On Sat, Apr 5, 2008 at 12:45 AM, Brian Phillips <<a href="mailto:brian.phillips@gmx.net">brian.phillips@gmx.net</a>> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">Yeechang Lee wrote:<br>
> We'd heard back in January that the Hauppauge HD PVR device allegedly<br>
> could handle up to 25Mbps and so could encode 1080p (Blu-ray) video.<br>
> However, the description now claims "up to 1080i," and in the<br>
> official specifications<br>
> (<URL:<a href="http://www.hauppauge.com/site/products/hd_pvr.html" target="_blank">http://www.hauppauge.com/site/products/hd_pvr.html</a>>), we see<br>
><br>
> # Hardware encoder<br>
> * H.264 AVCHD video encoder<br>
> * Datarates from 1Mbit/sec to 13.5 Mbits/sec<br>
><br>
> What could these datarates mean in this case? The maximum bitrate of<br>
> the component-input video it accepts, or the maximum bitrate of the<br>
> h.264 files it spits out? If the former, what does this imply about<br>
> the device's ability to properly capture the full breadth of 1080i<br>
> 19.39Mbps input?[1] If the latter, is a 13.5Mbps h.264 recording<br>
> really sufficient to capture the full quality of 19.39Mbps MPEG-2?[2]<br>
><br>
> [1] I don't have a Blu-ray player so all I need is 1080i.<br>
> [2] I am told that h.264's vaunted efficiency versus MPEG-2 is mainly<br>
> at lower bitrates, and that the relative efficiency decreases<br>
> significantly at higher bitrates, to something like only 25% better.<br>
<br>
</div>Since component is analog, there is no "bitrate" associated with it. It<br>
would have to be the h.264 being pumped out of the box. As for the quality<br>
of that signal... I dunno.<br>
<font color="#888888"><br>
Brian<br>
</font><div><div></div><div class="Wj3C7c"><br>
_______________________________________________<br></div></div></blockquote><div><br>I would also like to know, once we get Linux drivers, how beefy of a CPU is required. The specs from Hauppauge says a dual core but in Windows can get away with lower CPU as it does video card offload. What will be a requirement for this? Are the apple video 1080p trailers comparable? I'm just hoping my AMD X2 5700 (dual core 2.7ghz) will be able to keep up.<br>
<br>One huge disadvantage of this devices (thanks to nvidia) is our miniumum CPU requirements will go up AGAIN! Unless Nvidia ever blesses up with h.246 offload in XvMC.<br><br>Mitchell<br></div></div>