I also do not see anything when playing the video, it appears to be a still image on my screen
I am using a t440 with a 768p (720p?) TN screen, it has a HD4600 graphics. This screen is very poor but works for me, interestingly though if I fit an IPS 1080 to this same laptop = migraines.
edit: it may be the color accuracy / contrast on my screen is too poor to see the effect? This screen doesnt show all the contrast (Etc) testing on varios sites like the langom lcd test website. Very poor black levels etc (maybe why it is suitable for me to use)
In addition and somewhat unrelated though, fit this screen to another laptop and solve all the problems? No, still get migraines on other laptops with this TN screen.