[mythtv-users] HD-PVR Dropouts

Greg Oliver oliver.greg at gmail.com
Mon Feb 1 13:49:34 UTC 2010


On Mon, Feb 1, 2010 at 2:33 AM, Marius Schrecker <marius at schrecker.org> wrote:
>
>
>
>
> On Sat Jan 30 19:18 , Christopher Meredith sent:
>
> On Mon, Jan 25, 2010 at 9:43 PM, Christopher Meredith <chmeredith at gmail.com>
> wrote:
>>
>> On Mon, Jan 18, 2010 at 12:31 PM, Alan Young <ayoung at teleport.com> wrote:
>> > Christopher Meredith wrote:
>> >>
>> >> I'm running trunk revision 23143 with an HD-PVR as my capture device
>> >> and in general, it works great. But I am experiencing frequent
>> >> dropouts during recording and it's starting to get on my nerves. Myth
>> >> does a good job of picking back up, but it still causes a loss of a
>> >> few seconds and an accompanying glitch. Here is what I get in the
>> >> backend log when this happens:
>> >>
>> >> 2010-01-17 20:47:34.394 DevRdB(/dev/video0) Error: Poll giving up
>> >> 2010-01-17 20:47:34.398 MPEGRec(/dev/video0) Error: Device error
>> >> detected
>> >> 2010-01-17 20:47:34.399 DevRdB(/dev/video0): Stop(): Not running.
>> >>
>> >> It seems to happen at least once during every recording (sometimes
>> >> more) and doesn't seem to be limited to one or a few channels. Does
>> >> anyone have any ideas what could be going on? Thanks!
>> >>
>> >> Christopher
>> >
>> > What source are you recording from - Cable?  Satellite?  And what input
>> > are
>> > you using -  S-Video?  Component?  RCA?  SPDIF?
>>
>> Sorry, that was a pretty lame description. I am using component cables
>> and optical SPDIF to record 720p cable from an SA3250HD.
>>
>> Per the other response in this thread, I read this thread:
>> http://www.gossamer-threads.com/lists/mythtv/users/409442
>>
>> It looks like I'm now in that same boat. I am wondering whether anyone
>> nailed the problem down. It looks like a couple leading theories
>> centered around dirty AC3 from the source and/or flaky USB
>> controllers. I am actually using three USB hard drives in addition to
>> the HD-PVR and am really hoping that's not the problem. I can switch
>> to stereo for testing purposes though, if people are still thinking
>> that's the culprit.
>>
>
>>So far, no dropouts using RCA stereo cables. I guess the AC3 was the
>> problem. I suppose I could try a better cable?
>
> I've been using my hd-pvr with AC3 over S/PDIFF without dropouts all along.
> Bog standard USB cable over cheap, builtin mobo controller. Would tend to
> support the source theory??
>
> My decoder is a Motorola IP-STP 1700 (or something like that - ethernet
> signal, no builtin harddisk). The only time I have problems (sometimes) is
> if I change channel during a recording.
>

Make sure you are not using too long of a cable as well.  Sounds like
it might also be negotiating 1.1 instead of 2.0.

-Greg


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