Cubase 10.5 Le Lag and bluring video

Cubase 10.5 Le does not smooth and blurring video.
I am using Cubase 5 and 10.5 LE. I am a Vietnamese voiceover, My work on Cubase is narration. So I need to watch the video during I am working.
whenever I import MP4 to work on it in Cubase, I video always is lagged and blurring.
Normally, I solve the problems by covering MP4 - AVI. But now, with Cubase 10.5 I cannot import AVI video also.

what is happing with my computer? Please help me,
I intent to buy a VGA Card to solve my problem, but I am not sure it’s work.

Please help me

Thank you so much!

Hi and welcome,

Please read through Video support in Nuendo, Cubase, WaveLab and Dorico article.