Command line doesn't work

In some of the previous version, VD can receive command line and play the specified video in the command, even if VD is running. I always use this characteristic to control video playback with my own script to do academic experiment.
However, in the latest version, this doesn't work. If VD isn't running, a command line with admin permission can startup VD, but before, there is an annoy warning in HMD. This warning don't appear in the previous version, I remember. Then, when VD is running, the command line no longer works, even with admin permission.
Since VD is the ONLY VR video player I found on Steam with desktop projection, it EXTREMELY agree with our need in experiment.
May I have your help?
THANKS VERY MUCH!