[mythtv-users] No STB channels on Live TV after adding HDHR

Wed Jul 3 00:24:07 UTC 2019

On Mon, Jul 1, 2019, 10:42 AM Stephen Worthington <stephen_agent at jsw.gen.nz>
wrote:

> On Mon, 1 Jul 2019 09:35:50 -0700, you wrote:
>
> >On Sun, Jun 30, 2019, 10:14 PM Stephen Worthington <
> stephen_agent at jsw.gen.nz>
> >wrote:
> >
> >> On Sun, 30 Jun 2019 17:28:07 -0700, you wrote:
> >>
> >> >Ok this is strange.  I added a couple channels on schedules direct, ran
> >> >mythfilldatabase, and restarted the Myth machine. Now the STB channels
> are
> >> >there on watch live TV.  This makes no sense. It has been restarted
> >> several
> >> >times since I had this problem, and mythfilldatabase runs daily (I
> think).
> >> >So go figure.
> >>
> >> Just checking, do you have the systemd fix that makes mythbackend only
> >> start when the network is up and it can access the networked tuners?
> >> ____________________________________
> >>
> >
> >If it's something I had to install separately, no.
>
> In that case, every time you boot, you will be suffering from a race
> condition.  Mythbackend tests all the tuners at startup, and if it can
> not get a good response from a tuner when it tests it, that tuner is
> marked as bad and is never used until mythbackend is restarted.
> Systemd is able to start mythbackend faster and faster with each new
> version of systemd and Ubuntu.  This is the default systemd unit file
> for mythbackend:
>
> root at mypvr:/lib/systemd/system# cat mythtv-backend.service
> [Unit]
> Description=MythTV Backend
> Documentation=https://www.mythtv.org/wiki/Mythbackend
> After=mysql.service network.target
>
> [Service]
> User=mythtv
> EnvironmentFile=-/etc/mythtv/additional.args
> ExecStart=/usr/bin/mythbackend --quiet --syslog local7
> $ADDITIONAL_ARGS
> StartLimitBurst=10
> StartLimitInterval=10m
> Restart=on-failure
> RestartSec=1
>
> [Install]
> WantedBy=multi-user.target
>
> It starts mythbackend as soon as mysql is started, and
> "network.target" is reached.  Unfortunately, "network.target" happens
> when any network interface is available, so as soon as the localhost
> (127.0.0.1) interface is available, "network.target" happens and
> mythbackend is started.  But at that time, the Ethernet interface(s)
> and all the other network interface(s) that you may have are still
> starting up.  By the time mythbackend tries to test the first network
> tuner, the Ethernet interfaces are not up yet, so mythbackend marks
> that tuner bad and goes on to try the next tuner.  Since testing a
> tuner takes a while, at some point in the process of testing all the
> tuners, the Ethernet interface may come up, and after that, the
> testing of the network tuners succeeds.
>
> This was a problem in 16.04 with most people still booting from hard
> disk.  Now that we are running 18.04 and above, and booting from SSD,
> mythbackend it getting started much earlier, and the chance that the
> network tuners will fail testing is increased significantly.
>
> Whether this is your actual problem, I am not sure, but it is a good
> candidate and something you (and anyone who uses network tuners)
> really need to fix anyway.
>
> The fix is a bit complicated - you have to make a systemd unit that
> tests for the Ethernet interface actually being up and able to pass
> traffic, and then have mythbackend wait on that unit before it is
> started.  The tools to do this are on my web server.  If you are not
> running a server version of Ubuntu and have not disabled
> NetworkManager, run the following commands to set it all up.  Watch
> out for line wrapping - my email client does that with longer lines
> such as the wget commands, so the wget and the URL after it should be
> on one line.
>
> sudo su
> cd /usr/local/bin
> wget http://www.jsw.gen.nz/mythtv/wait-until-pingable.py
> chmod u=rwx,g=r,o=r wait-until-pingable.py
> systemctl enable NetworkManager-wait-online.service
> systemctl start NetworkManager-wait-online.service
> cd /etc/systemd/system
> mkdir mythtv-backend.service.d
> chmod u=rwx,g=rx,o=rx mythtv-backend.service.d
> cd mythtv-backend.service.d
> wget
> http://www.jsw.gen.nz/mythtv/mythtv-backend-wait-until-pingable.conf
> chmod u=rw,g=r,o=r mythtv-backend-wait-until-pingable.conf
> cd ..
> wget http://www.jsw.gen.nz/mythtv/local-network-pingable.service
> chmod u=rw,g=r,o=r local-network-pingable.service
>
> Here you will need to change the text in
> local-network-pingable.service where it says "switch.jsw.gen.nz" and
> replace that with the IP address or DNS name of your first network
> tuner (if the tuner is pingable), or otherwise something on your
> network such as your switch or router that is normally pingable when
> your MythTV box is booting.
>
> Use nano or your favourite editor:
>
> nano local-network-pingable.service
>
> Then save the change and exit from nano or your editor and do these
> commands:
>
> systemctl enable local-network-pingable.service
> systemctl start local-network-pingable.service
> systemctl status local-network-pingable.service
>
> The systemctl status command should show that the
> local-network-pingable.service has started and the ping worked.  If
> not, fix that before proceeding.  Then do these commands:
>
> systemctl daemon-reload
> exit
>
> After that, on boot mythbackend will wait for either the ping to work,
> or the 30 second timeout specified in the
> local-network-pingable.service file.  If you want to change that
> timeout, it is the "30" after the ping address.
>
> Since I just typed out all of the above commands, it is possible I may
> have a typo somewhere, so please let me know if I have.
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Ok thanks for the how-to.  I will go through the procedure if I continue to
have problems, but everything seems to be working fine right now.

>
>
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