Grey screen between video files

Hello!
I'm using a Jukebox Software with Video files and the K-Lite Codec Pack Mega.
Between the MP4 Files, there is a grey screen while the next file is loading.

Is it possible to change the grey screen to black? Or isn't this a Codec issue?

Thanks,
George

That is not a codec issue. You need to ask the makers of the Jukebox player to change the background window color.

Thank you for your answer!
Now i know who to ask.

Thanks