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On 11/17/2010 08:12 AM, Justin Dunn wrote:
<blockquote cite="mid:SNT118-W33A9F1FFE15748A0D5A9D0C3380@phx.gbl"
type="cite">
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class="Apple-style-span" face="Tahoma" size="4"><span
class="Apple-style-span" style="font-size: 10pt;">Hi,</span></font>
<div style="font-family: Tahoma; font-size: 10pt;">I was reading
about Google TV and it seems to have an HDMI input which displays in
it's interface.</div>
<div><font class="Apple-style-span" face="Tahoma" size="3"><span
class="Apple-style-span" style="font-size: 13px;">Apparently</span></font><font
class="Apple-style-span" face="Tahoma" size="4"><span
class="Apple-style-span" style="font-size: 10pt;"> you can have a full
web browser open with a little corner display of the HDMI input.</span></font></div>
<div><font class="Apple-style-span" face="Tahoma" size="4"><span
class="Apple-style-span" style="font-size: 10pt;">It </span></font><font
class="Apple-style-span" face="Tahoma" size="3"><span
class="Apple-style-span" style="font-size: 13px;">appears</span></font><font
class="Apple-style-span" face="Tahoma" size="4"><span
class="Apple-style-span" style="font-size: 10pt;"> that there must be
an HDMI capture card in </span></font><font class="Apple-style-span"
face="Tahoma" size="3"><span class="Apple-style-span"
style="font-size: 13px;">existence that can capture the HDMI output of
STBs that Google uses.<br>
</span><span class="Apple-style-span" style="font-size: 13px;">So I
was wondering what prevents a HDMI capture card that captures the HDMI
out of STBs existing for consumers that works with Linux and mythtv
from existing? Is it just the HDCP that prevents it?</span></font></div>
<div><font class="Apple-style-span" face="Tahoma" size="3"><span
class="Apple-style-span" style="font-size: 13px;">Justin</span><span
class="Apple-style-span" style="font-size: 13px;"><br>
</span></font></div>
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</blockquote>
<br>
The GTV presumably does what it does by being an HDCP compliant device,
able to decode and re-encode.<br>
<br>
Does HDMI include a protocol for putting an OSD on top of the main
video signal via another channel that GTV<br>
is using? Otherwise, the GTV is deocding the video stream, modifying
it to add OSD (or to shrink it and mix it<br>
as a PIP with the UI) and re-encrypting and sending it out again.
This is not that hard to do, though. The hard<br>
thing is compressing the uncompressed stream, or storing it. Doing
some tricks with it takes much less processing power, and I presume
there are various chips that one can get that also do it.<br>
<br>
For linux boxes, it seems that a card which can take HDMI in, and play
various transforms on it to combine it with other signals and then do
HDMI output would be reasonably doable. Possibly even partly in
software if the incoming signal does not have HDCP. It should be
possible to make a card that does all that with HDCP as long as it does
not make the pass-through stream available to the system, but rather
only allows mixing stuff with it for OSD, and switching and the like.<br>
<br>
Don't know if we in the myth world are enough market for such a card,
though.<br>
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