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Authored by: stegu on Friday, September 28 2012 @ 12:07 PM EDT |
95% compression may sound a lot, but for video,
it is actually not all that great. Let's do the
math and use our friend Wikipedia, shall we?
Raw 8-bit RGB old school (non-HD) video frames at 30
frames per second represents a stream rate of over
250 Mbits/s: 8 bits/channel x 3 channels/pixel x
350,000 pixels/frame x 30 frames/s = 252 Mbits/s.
A DVD player (which was a commodity item even back
in 2002) successfully plays video from an MPEG2
data stream that is not allowed to be more than 10
Mbits/s (according to Wikipedia). 10/250 = 0.04.
That's 96% compression right there, and that is not
even the maximum compression you can achieve with
MPEG2, or even the average compression, it's the
guaranteed *minimum* compression while maintaining
an acceptable image quality for any content.
Easy content, and easy scenes in mixed content,
can be compressed significantly more.
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