The next version of YouTube video player
The next version of YouTube video player will have one very useful 
feature – you can hover your mouse to any point in the video, without 
actually moving the playhead, and the YouTube player will show you an 
image thumbnail of the video frame at the position. Thus you can easily 
get a visual gist of the whole video while the clip is still buffering.
I recorded a screencast video and that should give you a better idea of this new feature.
YouTube Storyboards
YouTube, as you know, generates three thumbnail images
 to represent a video and these images are captured using the frames at 
around 1/4, 1/2, and 3/4 points in the video. For instance, if a YouTube
 video clip is 60 seconds long, the image thumbnails would be generated 
around frames at the 15s, 30s and 45s mark respectively.
For the new video player, YouTube generates one big Storyboard of 100
 thumbnails per video and these thumbnail images are arranged in the 
Storyboard like a 10x10 grid. As you move your mouse to different points
 in the video player, it quickly grabs the corresponding thumbnail for 
that position from the storyboard.
This should save time as you can quickly jump to the most interesting
 portions of a video based on the scenes shown in the thumbnails. 
Alternatively, you can skip the video completely if the description 
doesn't match the inner thumbnails.
Here are some sample storyboard images that I downloaded from the 
YouTube website. The new YouTube player was available with quite a few 
popular videos but not all. 
 



 


 
 
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