<div dir="ltr">Thanks. both the backend and the hdhomerun are connected to the same airport extreme gigabit router.<div><br></div><div>problems occur with both the PBS (channel 23-1) HD main channel and its much lower bitstream rate SD (23-2 and 23-3) subchannels. So probably not a bitstream saturation issue as the SD subchannels broadcast at a much lower rate.</div><div><br></div><div>The other PBS channel (57-1) has only one channel (no subchannels), so conceivably might have a higher bitstream rate, but does not exhibit this problem. Curiously, both PBS channels are on the same clearQAM multiplex.</div><div><br></div><div>Not sure why disk i/o would be the source of the problem, inasmuch as no other channels exhibit this problem, and I regularly record several channels simultaneously on my one HDHomerun with no issues.</div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Feb 8, 2016 at 12:34 PM, faginbagin <span dir="ltr"><<a href="mailto:mythtv@hbuus.com" target="_blank">mythtv@hbuus.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On 2/7/2016 1:20 AM, Jason Zarin wrote:<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
On Thu, Feb 4, 2016 at 6:16 PM, Mark Perkins <<a href="mailto:perkins1724@hotmail.com" target="_blank">perkins1724@hotmail.com</a><br></span>
<mailto:<a href="mailto:perkins1724@hotmail.com" target="_blank">perkins1724@hotmail.com</a>>> wrote:<div><div class="h5"><br>
> On 5 Feb 2016, at 8:14 am, Jason Zarin <<a href="mailto:jason@zarin.org" target="_blank">jason@zarin.org</a> <mailto:<a href="mailto:jason@zarin.org" target="_blank">jason@zarin.org</a>>> wrote:<br>
><br>
>><br>
> Why would that only affect recordings from one particular channel? Recordings on other channels record perfectly.<br>
><br>
><br>
<br>
My only suggestions would be fishing for more clues. What does<br>
mediainfo report of the corrupt file?<br>
<br>
<br>
media info puts out same info as "proper" recording.<br>
<br>
Do PBS recordings made in the middle of the night (or at a<br>
completely different time to your normal PBS recordings) exhibit the<br>
same issues?<br>
<br>
<br>
Yes<br>
<br>
When you deleted capture cards / transports / etc did you select the<br>
"on all hosts" option not just the "on this host" option?<br>
<br>
<br>
Originally did just on this host, but then did a "on all hosts" per your<br>
suggestion. I only have 1 backend, so not entirely sure what the<br>
difference would be. Also deleted video sources as well. No difference<br>
-- still exhibiting same recording issues.<br>
<br>
Is EIT disabled every where?<br>
<br>
<br>
Yes<br>
<br>
In the MythTV log what activities are happening just before the<br>
glitch like transcoding, another recording starting on a different<br>
tuner for example?<br>
<br>
<br>
Nothing<br>
<br>
Was this a network tuner, is it possible something is trying to grab<br>
the tuner away from MythTV?<br>
<br>
<br>
A network tuner, but nothing else trying to grab it.<br>
<br>
No multirec set when it shouldn't be?<br>
<br>
multirec is set fine.<br>
<br>
Can't say any of the above are greatly likely to be the culprit but<br>
might help narrow it down.<br>
<br>
________________________________________<br>
<br>
<br>
Honestly, I'm at wit's end on this. It's not a hardware problem. It's<br>
not a signal quality problem--my hdhomerun is the only thing hooked up<br>
to the cable feed, and it's one meter from the verizon fios box and<br>
hooked up directly. There are no splitters or anything that could weaken<br>
the signal.<br>
<br>
Every other channel appears to work fine, even the other PBS channel<br>
that shares the same transport as the PBS channel that has the<br>
ProcessPAT problem.<br>
<br>
So I've just gone ahead and marked the working PBS channel with a higher<br>
recpriority and let it handle most of the recordings.<br>
<br>
At this point all I can do is assume it's something in the broadcast<br>
source that the mythtv backend just chokes on. Or something goofy with<br>
the hdhomerun driver in linux. Either way, there's nothing I can really<br>
do about it. Maybe try an antenna to see if it's a problem created by<br>
FIOS's rebroadcast on the cable system and not in the original FTA<br>
source, although if I was able to get a decent antenna signal in the<br>
first place, I would even be bothering with clearQAM through cable.<br>
<br>
This was *not* a problem recording the same channel on Windows. So it's<br>
clearly a linux or a mythtv issue.<br>
<br>
If anyone has insight or other ideas, please continue to post in this<br>
thread, but I've expended way more mental capital that I expected to on<br>
mythtv when I set it up in the first place. I guess I'll just let<br>
recpriority take control to minimize recording on the problematic station.<br>
<br>
Thanks<br>
</div></div></blockquote>
<br>
Is your backend and the HDHomeRun connected to the same ethernet switch? Are all switches gigabit switches or some mixture with 100 Mbit in the path? I had a problem with glitchy recordings when my backend and HDHomeRun were not on the same switch and one of the switches was a 100 MBit switch. When I swapped that switch for a gigabit switch, it fixed the problem. The glitches appeared random at first, but they occurred when there was other network activity in the house.<br>
<br>
Why it should happen on only one station, I don't know. Maybe your PBS station uses a higher bit stream rate than the other channels, so it puts more demand on the network?<br>
<br>
If it's not the network, I would also check disk I/O as Hika suggested.<br>
<br>
Helen<br>
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