My youtube video look too bright!, Hardware Acceleration, Video Codec

[itti]

Youtube : https://www.youtube.com/watch?v=xBywdus22f8

When i use 'Google Chrome' and 'turn on'Hardware Acceleration on setting system
when i upload my video on Youtube it look very bright than the original ('Black Color' turn to -> Gray)

but when i watch another video on youtube on Black area ('Black color is still black') why? It doesn't look very bright like my video
I render my video on After effect Cs6 use format that h.264 (Too Bright) / quicktime (seem okay but still bright) /

// if i 'turn off' hardware Acceleration.
My video look great (Black is Black) and it's okay

** How can i fix this, i want to know
How can i render / setting project / or I missing to setting something / what's a codec (you/they) use for render the video to make a video doesn't look too bright when it 'turn on'Hardware Acceleration

Thanks
(I use Pc/Win8.1 Chrome)

[jagabo]

Fix your graphics card's video proc amp settings. The problem you are seeing is the difference between "limited range" (Y=16-235) and "full range" (Y=0-255) video.