来,看看mozilla自己怎么说的
https://developer.mozilla.org/en-US/doc ... ia_formats
MP4 H.264 (AAC or MP3)
The MP4 container format with the H.264 video codec and the AAC audio codec is natively supported by desktop/mobile Internet Explorer, Safari and Chrome, but Chromium and Opera do not support the format. IE and Chrome also support the MP3 audio codec in the MP4 container, but Safari does not. Firefox/Firefox for Android/Firefox OS supports the format in some cases, but only when a third-party decoder is available, and the device hardware can handle the profile used to encode the MP4.
Note: MP4s encoded with a high profile will not run on lower end hardware, such as low end Firefox OS phones.
The MPEG media formats are covered by patents, which are not freely licensed. All the necessary licenses can be bought from MPEG LA. Since H.264 is currently not a royalty free format, it is unfit for the open web platform, according to Mozilla [1, 2], Google [1, 2] and Opera. However, since royalty free formats are not supported by Internet Explorer and Safari, Mozilla has decided to support the format anyway, and Google never fulfilled their promise to remove support for it in Chrome.
倒是什么都不懂也敢闭着眼瞎扯啊。
啪啪,啪啪,啪啪,爽不?