Problem with videos

Hi.
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.
Spec:
Celeron 1,6 x2
4Gb RAM
HDD.
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?