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On 9/25/2011 10:08, Derek & Cindi Cass wrote:
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<p class="MsoNormal">When you try the hdpvr on the backend, run
lsusb to see which bus it is on. You need to have it on a usb
2.0 bus, and it is recommended that the hdpvr not share that
bus with anything. I would get the same behavior as you
describe when the hdpvr is sharing a bus with anything else
(supposedly even another hdpvr, although I only have 1 and
can’t verify that).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As you can see, the snobby hdpvr doesn’t
have to share like the rest of the world is doing.<br>
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<br>
The HDPVR, digital tuner cards, and any other form of streaming
capture is only going to have very limited buffer space available.
That data must be retrieved from the device within a few hundred
milliseconds, or else it will be lost. The HDPVR is not special in
this regard. USB may claim to operate at 480Mbps, but it is still
the same garbage interface designed to be used for low speed
peripherals like keyboards and mice. It simply cannot handle high
throughput and bus contention gracefully.<br>
<br>
If you wanted a device that was capable of doing this while sharing
the bus with other devices, you should have complained for the
firewire model. There is very good reason why the professional
audio/video crowd stuck with it even after the rest of the industry
abandoned it for the cheaper, supposedly faster, USB.<br>
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