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Thread: Canon HF100 camcorder (was: [EE] SDHC Cards,was Re: Digital Sound)
face picon face BY : email (remove spam text)(Olin Lathrop)

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 interlacing (1080i at 60Hz format) you send half
that 60 times per second for a total uncompressed data rate of 62.6
Mbyte/sec or 498 Mbit/sec.  498/17 = about 30:1 compression.

Two hours of 17 Mbit/sec is 15.3 Gbytes, which makes the claim of 2 hours
recording time on a 16 Gbyte card seem plausible.

Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.
<00f801c8f717$4a715930$0300a8c0@main> 7bit

See also: www.piclist.com/techref/io/audio.htm?key=sound
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Subject (change) Canon HF100 camcorder (was: [EE] SDHC Cards,was Re: Digital Sound)

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