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I have been watching a fast-moving video that I'd really love to dissect in slow motion (half or quarter speed; frame-by-frame isn't necessary in this case). Is there a quick and easy way to accomplish this?

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7 Answers 7

up vote 10 down vote accepted

You need to join the YouTube HTML 5 beta program and have a compatible browser.

The playback options are as follows

2x, 1.5, Normal, 1/2, 1/4

Make sure to inspect all restrictions as not all YouTube videos can be played via HTML5.

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Lovely. I like it! –  Andrew Mar 2 '11 at 3:02
    
YouTube API allows suggestedRate player parameter so you can slow to 75%, 50%, 25% etc.using Youtube IFrame API call setPlayBackRate(), getPlayBackRates() available for a given video. youtube.com/watch?v=B1GFzd7KYfI#t=12m03s. NOTE: As per this video on soundslice you can ONLY slow down videos which are encoded to support this video using HTML5 player –  GuruM Feb 22 at 11:05
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sochivid.com supports half and quarter speed (frame-by-frame and precision timing as well!).

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You can just add slow after the word youtube in a youtube link, and you'll get redirected to the page that slows it down. :) The link then contains youtubeslow.com instead of youtube.com. :)

.. Or just go to the page(www.youtubeslow.com) to watch a youtube video in slow motion. :)

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The site is quite brute-force. The play-pause method is being used here rather primitive. You could achieve the same thing by keeping the space bar pressed. The only difference is you can control the slow down to 1/4 or 1/2 speed here. –  GuruM Feb 22 at 10:45
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You don't really need to much. Just download the Chrome extension from EmbedPlus. You can learn more here:

How to watch YouTube video in slow motion using EmbedPlus

and EmbedPlus Chrome Extension for YouTube Slow Motion

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It seems like embedplus is also using the play-pause method, which is rather primitive. You could achieve the same thing by keeping the space bar pressed. The only difference is you can control the slow down to 1/4 or 1/2 speed here. YouTube API allows suggestedRate player parameter so you can slow to 75%, 50%, 25% etc.using Youtube IFrame API call setPlayBackRate(), getPlayBackRates() available for a given video. youtube.com/watch?v=B1GFzd7KYfI#t=12m03s As per this video on soundslice you can slow down videos which are encoded to support this video using HTML5 player. –  GuruM Feb 22 at 10:57
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For Firefox, NetVideoHunterFLV ConverterWindows Media Player is also an option.

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First download the video.
Then watch it with VLC and use the slow motion feature.

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I don't think it is possible unless you download the entire video on your machine. YouTube's Flash Player does not have such an option.

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