Root Double Videos don't play

[Antera]

After getting to end. screen goes black and sound plays (no visuals) 

is there way to fix it? (do I need to install any software ?) 

My Operating System is 64 bit 

[Dreamysyu]

Do you have any videocodecs installed on your PC? Usually, problems in videos in VNs come from them (though the end credits usually aren't really in the video format, so probably the problem lies in something different). You can try installing CCCP, for example, and check if anything changes.

Also, this:

 

Edited May 6, 2018 by Dreamysyu

[Antera]

I have K-Lite Codec Pack installed. I tried to play videos from gallery, but only sound plays 

[Dreamysyu]

K-Lite sucks. I used it in the past, and I had quite a lot of problems before I switched to CCCP, so I recommend changing it anyway.

[Antera]

tried with CCCP still no luck