parole fails to play iptv streams with teletext

Submitted by Tim Tassonis

Assigned to Simon Steinbeiß @ochosi

Link to original bug (#15864)

Description

I have successfully built parole 1.0.4 with gstreamer-1.16.0 and it runs fine.

However, it refuses to play iptv streams containing teletext, while gst-play-1.0 plays them fine,

For example:

gst-play-1.0 http://192.168.219.1:4022/udp/239.77.0.77:5000

will only warn about the missing teletext decoder:

WARNING No decoder available for type 'application/x-teletext'.
WARNING debug information: ../gst/playback/gsturidecodebin.c(921): unknown_type_cb (): /GstPlayBin:playbin/GstURIDecodeBin:uridecodebin0

but still play the stream, while parole wil display a popup telling about the missing decoder and then refuse to play the stream.

It would be great if parole could also play the stream if the teletext decoder is not available, as other players like gst-play-1.0 or mpv.

Version: 1.0.4