Problem with videos

I have problem with ZoinOS.
I dont know, it is problem with system or my weak laptop
When i play some video (low quality, 24fps, 777kbps) and i want to chose ex. on middle of video, it was stops.
Sound and timer moves, but video stops.
Celeron 1,6 x2
Video player default from Zorin.
Is the change HDD to SDD will help?

RAM is a bit low... What is the Graphics Card you are using?

Low-quality integrated.
I install VLC player and it works fine.

In that case, it may be codecs... maybe.
Have you installed the ubuntu-restricted-extras package?