To help others that may havea Mini, which exact one is it? Does it have a real Video Card or Integtated Graphics?
At the Apple Icon at top left>About this Mac.
Then click on More Info>Hardware and report this upto but not including the Serial#...
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 6 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version (system): 1.21f4
Also, open Console in Utilities & see if any clues show when trying to play them.
Model Name: Mac mini
Model Identifier: Macmini5,1
Processor Name: Intel Core i5
Processor Speed: 2.3 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache (per Core): 256 KB
L3 Cache: 3 MB
Memory: 2 GB
Boot ROM Version: MM51.0077.B10
SMC Version (system): 1.76f0
I'm not sure if it has integrated video? I think so?
So I had a look in the console & the only thing it reports is:
PM Kernel: IOSurface: Buffer allocation size is zero
No idea what that means.
Good point on the RAM, while 4 GB will be much better, I'd go to 8 GB or 16 GB.
Open Activity Monitor, Show:>All Processes, sort on CPU%, see if anything using too much CPU% when this happens, click on Memory tab, do you have many Pageouts?
If there are many Pageouts RAM increase will for certain help.
Something I forgot to ask, do you have hardware acceleration
enabled in Flash? Right click in the Flash window when a video
is playing, select settings, and make sure the panel with the
hardware acceleration check box is checked.
Depending on how the owner of a sight encoded the video,
it could play well without accelleration or play like crap
without accelleration. Which is why some sites play and