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
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