[mythtv-users] Clunky tuner detection in mythtvsetup

[John Pilkington]

On 08/08/17 16:10, John Pilkington wrote:
> On 08/08/17 15:22, Stephen Worthington wrote:
>> On Tue, 8 Aug 2017 10:52:18 +0100, you wrote:
>>
>>> I have two devices with three DVB-T tuners on this box, running 30pre3
>>> with the 4.4.79-1.el7.elrepo.x86_64 kernel.
>>>
>>> $ dmesg | grep adapt
>>> [   18.492232] DVB: registering new adapter (Kworld UB499-2T T09)
>>> [   18.497274] usb 1-1: DVB: registering adapter 1 frontend 0 (Afatech
>>> AF9033 (DVB-T))...
>>> [   18.500472] DVB: registering new adapter (Kworld UB499-2T T09)
>>> [   18.516789] usb 1-1: DVB: registering adapter 2 frontend 0 (Afatech
>>> AF9033 (DVB-T))...
>>> [   20.417032] DVB: registering new adapter (saa7133[0])
>>> [   20.417041] saa7134 0000:07:04.0: DVB: registering adapter 0 frontend
>>> 0 (Philips TDA10046H DVB-T)...
>>>
>>> The adapter error rates vary, 0 being the best and 2 the worst.  I aim
>>> to have multirec settings of 8, 5, 5.  I have had this in the past but
>>> recent trials had upset things;  yesterday I saw a gap in the schedule
>>> and tried to improve matters.  It was a frustrating experience and I'm
>>> not yet sure that I got what I wanted: a simple and logical assignment
>>> of 'virtual tuner' numbers.
>>>
>>> The card identification process showed the type but probing often failed
>>> to show the device identifier, and restarts always involved lengthy
>>> searches for disecq trees and upnp devices like VBox, which I know I
>>> don't have.  The kernel identified my hardware soon after boot.
>>>
>>> There was some work on this sort of thing at Ticket #12547 but setup is
>>> typically done once and then forgotten.  Have I missed some shortcuts?
>>>
> Stephen:  Thanks for your very comprehensive reply.  Well worth reading 
> although I've cut it here.
> 
> Multirec can be > 5 in master - the higher value gets used mainly by my 
> radio recordings.
> 
> I have a dvb.conf file which works with that el7.elrepo kernel but 
> didn't the last time I used a standard el7 kernel.
> 
> I suspect that some of my dropped or misplaced packets happen because 
> trees are growing on my sight line and the pci-card or its driver just 
> copes better.  Everything comes through the same aerial and preamp, with 
> various splitters after.  Do you have away of detecting buffer-overruns?
> 
> I did edit the DB entries when code changes lost multirec early last 
> year, and I may well try it now, but it's not a good general solution.
> And I did consider clearing everything for a fresh start - but was 
> initially hoping for a quick fix.
> 
> I had the impression that the disecq and upnp delays were going up with 
> my multirec numbers.  I've found some of the code but as yet it's not 
> entirely clear...
> 
> Cheers,
> 
> John

cardutil.cpp has lots of ifdefs which I might try unsetting for personal 
use - if I knew how to do it.

Here's what I ended up with.  It looks probably ok, but it's scheduling 
14 and 15 for the second mux, when I intended 8 and 9.  I'll try it for 
a few days.

MariaDB [mythconverg]> select cardid, parentid, videodevice, schedorder, 
livetvorder
     -> from capturecard ;
+--------+----------+-----------------------------+------------+-------------+
| cardid | parentid | videodevice                 | schedorder | 
livetvorder |
+--------+----------+-----------------------------+------------+-------------+
|      1 |        0 | /dev/dvb/adapter0/frontend0 |          1 | 
   8 |
|      2 |        1 | /dev/dvb/adapter0/frontend0 |          1 | 
   8 |
|      3 |        1 | /dev/dvb/adapter0/frontend0 |          1 | 
   8 |
|      4 |        1 | /dev/dvb/adapter0/frontend0 |          1 | 
   8 |
|      5 |        1 | /dev/dvb/adapter0/frontend0 |          1 | 
   8 |
|      6 |        1 | /dev/dvb/adapter0/frontend0 |          1 | 
   8 |
|      7 |        1 | /dev/dvb/adapter0/frontend0 |          1 | 
   8 |
|      8 |        1 | /dev/dvb/adapter0/frontend0 |          1 | 
   8 |
|      9 |        0 | /dev/dvb/adapter2/frontend0 |         13 | 
  17 |
|     10 |        9 | /dev/dvb/adapter2/frontend0 |         13 | 
  17 |
|     11 |        9 | /dev/dvb/adapter2/frontend0 |         13 | 
  17 |
|     12 |        9 | /dev/dvb/adapter2/frontend0 |         13 | 
  17 |
|     13 |        9 | /dev/dvb/adapter2/frontend0 |         13 | 
  17 |
|     14 |        0 | /dev/dvb/adapter1/frontend0 |          8 | 
  12 |
|     15 |       14 | /dev/dvb/adapter1/frontend0 |          8 | 
  12 |
|     16 |       14 | /dev/dvb/adapter1/frontend0 |          8 | 
  12 |
|     17 |       14 | /dev/dvb/adapter1/frontend0 |          8 | 
  12 |
|     18 |       14 | /dev/dvb/adapter1/frontend0 |          8 | 
  12 |
+--------+----------+-----------------------------+------------+-------------+
18 rows in set (0.01 sec)