To record from screen I bought "fraps" ages ago. It lets you decide at which resolution and fps you want to record. So my older pc lets me only record at half of my screen resolution.What program do you use to make videos? I tried several times but it always gets very choppy even though the game itself runs smooth while recording. Am I cranking up the settings to high you think?
The resulting very very large avi-file I edit with wondershare video converter. It's just to convert the avi straight forward into a common file like mp4 or so. Optional you can easily edit the recorded avi like cutting or merging a few pieces into one before converting into the final file.
Finally the converter does a good job when upscaling my recorded avi (960x540) into a mp4 (1280x720). That's why the final image isn't as sharp as my real view and might look a bit blurry but I'm fine with it and can't do it any better...