[Bug 679462] playbin: improve error message when plugins are missing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=679462

Tim-Philipp Müller <t.i.m at zen.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|0.11.x                      |git master
            Summary|playbin: error reporting    |playbin: improve error
                   |lacks important details     |message when plugins are
                   |                            |missing
         Whiteboard|                            |newcomer
           Severity|minor                       |enhancement

--- Comment #3 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
playbin (or at least playbin3 at this point) should intercept any missing
plugin messages that were sent, and create one error message that contains a
list of missing plugins. It should get the descriptions of the missing plugins
(e.g. "MP3 audio decoder") from the description API in pbutils.

Maybe it can also be done by just peeking at caps of unsupported streams in
playbin3 (not sure right now how streams for which decoders are missing are
exposed/handled in decodebin3/playbin3).

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