I searched for this topic and I found that there is no official way and will not match this page in Google code.
In it, they propose to create a player.
Hide player.
Turn off the player.
Call seekTo () with your video and extra offset.
Wait for the status change to βplayβ.
Press pause.
Call seekTo (originalOffset, false).
Turn on the player.
Show the player. (or something else).
It may not do what you need, but perhaps you can change what you need to achieve your goal using this method.
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