Help debugging needed

[Russel Winder]

Hi,

Me TV (a GStreamer/GTK DVB-T player) was working fine on my Debian Sid
laptops 2017-08-24. I will admit to using gstreamer1* packages from
experimental, but maybe I should give this up and revert to using
unstable.

I started making some changes to the Me TV UI but not to the GStreamer
(just playbin really) stuff as far as I know. I got to the stage of
doubting everything so pulled the known to work 2017-08-24 executable
from my backups, I also got the definitely known to work 2017-07-23
executable. All of these give the same problem when trying to play a
DVB stream, which indicates that the problem is actually the gstreamer
packages and plugins on my system. 

The error message I am currently getting in all situations is:

terminate called after throwing an instance of 'std::runtime_error'
  what():  adapter0, frontend0: GStreamer error: state change failed and some element failed to post a proper error message with the reason for the failure.
Aborted

which results from an exception I throw in my GStreamer bus listener on
receiving a GST_ERROR_MESSAGE on the bus.

Given the message is immediate and nothing else GStreamer-ish has
happened, I am guessing an initialisation issue. The channel file is
present and works with dvbv5-zap/mplayer. 
 
I am at a loss how to proceed. Advice on finding useful information
gratefully accepted.
-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
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