Canon HF100 camcorder (was: [EE] SDHC Cards, was Re:Digital Sound)
Herbert Graf email (remove spam text)
On Tue, 2008-08-05 at 12:56 -0400, Spehro Pefhany wrote:
> Quoting Olin Lathrop <embedinc.com>:olin_piclist
> > Apptech wrote:
> >> 17 Mb/s x 1/8 Bytes x 7200 seconds / 16 MB ~= 956:1*
> > You slipped a few decimal points. HD video is 1920 x 1080 pixels per frame,
> > which is 2.1 Mbyte.
> With no compression or chroma subsampling there are 3 bytes per pixel.
I really depends on the camera in question.
For completely raw numbers:
For 1080i/720p the pixel rate is 74.25MHz.
For 1080p the pixel rate is 148.5MHz.
Note that these rates include the blanking and sync regions of the video
The number of bits per pixel varies though. 8bit/colour (24bits/pixel)
used to be the only game in town, 10bits/colour (30bits/pixel) is now
getting common, and 12bits/colour (36bits/pixel) is starting to appear.
For compression it depends on what codec is used, and what the
compression settings are. For true HD content 17Mbps is about the middle
ground (for Bluray the max video bit rate is 40Mbps).
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See also: www.piclist.com/techref/io/audio.htm?key=sound
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