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<p>I was having trouble at work getting enough bandwidth for GigE
(gigabit ethernet) cameras and found that, depending on the
switch, other devices plugged into the switch can cause all ports
to be limited to the device's max speed (like 100 Mb, or even 10
Mb). Might try verifying your speed, especially if you've plugged
in a new device, lately.</p>
<p>Dave D.<br>
</p>
<br>
<div class="moz-cite-prefix">On 07/12/2018 04:24 AM, Craig Huff
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAO0hLGpz+mELQHo-fULgO9YXFiYqXvosb69C3OroVXsd6yOO_Q@mail.gmail.com">
<div dir="ltr">I replaced my PVR-500 tuners awhile ago with a
Ceton 6 ETH InfiniTV. I was having trouble with recordings that
acted like they had dropped packets of data. The advice I got
was to increase network stack buffers. That seemed to clear
things up for awhile, but the problem has cropped up again.<br>
<br>
Here are the values I changed and their current values:<br>
<div style="margin-left:40px">net.core.rmem_max=1048576<br>
net.core.rmem_default=1048576<br>
net.ipv4.udp_rmem_min=1048576<br>
</div>
<br>
<div>and here are typical error messages from the
mythbackend.log:<br>
</div>
<div>
<div style="margin-left:40px">Jul 11 21:54:05 penguin
mythbackend: mythbackend[2603]: E CetonStreamHandler
recorders/dtvrecorder.cpp:855 (FindH264Keyframes) DTVRec[1]:
PES start code not found in TS packet with PUSI set<br>
</div>
<div style="margin-left:40px">Jul 11 21:54:10 penguin
mythbackend: mythbackend[2603]: E CetonStreamHandler
recorders/dtvrecorder.cpp:881 (FindH264Keyframes) DTVRec[1]:
PES packet headers overflow to next TS packet, aborting
keyframe search<br>
Jul 11 21:54:10 penguin mythbackend: mythbackend[2603]: E
CetonStreamHandler mpeg/mpegstreamdata.cpp:364
(AssemblePSIP) MPEGStream[1](0x7f005401def0): Error:
offset>181, pes length & current cannot be queried<br>
</div>
<br>
</div>
<div>If I recall correctly other issues that were discussed as
possible causes for this behavior included the Ceton getting
too warm/hot and network architecture.<br>
<br>
To keep the Ceton unit as cool as possible, I have it resting
on top of a 140mm fan which is propped up on rubber feet
providing good airflow up through the Ceton. My recording
setup is in an upstairs area beside the stairwell railing.
The stairs are open to air circulation on both floors.
Despite air conditioning, the air temperature around my MythTV
system can be about 75 F into the evening before coming back
down. At the moment, it is 68 F ambient and the tuners are
reporting temperatures just under 104 F. I am currently
recording a program and, while it appears to be working, I am
seeing errors logged like the last of the three listed above.
These occur at intervals as short as 16 seconds or as long as
3+ minutes.<br>
<br>
</div>
<div>I have the backend and the Ceton connected to an 8-port
Trendnet Gigabit Switch along with other devices including a
daisy chain to another one. As I understand it, anything
other than traffic on this particular switch should be
irrelevant because it is a switch, not a simple hub. I am not
certain what grade of ethernet cables I used to connect the
backend and the Ceton to the switch, but it seems likely that
they are Cat 3.<br>
<br>
</div>
<div>If I have provided enough information to point to what is
causing my problems, I would appreciate any advice on fixing
them. If more information is needed, you have but to tell me
what you need (and if arcane, where to find it).<br>
<br>
</div>
<div>Thank you for any assistance you can provide.<br>
<br>
--<br>
</div>
<div>Craig.<br>
</div>
</div>
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