Your interpretation of quality and my interpretation may differ as well as anyone else, therefore your subjective way is tainted. You need a definitive measurement of sort that will recognize pixel strength, movement, blur, saturation, density, focus and such.
This will all be handled according to the equipment used of course. What type of input/output media-processing-recording and capture are being used. As well as storing the data via film, digital or magnetic tape?
The variables are consistence to the finished product. ie: $100,000 3D theater projector or a home movie 8mm camera? There is a difference.
Now, back to your graphics card. Can it handle stressing the media analysis?
My point is this. There is no ONE GOOD ANSWER. I would suggest starting to research from this site : http://www.linux.com/news/software/applications/321373-the-beat-goes-on-open-source-multimedia-tools-part-2
This may not be definitive enough but you can get a good start.