[mythtv-users] Change mythpreviewgen default output size

[Zooka]

Hello,

Is it possible to change the default output size of mythpreviewgen?  I 
understand one can use the command line to create a certain size, but 
the default (ie, when a recording is completed, or a bookmark added) 
still reverts to 320x180.

The purpose is to use this for a theme background when browsing 
recordings, but when the preview is scaled from 320x180 to 1920x1080 it 
is obviously rather pixelated.

Any thoughts?  Thanks.