M4V Mimetype - 视频/ mp4或视频/ m4v？ [英] M4V Mimetype - video/mp4 or video/m4v?

问题描述

我通过HTML5 视频元素投放视频。我发现有关适用于 m4v 视频的MIME类型的冲突信息。大多数演示在源中将类型属性设置为 video / mp4 c>标记中的标记。我读过的一些文章指出，对于Web服务器Mimetype而言， video / m4v ，而另一些则表示 video / mp4 。哪一个是正确的？

I am serving a video via the HTML5 video element. I'm finding conflicting information about the appropriate MIME type for m4v video. Most demos set the type attribute to video/mp4 in the source tag in the markup. Some articles I've read indicate video/m4v for the web server Mimetype, while others indicate video/mp4. Which is correct?

例如，看这篇文章，指出 video / m4v mimetype： http://html5center.sourceforge.net/make-your-html5-video-play-on-mobile-设备

See for example, this article indicating video/m4v mimetype: http://html5center.sourceforge.net/make-your-html5-video-play-on-mobile-devices

本文指示 video / mp4 ：http://www.coolestguyplanettech.com/use-html-5-video-on-all-browsers/

推荐答案

标准媒体类型是 video / mp4 。

标准mp4容器格式通常用于AAC音频和H.264视频+ AAC音频。这些媒体类型不同， audio / mp4 和 video / mp4 ，但是您经常需要不同的音频和视频应用程序并且在某些系统上，只能将默认应用程序与文件扩展名相关联。因此，在某些圈子中，对音频和视频（+音频）使用扩展名 .m4a 和 .m4v ），分别在一个mp4容器中。然而，这不会影响媒体类型，而媒体类型已经通过音频或视频前缀区分了这些类型。

The standard mp4 container format is commonly used for both AAC audio, and H.264 video + AAC audio. These have different media types, audio/mp4 and video/mp4, however often you want different applications for audio and video and on some systems it is only possible to associate a default application with a file extension. Therefore it has become popular in some circles to use the extensions .m4a and .m4v for audio and video(+audio), respectively, in an mp4 container. However this does not affect the media type, which already distinguishes these using the audio or video prefix.

然而，转折点在于Apple开始使用自己的媒体类型，对于来自商店的视频，它们位于mp4容器中并使用 .m4v 扩展名 video / x-m4v 。这被设置为默认在iTunes中打开视频。有时候这是必要的，因为视频使用DRM，AC-3杜比数字音频或mp4容器不常用的其他功能，但iTunes支持用于具有 .m4v 扩展名的文件。如果您依赖此类功能，则可能需要使用此媒体类型而不是标准媒体类型。

A twist, however, is that Apple started using their own media type, video/x-m4v, for videos from their store, which are in an mp4 container and use a .m4v extension. This is set to open the video in iTunes by default. Sometimes that is necessary because the video uses DRM, AC-3 Dolby Digital audio, or other capabilities that are not commonly supported in an mp4 container, but which are supported by iTunes for files with a .m4v extension. If you rely on such capabilities then you may want to use this media type instead of the standard one.

媒体类型不包含 x - 在RFC中标准化并由IANA跟踪。没有名称为 video / m4v 的媒体类型已标准化。非标准媒体​​类型的前缀为 x - 。

Media types with no x- are standardized in an RFC and tracked by IANA. No media type with the name video/m4v has been standardized. Non-standard media types have a x- prefix.

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