From: "Bjørn Mork" <bjorn@mork.no>
To: James Board <jpboard2@yahoo.com>
Cc: "Daniel Glöckner" <daniel-gl@gmx.net>,
"Steve Cookson" <it@sca-uk.com>,
"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>
Subject: Re: HD Capture Card (HDMI and Component) output raw pixels
Date: Wed, 19 Jun 2013 16:10:01 +0200 [thread overview]
Message-ID: <87ip1a42fa.fsf@nemi.mork.no> (raw)
In-Reply-To: <1371648937.52293.YahooMailNeo@web163906.mail.gq1.yahoo.com> (James Board's message of "Wed, 19 Jun 2013 06:35:37 -0700 (PDT)")
James Board <jpboard2@yahoo.com> writes:
> You are right. According to your numbers, this card can't work. So
> why would BlackMagic design an HDMI capture card with only one PCIe
> lane if it can't possibly work? It must work somehow. I must be
> missing some crucial piece of information.
>
> The card doesn't support hardware encoding, right? If so, raw pixels
> are the only output. Maybe the card uses more than one PCIe lane?
> What makes you think the card only uses a single lane?
http://www.blackmagicdesign.com/products/intensity/techspecs/ says so.
It also says
HD Format Support: 1080i50, 1080i59.94, 1080i60, 1080p23.98, 1080p24,
1080p25, 1080p29.97, 1080p30, 720p50, 720p59.94 and
720p60.
which makes the 1080p50 calculation a bit irrelevant.
> Are they using lossless compression to get the raw pixels data rate
> under 200-250 MB/sec, which is the PCIe speed?
None of the supported formats need more than ~180 MB/sec.
Bjørn
next prev parent reply other threads:[~2013-06-19 14:10 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-16 14:32 HD Capture Card (HDMI and Component) output raw pixels James Board
2013-06-16 19:15 ` Steve Cookson
[not found] ` <1371572315.65617.YahooMailNeo@web163901.mail.gq1.yahoo.com>
2013-06-18 19:38 ` Steve Cookson
[not found] ` <1371587831.30761.YahooMailNeo@web163905.mail.gq1.yahoo.com>
2013-06-18 20:55 ` Steve Cookson
2013-06-18 23:06 ` Daniel Glöckner
2013-06-19 0:38 ` Charlie X. Liu
2013-06-19 13:35 ` James Board
2013-06-19 14:10 ` Bjørn Mork [this message]
2013-06-19 23:46 ` Charlie X. Liu
2013-06-19 14:21 ` Steven Toth
2013-06-19 14:52 ` Daniel Glöckner
2013-06-19 23:35 ` Charlie X. Liu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87ip1a42fa.fsf@nemi.mork.no \
--to=bjorn@mork.no \
--cc=daniel-gl@gmx.net \
--cc=it@sca-uk.com \
--cc=jpboard2@yahoo.com \
--cc=linux-media@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.