M4V to MP4
M4V is Apple's variant of MP4. Some programs will not open it by that name. Turn M4V files into ordinary MP4s, usually in seconds. Everything happens on your own device, using the video engine built into your browser, so your video is never uploaded.
How to use it
- Choose your M4V videos, or drag them onto the box.
- Each one is converted on your device.
- Download each MP4, or all of them together as a ZIP file.
Protected videos
Films and programmes bought from the iTunes Store are protected by Apple's copy protection, and cannot be converted here or by any other converter that respects it. Your own M4V videos convert normally.
What is kept
The main video and its sound are kept. Subtitles and any extra sound tracks, such as a second language, are left out, and the result says when this has happened.
Limits
Videos are converted in the browser's memory, so very large files are refused before anything starts; the page shows the largest size tested on your kind of device. Long videos take a while, and the page must stay open and on screen while it works, particularly on a phone.
The page reads what is inside each file before it starts. Dolby Digital (AC-3) sound, which many camcorders use, is read by FilePresto's own converter, on your device. A few formats cannot be converted yet: WMV videos, and Dolby Digital Plus (E-AC-3) and DTS sound. If a file has sound that cannot be read, the page stops and says so, rather than making a silent video; you can then choose to convert the video without its sound.
Questions
Are my files uploaded?
No. The work happens inside your web browser, on your own device. Before your file is opened, this page locks itself: from then on your browser refuses to let it fetch, upload or send anything at all. You can check: once the page has loaded, switch off your internet connection and it will still work. How the lock works.