MP4 Video files don\'t play on external display

[datkinson82]

Hey thank you guys so much for trying to help!
It looks like mp4 was selected my default for me
Laptop is a 2018 model Dell G3 i ordered refurbished from Dell outlet (i5 8300H 8gb ram Nvidia gtx1050ti)
I did all the updates when i got it on thursday including Nvidia drivers
Installed K-Lite mega Codec Pack 15.2.7 ( I also tried a few older version of this to see if it would make a difference)
When a video is playing in Hoster I see LAV Video Decoder and Lav Splitter in the taskbar

I tried the fixes, selected the first 4 boxes.
Also reset preferred decoders and selected no for recommended.

I realized videos play fine on my laptop screen, if I drag the hoster video
window halfway to an external monitor while it\\\\\\\\\\\\\\\'s playing the video will freeze on the external screen but continue playing on my laptop screen.
If I start the video playing with the video windows on the external display
it will just show up and a blank scren and play audio.

I\\\\\\\\\\\\\\\'ve tried a few different HDMI cables and monitors/tvs but they all do the same thing.

Ive also tried playing video files directly from my desktop instead of external HD to see if it would make a difference but it didn\\\\\\\\\\\\\\\'t.