On Sat, 23 May 2020 14:25:30 +0800, you wrote: >Hi
>I'm building 30 on a modern linux. Because of a big deal about python vs python3 it is non trivial to build with python bindings.
>What are they used for on a backend?
>All my metadata lookup is done on the *frontend*, what else?
Wrong, metadata lookup for recordings and (and I think for videos in
storage groups) is done on the backend. Recordings have their
metadata looked up automatically by mythbackend when the recording
completes, I believe, although you can trigger it manually from the
frontend. However, I have metadata lookup disabled, so I have not
followed the ins and outs of making it work properly.
The Python bindings are also used for various ancillary software, such
as find_orphans.py and some external recorder software. I have some
utilities of my own written in Python (mythimport, mythsgu), which are
Python 2 as I have not upgraded to v31 yet.
There is other associated software that also uses Python, but not the
MythTV Python bindings, such as mhegepgsnoop.py which gets MHEG-5 EPG
data from the New Zealand DVB-T free-to-air channels. Mhegepgsnoop.py
is currently only available as Python 2 as far as I know. My solution
to the problem of mythbackend being started before the network is
fully up uses my wait-until-pingable.py program which is Python 3.
As far as I know, building MythTV v30 with Python is simple. It uses
Python 2, so you have to install Python 2 if your system does not have
it. Most, if not all, current distros should still support installing
Python 2 alongside Python 3 - they just come with only Python 3
installed by default. You may need to adjust Python programs to
specify which version they run if they expect the default version to
be Python 2 when it has changed to Python 3. That should be as simple
as changing the #! line at the top of the file to specify the version: #!/usr/bin/env python3
instead of #!/usr/bin/env python
In Ubuntu, there are commands to change which version of Python is the
default, should that be needed. I would not recommend doing that
unless there was no other way to do what you need.
MythTV v31 uses Python 3 by preference, but I think it was talked
about having it also work with Python 2 if Python 3 was not installed.
I am not sure if that happened.
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