From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from gateway08.websitewelcome.com ([67.18.36.18]:48013 "EHLO gateway08.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934170Ab3FTAGs convert rfc822-to-8bit (ORCPT ); Wed, 19 Jun 2013 20:06:48 -0400 Received: from gator886.hostgator.com (gator886.hostgator.com [174.120.40.226]) by gateway08.websitewelcome.com (Postfix) with ESMTP id C6A5D8A873CB3 for ; Wed, 19 Jun 2013 18:46:01 -0500 (CDT) From: "Charlie X. Liu" To: =?UTF-8?Q?'Bj=C3=B8rn_Mork'?= , "'James Board'" Cc: =?UTF-8?Q?'Daniel_=EF=BB=BFGl=C3=B6ckner'?= , "'Steve Cookson'" , References: <1371393161.46485.YahooMailNeo@web163903.mail.gq1.yahoo.com> <8B18C28300FE4A6595829F526C5BA94A@SACWS001> <1371572315.65617.YahooMailNeo@web163901.mail.gq1.yahoo.com> <8737EBB72A154800A3A695B49F355F07@SACWS001> <1371587831.30761.YahooMailNeo@web163905.mail.gq1.yahoo.com> <7ED70E19F5604D7CA44DC92735A6BDE0@SACWS001> <20130618230655.GA23989@minime.bse> <1371648937.52293.YahooMailNeo@web163906.mail.gq1.yahoo.com> <87ip1a42fa.fsf@nemi.mork.no> In-Reply-To: <87ip1a42fa.fsf@nemi.mork.no> Subject: RE: HD Capture Card (HDMI and Component) output raw pixels Date: Wed, 19 Jun 2013 16:46:02 -0700 Message-ID: <005201ce6d47$28a79520$79f6bf60$@com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Content-Language: en-us Sender: linux-media-owner@vger.kernel.org List-ID: If 1080i60 or 1080p30 as max supported, the bandwidth requirement would be 124.416MB/s (1920*1080*2*30, in YUV422 format). Make sense and it can pass through over a PCIe lane x1. -----Original Message----- From: linux-media-owner@vger.kernel.org [mailto:linux-media-owner@vger.kernel.org] On Behalf Of Bjørn Mork Sent: Wednesday, June 19, 2013 7:10 AM To: James Board Cc: Daniel Glöckner; Steve Cookson; linux-media@vger.kernel.org Subject: Re: HD Capture Card (HDMI and Component) output raw pixels James Board 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 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html