Ubuntu crashes rendering video

[Douglas Pollard]

       Hi all, I have been having a problem with OpenShot Video editor 
crashing when rendering video. Thought the problem was in the video 
program but found Pitivi and Cinelerra does the same. I have an Asus 
mother board,  about year 2006 with only 1G ram.  I need to check with 
asus to see if the motherboard will run more ram.  Ubuntu is being 
crashed by the video programs and I have Debian on another drive and It 
will also crash when rendering.
     The programs up until about 2 weeks ago have been running fine.  
before I run out and buy more ram does anyone have any other 
suggestions.       I have been able to convert from one file type to 
another using WinFF.  I am not sure if that fits the definition of 
rendering or not.              Doug