[mythtv-users] HDMI Capture

Michael T. Dean mtdean at thirdcontact.com
Mon Sep 18 13:49:23 EDT 2006

On 09/18/06 11:01, Steven Adeff wrote:

>On 9/18/06, list at onnow.net <list at onnow.net> wrote:
>>Quoting Gene Stapp <genestapp at gmail.com>:
>>>Graeme Wilford wrote:
>>>>On 12/09/06, Steve Daniels <steve.p.daniels at googlemail.com> wrote:
>>>>>Just seen this in the register:
>>>>>Reckon something like that could be used in linux as a capture device for
>>>>>myth maybe?
>>>>>Please feel free to ignore if this is a rubbish idea..
>>>>So presumably, it may be possible to capture off-air HD in the UK?
>>>>Say, taking the component output of a SkyHD box, converting it to HDMI
>>>>using something like this:
>>>>http://www.gefen.com/kvm/product.jsp?prod_id=3569 and then throwing it
>>>>at the intensity card... ?
>>>>I'm stuck with SD on NTL and a PVR350 right now but this does sound
>>>I emailed the blackmagic development team about the intensity card. It
>>>looks like on the fly compression is doable with a dual core from what
>>>they are saying.

>>>1. In the Windows platform, we allow the user to capture and compress
>>>on the fly to a JPEG format while on the Mac, to DV, PhotoJPEG as
>>>well as DVCPRO HD. A fast processor will be necessary and also a
>>>capture friendly codec. Certain codecs don't fare well with on the
>>>fly compression, d.g. HDV.
>>This is excellent.  I for one, would be willing to shell out for 8
>>drives in a raid and the card.  Whats the next step from here?
>>Linux drivers?
>Or an Intel Dual Core for on the fly mpeg2 encoding. Or a "PVR"
>version of the card with onboard mpeg encoding...

I still don't think you'll get real-time compression of 1080i60 or 
720p30 to MPEG-2 in real time (let alone MPEG-4 Part 2 or MPEG-4 Part 10 
(H.264)).  The RTJPEG (or is it just thousands of sequenced JPEG images 
on disk?) is doable with the right processor, but MPEG-2 and MPEG-4 will 
probably require post-capture transcoding with any processor available 


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