[Bug 711710] New: Sticky events tags are frequently missing data (compared to input-selector pad "tags" property)

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=711710
  GStreamer | gstreamer (core) | git

           Summary: Sticky events tags are frequently missing data
                    (compared to input-selector pad "tags" property)
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: self at brendanlong.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=259301)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=259301)
Program which listens for x-tags-changed events on playbin, then compares
sticky tag events and "tag" property

I'm attaching a program for testing this.

Here's some example output:

$ gst-git ./flakey-tags.py
https://trac.webkit.org/export/158942/trunk/LayoutTests/media/content/counting-subtitled-srt.mkv
text pad 0 got tags:
input-selector pad tags: taglist, language-code=(string)fr;
sticky event tags: taglist;

text pad 1 got tags:
input-selector pad tags: taglist, language-code=(string)fr,
container-format=(string)Matroska;
sticky event tags: taglist, language-code=(string)fr;

text pad 0 got tags:
input-selector pad tags: taglist, language-code=(string)en;
sticky event tags: taglist;

text pad 1 got tags:
input-selector pad tags: taglist, language-code=(string)en,
container-format=(string)Matroska;
sticky event tags: taglist, language-code=(string)en;

EOS

Notice how pad 0's input-selector pad "tag" property shows the language
correctly, but the sticky events never show anything.

With pad 0 there's still a problem, since the container-format isn't showing up
in the sticky events.

I'm guessing what's happening is that the tag sticky events are getting cleared
or replaced, which doesn't matter to the input-selector pad since it just
merges tags as it sees them and never clears it.

This causes problems because there's basically no reliable way to intercept
tags with a pad probe, which I'd like to do here:
https://bugs.webkit.org/show_bug.cgi?id=124020

Some interesting files to run this program on:

Text and video:
https://trac.webkit.org/export/158942/trunk/LayoutTests/media/content/counting-subtitled-srt.mkv
Audio and video:
https://trac.webkit.org/export/158943/trunk/LayoutTests/media/content/two-audio-and-video-tracks.mkv

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