects.Click Codec Option icon to reset the video audio parameters by default as you like, including codec, resolution, bitrate, aspect ratio, frame ratio, channel, and sample rate.Convert M4V to MP4 with WinX HD Video Converter Deluxe You can view the whole conversion progress and stop it at any time. Click RUN button on the interface to start M4V to MP4 conversion. Select "MP4 Video" as the output video format and click the OK button to save the change. After the video is loaded, an Output Profile window appears. Open the program, click the "+ Video" button and import the source M4V video file. Download, install and launch WinX HD Video Converter Deluxe on Mac or Windows. How to convert M4V to MP4 on Mac/Windows 10 with WinX HD Video Converter Deluxe