trigger the seeked signal after seeking because due to a bug in jwplayer, it's
not triggered when the video was paused.
/**
* @name Foo
* @class
*/
/**#@+
* @memberOf Foo#
* @field
*/
/**
* @name bar
* @type Object[]
*/
/**#@-*/
/**
* @name Foo2
* @class
*/
/**#@+
* @memberOf Foo2#
* @field
*/
/**
* @name bar
* @type Object[]
*/
/**#@-*/