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wasmvideoplayer v0.4.0

@[TOC](基于WASM的H265 Web播放器) # 1 背景 目前这个时间点,原生支持H265(HEVC)播放的浏览器极少,可以说基本没有,主要原因一个是H265的解码有更高的性能要求,从而换取更高的压缩率,目前大多数机器CPU软解H265的超清视频还是有点吃力,硬解兼容性又不好,另外一个原因主要是H265的专利费问题。因此H265有被各大浏览器厂商放弃的趋势,转而去支持更加开放的AV1编码,但是AV1编码的商用和普及估计还有段时间。

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