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Posted by Frank on 02/22/07 21:01
On Thu, 22 Feb 2007 13:12:00 GMT, in 'rec.video.production',
in article <Re: Capture HD video directly from HDMI uncompressed>,
Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:
>On a sunny day (Wed, 21 Feb 2007 10:02:45 -0500) it happened "Smarty"
><nobody@nobody.com> wrote in <sZydnTCBCcaIwkHYnZ2dnUVZ_rmdnZ2d@adelphia.com>:
>
>>Blackmagic has introduced a very novel capture card called Intensity for
>>$249 which has an HDMI input and an HDMI output connector. It makes the
>>impressive claim of eliminating HDV compression penalties by directly
>>capturing uncompressed 1920 X 1080 HD video directly from HDV camcorders (at
>>least those which have an HDMI output port) as well as from other HD and SD
>>video sources. It offers a number of other impressive features as well, in
>>particular real-time down-conversion from HD into SD and the ability to sync
>>and switch 2 HDV camcorders with 2 cards in a studio setting. It provides
>>HDMI output to drive monitors, projectors, etc. Macs and PCs are supported,
>>but do require one newer PCI Express slot. It would appear to allow
>>off-the-air HD capture external to set-top boxes equipped with HDMI (and
>>DVI) outputs.
>>
>>Since copyright materials could be captured and digitized, the advertising
>>plainly excludes protected content, and says the board will not be useful
>>for those purposes.
>>
>>More info at: http://www.blackmagic-design.com/products/intensity/
>
>Hi, thank you for the interesting posting.
>For 1920x1080 @ 25fps I was thinking about the transfer rate for the disk
>system that is required.
>Let's see:
>1920 x 1080 x 25 x 24 (bit per pixel) / 8 = 155 520 000 bytes / second,
>is about 155 MB /s (1 244 160 000 bps, or 1.24 Gbits / s)
Someone please correct me if I'm wrong (or if after 24 hours straight
I really do need some sleep), but I believe that it's 4:2:2 not 4:4:4,
so it's not 24 bits per pixel.
>It seems the disk system will have to be able to do about 200 MB/s sustained.
>
>Not every harddisk will sustain this, I just looked around at the seagate
>site for a usable disk...
>It is not an interface issue (SATA or SCSI), SATA goes to 3Gb/s, but more
>a drive issue.
>Any comments?
As above.
--
Frank, Independent Consultant, New York, NY
[Please remove 'nojunkmail.' from address to reply via e-mail.]
Read Frank's thoughts on HDV at http://www.humanvalues.net/hdv/
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