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Posted by Smarty on 02/22/07 19:35
Jan,
What a refreshing and intelligent reply! I've done a bit of research on this
specific topic, and it appears that "Port Multiplication" with SATA drives
in a RAID is an available and more than adequate solution. The web link
cited below shows simple to achieve 230 MB/sec performance and offers a
solution up to around 265 MB/sec as well.
http://www.macgurus.com/productpages/sata/PortMultiplicationGuide.php
This will certainly fill disk drives quickly!!
Given that cable boxes and satellite boxes are not generally providing HDCP
over HDMI, this would appear to be an alternative method to directly capture
cable and satellite HDTV at full resolution.
Smarty
"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
news:erk4r3$kgk$1@news.datemas.de...
> 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)
>
> 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?
>
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