Duration of the movie represented by the specified item of the upload list.
value = getVideoUploader("VideoUploaderID").getUploadFileDuration(Index);
A positive integer which specifies an index of the upload list item (i.e. the upload file). An index is 1-based. In other words valid value is in range
A positive integer value that represents a duration (in seconds) of the specified item of the upload list. If an item is non-video, Video Uploader throws the exception.