$N variable for Video snapshot prefix Doesn't seem to work

Hi all,

Version : 2.1.3

The following example illustrates the problem. This issues resembles to Ticket #9938 (closed) which is closed.

Using a snapshot prefix such as "$N $T_-", taking a screenshot into a video named "coolvideo.mp4" should produce a snapshot with the file name "coolvideo.mp4 00_00_04-_2013-11-20-00h02m02s229".

At present, in V. 2.1.3 : It produces a file name as : "$N $T_-_2014-04-18-20h18m00s186.jpg"

In essence, this version is not creating the file name with the "$N" variable.

Am I missing something in the use of these variables ;)) ? Thank you for your help or a fix/work around for this issue.