How much color information does a 8 bit pixel need compared to an 10 bit pixel? What is the difference. As an example how much file size would an single 640x480 frame take if had 10 bit color instead of an 8 bit colour
Theoretically, instead of 3 × 8 = 24 bits per every pixel you need 3 × 10 = 30 bits for every pixel, which gives multiplier 2^30 / 2^24 = 2^6 = 64, i.e. 64 times greater file size than for 8-bit color info.
Practically, there is also alpha channel (10 bits instead of 8 bits), which means another multiplier is 2^2 = 4, so altogether the file size will be 256 times greater.
It is high enough price, isn't it?