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About M4V

Convert M4V Apple video to and from common formats in your browser. All processing stays on your device.

What an M4V file holds

An M4V is a video container Apple built on MP4. Inside you find H.264 video and AAC audio, which is what a typical MP4 holds too. Apple uses it for the video it sells through iTunes and for playback on its own devices, where the extension tells the software what it is dealing with.

Take the DRM away and an M4V is an MP4. That is the whole difference: FairPlay digital rights management, which Apple uses to keep a purchase tied to an account, and a different file extension to signal where the file came from. An unprotected M4V will frequently play if you simply rename it to .mp4, because underneath there is nothing else to change.

Strengths and limits

Inside Apple's software and devices M4V works without any thought: efficient H.264 video, DRM on purchased content where that is needed, and iTunes and the Apple players handling the container natively.

A purchased M4V plays on your authorised Apple devices and nowhere else, which is DRM doing exactly what it was bought to do. The extension causes a separate and sillier problem: a non-Apple player may refuse an unprotected M4V that it would happily play as an MP4, because it is going by the file name rather than the contents.

M4V Development History

Apple added M4V in 2007, when iTunes started selling video. The films and shows needed a wrapper Apple controlled, because the studios were not going to license content that copied freely. So M4V was built on top of MP4, which meant Apple devices already knew how to play it, with FairPlay DRM layered on to keep purchases tied to an account.

M4V became what an iTunes video purchase looks like, and it has stayed tied to Apple software and hardware since. Streaming and digital downloads replaced discs over the same period, and M4V came along for that ride rather than being displaced by it. On an iPhone or a Mac it is still the format you meet; elsewhere it mostly is not.

When to Use M4V

M4V makes sense if the work stays inside Apple's world: content heading for iTunes, or playback on Apple devices. It is also the format for video that needs DRM, since that is what FairPlay is doing in there. The video itself is H.264, so quality holds up at sensible file sizes. Outside that ecosystem the extension buys you nothing MP4 does not already give you.

An M4V that will not open on a Windows machine is the usual complaint, because non-Apple players often do not recognise the extension. Whatever you convert with has to understand the container and the codecs inside it. If a file is giving you trouble, converting to MP4 generally ends the argument, since MP4 plays almost everywhere. Keep the original video and audio settings while you do it; re-encoding at different settings costs quality for no reason.

Working with M4V files

You will encounter M4V in video from the iTunes Store and in files exported by Apple software.

For an unprotected M4V, convert to MP4, or often just rename it, and non-Apple players will handle it. A purchased M4V carrying FairPlay DRM will only play through authorised Apple software, and no conversion changes that.

M4V is Apple's MP4-based container, near identical to standard MP4 apart from the option of FairPlay DRM on iTunes purchases. Without that DRM it is effectively an MP4, and renaming the file is often enough to play it. The DRM is the real difference.