
Regular YouTube quality:
480x260 video quality:
1280x720 video quality:
The downside is that very few videos support the higher resolution. Most people who upload YouTube videos do so with the video already compressed. If the video wasn't uploaded in a higher resolution video format, then using the new suffix doesn't change anything, and that lower quality remains a vast majority of the YouTube library. Unless YouTube actually starts making an effort to attract HD content, or better advertise the HD content it already has, I'm not sure that this will make much of an impact.
Cameras
Camcorders
Cell Phones
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Desktops
HDTV
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Printers
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"YouTube Experiments with High-Quality Video" Comments