Could you please provide the following information:
What are the driver versions that you have tested with?
What is the model of the computer or motherboard being used?
Have you updated the video codecs installed in your system and used other video players?
Have you tested using other type of media such as a Blu-ray movie?
It is not clear to me that there might be an issue with the video controller/drivers if the games are fine and it does not look fine on Youtube.