Codecs avc1.42e01e mp4a.40.2 là gì năm 2024
Embedding Video natively into HTML is a dream come true, finally, with HTML5. But the video tag has it's own quirks. While Firefox mostly asks for ogg/theora video+audio and "just works", serving the right video to Apple+Safari users or users with Opera, IE, etc. on all sorts of hardware/devices gives us cause for new headaches - well, currently. (Fingers crossed for the future.) Show For example, a tag like serves Apple devices well (via). The iPhone 3 pulls Baseline content, iPad grabs the Main version. Nice. A mixed Firefox/everyone-else tag looks like this: Here we got a mute video file, thus codecs only "theora", no "vorbis", contained in an .ogg file, named .ogv (ogg video). For devices/browsers/platforms not understanding .ogg, we offer .mp4 video here. But wait, what's this "avc.4D401F" string? Well, it tells browsers what Profile the mp4 file is in. How do you get that right? Well, the cypher seems to be "The video codec for H.264 is: avc1.YYYYXX where YYYY represents the profile, while XX is the level (multiplied by 10 and turned into HEX):" (via)
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