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Posted by Smarty on 02/22/07 21:27
True Frank. You are more perceptive even after being without sleep for 24
hours than the rest of us are with normal sleep. The Intensity card does use
subsampled chroma components, 4:2:2. The storage estimate is therefore
somewhat pessimistic.
Smarty
"Frank" <frank@nojunkmail.humanvalues.net> wrote in message
news:311st2dnv5e53jpop16o3721ticpuecgo3@4ax.com...
> 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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