[mythtv-users] Recording problems with PVR-350 and MythTV 0.24.3
Michael T. Dean
mtdean at thirdcontact.com
Wed Sep 26 05:19:36 UTC 2012
On 09/25/2012 09:07 PM, David Parker wrote:
> On Tue, Sep 25, 2012 at 9:29 AM, Michael T. Dean wrote:
>> On 09/25/2012 04:27 AM, David Watkins wrote:
>>> On 24 September 2012 19:09, David Parker wrote:
>>>> I recently decided to upgrade from my old MythTV box running 0.21 to a
>>>> new box running 0.24.3. I chose version 0.24.3 because I have a
>>>> PVR-350 and PVR-150, and I read in the release notes that support for
>>>> these cards was dropped in 0.25.
>>> AFAIK it was only the video output support for the PVR350 that was
>> Yes--though, technically, it's only support for the PVR-350 decoder that was
>> dropped. You can still use PVR-350 TV out, but will have to use the CPU to
>> decode and Xv for display.
>> Use of the cards for encoding is still fine. And, if you want, you can
>> still use the TV out (though you'll probably get much better quality from a
>> good nvidia video card).
> Thanks for the responses, David and Mike. That's good to know. What
> would the quality loss be if I upgraded to 0.25 and switched from
> hardware decoding to CPU decoding? The CPU a 2.8 GHz Pentium D.
You're likely to get better quality output using an nvidia video card
with CPU decoding than you'd get with PVR-350 decoder output or PVR-350
Since the PVR-350 would still be encoding, there's no loss there. So,
you'd likely do better.
And a 2.8GHz Pentium D has plenty of power to decode 720x480 at 30 MPEG-2
output from your PVR-350 without even breaking a sweat--probably at less
than 10% CPU.
The biggest problem you'll have, though, is if you still need TV out
(i.e. Composite/S-Video/SCART or whatever) versus a "real" output (VGA,
DVI, HDMI, ...), you may find it hard to come by an nvidia card these
days that supports it.
> For the immediate problem, is there anything I can try? It appears
> that my ability to record programs is completely broken, and in
> addition to only recording 15 minutes of the first program, each of my
> test recordings has only had sound for the first 10 seconds and then
> it cuts out. Would a downgrade to 0.23 be worth a try? Also, could
> this be a symptom of overheating the capture card? Just curious,
> because this PC is a BTX design with mostly passive cooling, so it
> probably has poor airflow.
I'd think you'd be better off going to newer than older versions.
Again, there's /no/ reason you can't go to newer versions with your
hardware. All you lose is the
always-had-more-disadvantages-than-advantages PVR-350 decoder
> I was really hoping to avoid buying a new tuner card, but if it comes
> down to that, do you have any recommendations for Nvidia cards? I'd
> love to get one with hardware encoding and decoding like the PVR-350
> if possible.
nvidia card would be a graphics (output) card. The tuner card is a TV
input card. You'll need a capture card (but you have one--in the
PVR-350) as well as a graphics card. You can use the PVR-350 as a
"dumb" graphics card with its Xv support, but I was trying to say that
using an nvidia graphics card would give you better output quality than
the PVR-350 (i.e. you can, but don't need to, upgrade and improve
quality if you like).
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