Subtitle not showing on video node

Subtitle not showing on a video node,
when you change the default width and height of VideoNode by any dimension.

<Video 
id="videoplayer" 
width="856" 
height="483" 
translation="[25,95]" 
visible="false" 
enableUI="false" 
enableTrickPlay="false" 
globalCaptionMode="On"/>

In above snippet of code, the video node has the following attribute with a value,
                 "
but when I change this value to this one, then everything is working fine.
                  width="0"
                  height="0"
"

thanks to all of you in advance.