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How can I adjust brightness and speed while watching a video on YouTube?

If there isn't a way to do this with YouTube's flash player, can I do this with HTML5 video (through their beta)?

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Youtube's HTML5 player provides an option at the base of the video to adjust playback speed. See: webapps.stackexchange.com/questions/9948/… – Ami Dec 3 '10 at 14:23
Already answered (for speed): webapps.stackexchange.com/a/54506/20552 – sagunms Aug 6 '15 at 15:43
up vote 1 down vote accepted

Youtube does not offer brightness/speed controls. It might be possible for a website programmer to implement such controls with HTML5, but youtube has not done so. I would recommend adjusting brightness on your monitor, or downloading the video and playing it back with a local media player program with such controls.

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