Another point is maybe your processor if your machine is an old one. Do you play it from a NAS or USB drive? Sometimes that is too slow and you should copy such movies to your local drive. SSD shouldn't be needed, a HDD should be alright.
Is it graphic cards or processor? Mine is old specs, 2 GHz, NVIDIA Geforce 8400M GS. I play it from hard drive usually. Or should I just convert the movie lower resolution, since the movie is only 6 minutes.
I never had any problems playing video because of my graphic card. Also all the people I know. But CPU is crucial. At least for HD movies. That's why some e.g. Intel Atom can't play HD movies.
Funny, I thought it was the other way around. Sure sounds like it would be the GPU.... http://www.techhive.com/article/140985/article.html
Yeah, okay, if your CPU is weak it is also possible that the GPU does the job. If it supports the encoding...
Well, if you play raw from a bluray or something it'll probably decode off most modern GPU's, if you play it from a file that depends on what video codec the movie is encoded in(I think h.264 is supported by most but probably not x.264(compressed h.264)) the GPU supports decoding. Another thing worth noting is that 10bit which is becoming a big thing(or well it has been for a while now) within Anime fansubbing is virtually unsopported on anything but high end video industry graphic cards(which costs a whole lot more than your average gaming graphics card) so if it's encoded in 10bit your GPU will be of no use at all. Another explanation for your issue could possibly be due to disc overloading, HD content has a fairly high bitrate so if you're doing anything else in the background(such as torrents etc.) that could cause your disc to become overloaded and when you run out of buffered video it'll start to stutter.
his specs are definitely not enough for a raw Blu-ray Muz1234 if you want to check if your cpu is sufficient play the video and make sure you have task manager running while the video is running check in task manager if your video player software is reaching 100% cpu if so your cpu is to slow but i suspect it is your video card because that's a pretty old video card are we talking about a pc or a laptop?
To render videos I would say the most important part is your GPU (Graphics Card). Try using KMPlayer and try all their video renderers, check if one of them suit your needs.