1 Hour Full High Definition (1080p).
That is a lot of image data. How much exactly?
When:
- Not compressed
- 24 bits for each RGB pixel (8 bits for each: Red, Green, and Blue pixel)
- A (maximum) frame resolution of 1920 x 1080 pixels (16:9 widescreen)
- A frame rate of 24 Hz (24 images each second)
- One hour (that's 3600 seconds)
- Not including sound, subtitles, and such.
The amount of bits is:
24*2073600*24*3600 = 4299816960000 bits
That's 4299816960000 / 24 = 179159040000 RGB pixels
|
How many GigaBytes is that?
Calculated using 1024 per kilo:
(((4299816960000 / 8) / 1024) / 1024) / 1024 = 500.56 GB
Calculated using 1000 per kilo:
(((4299816960000 / 8) / 1000) / 1000) / 1000 = 537.48 GB
And that will NOT fit on one DVD (4.7 GB, or 8.5 GB dual layer)
Nor will it fit on one BlueRay disc! (25 GB, or 50 GB dual layer)
To get this 1 hour movie on a dual layer BlueRay disc, it need to be compressed to far less than 50 GB, because the 720p version and all the extras need to go on there also, and let's not forget about the sound and such.
Let's say this 1 hour Full HD movie data may be no more than 20 GB.
From 500GB to only 20GB. That's a compression ratio of 500 / 20 = 25
The amount of bits that on average may be spend on 1 RGB pixel is:
24 / 25 = 0.96 bits!
How can that be done?!
Next page: Bits and Combinations
Or go to the DigiCom index
|
|
