Later in this chapter, I’ll show you how you can use HTML5 video but gracefully fall back to Flash.Sometime soon, you should get a more straightforward option that's also free.
Internet Explorer 8 has no HTML5 video support at all, but virtually all Internet Explorer users will have the Adobe Flash plugin. IE does not support other third-party codecs (unlike Safari, which will play anything QuickTime can play). It will also play WebM video if you install a third-party codec, which is not installed by default on any version of Windows. Internet Explorer 9+ supports all profiles of H.264 video and either AAC or MP3 audio in an MP4 container. 
Adobe Flash (9.0.60.184 and later) supports H.264 video (all profiles) and AAC audio (all profiles) in an MP4 container. Mobile phones like Apple’s iPhone and Google Android phones support H.264 video (baseline profile) and AAC audio (“low complexity” profile) in an MP4 container. 
However, QuickTime does ship with support for H.264 video (main profile) and AAC audio in an MP4 container.
So you’re left with the formats that QuickTime supports “out of the box.” This is a long list, but it does not include WebM, Theora, Vorbis, or the Ogg container. In practice, few users are going to do that. In theory, you could require your users to install third-party QuickTime plugins.
Safari on Macs and Windows PCs 3.0+ will support anything that QuickTime supports. Chrome 3.0+ supports H.264, Theora video and Vorbis audio in an Ogg container. Opera 10.60 (and later) also supports WebM. Opera 10.5+ supports Theora video and Vorbis audio in an Ogg container. Firefox 3.5+ supports Theora video and Vorbis audio in an Ogg container. For a comprehensive answer see: There's a compatibility matrix toward the bottom that is beginning to be outdated, but was authoritative at the time the article was written.
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