Odd. I tried that command with "ffmpegcolorspace", and it was much better than normal, but still dim. I tried it without "ffmpegcolorspace" and it was much brighter but also a lot grainier. Trying with "ffmpegcolorspace" again and the image was still brighter - as if it remembered the previous setting - and only slightly grainier. hah.

Now if only you could create a shortcut on the desktop that ran a shell command.