[mythtv-users] Google TV HDMI Input

Raymond Wagner raymond at wagnerrp.com
Wed Nov 17 21:24:25 UTC 2010


On 11/17/2010 16:02, Mark Buechler wrote:
> On Wed, Nov 17, 2010 at 3:54 PM, Raymond Wagner <raymond at wagnerrp.com 
> <mailto:raymond at wagnerrp.com>> wrote:
>
>     On 11/17/2010 15:51, Eric Sharkey wrote:
>
>         On Wed, Nov 17, 2010 at 3:28 PM, Robert McNamara
>         <robert.mcnamara at gmail.com <mailto:robert.mcnamara at gmail.com>>
>          wrote:
>
>             Yes, that's what he means, no, it does not bypass HDCP.
>              It respects
>             it entirely.  You will get nothing from a consumer cable
>             set top box.
>
>         Do STB's always use HDCP when using HDMI or would it at least
>         sometimes be disabled?
>
>
>     Always.
>
> The problem with HDMI capture is the size of the stream. I know of no 
> HDMI capture device which will compress (h264?) the stream and 
> real-time compression on the CPU would be rather difficult.

Assuming the boxes are not doing colorspace conversion, you're looking 
at "only" 630Mbps for 720p or 710Mbps for 1080i.  Something like  
HuffYUV would work fine, but you're still stuck with ~30MBps 
recordings.  RTJPEG would do better, but is still going to produce 
massive files.  MPEG2 and H264 are likely out of the question for 
anything but a multi-processor system.
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