I know we already use this method other places, but this seems a little confusing.  Could we call this method 'getPaddedVideoLimit', e.g.:

  $paddedLimit = $this->getPaddedVideoLimit( ... )

My worry is that we use both $limit and self::LIMIT_VIDEOS in the following lines of code and someone might interchange them.  Adding the 'padded' makes sure the reader knows this is a different type of limit and that we need both.