问题
Does the Youtube API seekTo function accept time in float or in frames? Can you drill down up to two decimal places?
回答1:
Yes, the API accepts seekTo time in float perfectly; it will advance to the closest keyframe before your float, whatever that may be. Here's a demonstration:
http://goo.gl/E4jzu
Seeking to a frame is a little trickier of a beast, as different videos have different fps rates. Since you can't get the fps via the API (unless there's a method I don't know?), it would be too difficult to try to write a wrapper that could convert the frame you want to seek to into a float. If they are your videos, though, and you know the fps rate, it would be pretty trivial.
来源：https://stackoverflow.com/questions/14461176/youtube-api-seekto-in-float-seconds