Youtube recently offers HD video that means you can watch or download (use other way) higher definition video. But it does not mean all Youtube videos are high definition, it is really hard to know which one you can watch in high definition, most videos are still regular quality which use .flv format.
Recently, Unofficial Google Blog posts a trick to watch and download high quality video. How to do? Actually that should be easier than you thought.
You can add a few letters after a regular Youtube URL. For example, if you added &fmt=6 after normal RUL, you will watch a high quality video (compare to regular one). If you added &fmt=18 you can watch or download high definition video (MP4).
Regular
High quality
High definition
最近Youtube推出高清晰视频，这意味着你可以看到或下载（使用另类方法）高画质的视频。但这并不是说所有的视频都是高清晰，你非常困难地发现那些视频是高画质的，大多数Youtube的视频仍然是.flv格式的普通画质。
最近，非官方的Google Blog发布了一个观看不同画质视频的诀窍。如何观看高画质视频？说起来比你想象的要简单的多。
你可以在一般的Youtube视频网址后添加几个字母。如：如果你在普通视频网址后添加&fmt=6后就会看到相对清晰的视频。如果你添加&fmt=18的话就可以看到或下载高清晰视频(MP4格式)。
你可以比较一下这些视频的不同：
常规视频
高画质视频
高清晰视频
Watch High Definition Youtube Video
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