[Bug 780592] New: decodebin3 does not link audio tracks

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=780592

            Bug ID: 780592
           Summary: decodebin3 does not link audio tracks
    Classification: Platform
           Product: GStreamer
           Version: 1.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: tom at r.je
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Apologies, I'm only just starting to learn gstreamer so I'm sorry for the poor
explanatioin, however the following command works:

```
gst-launch-1.0 filesrc location=file.ts ! decodebin name=bin ! queue !
videoconvert ! x264enc ! mpegtsmux name=mux ! autovideosink ! queue !
audioconvert ! faac ! mux.

```


But replacing decodebin with decodebin3 does not and hangs at "Redistribute
latency..." if both the audio and video components are part of the stream.


The following pipeline works as expected:

```
gst-launch-1.0 filesrc location=file.ts ! decodebin3 name=bin ! queue !
videoconvert ! x264enc ! mpegtsmux name=mux ! hlssink
```

But only includes video in the output. Debug output produces the following:

```
0:00:00.023618299 17980 0x7ff82c054b70 WARN                 default
descriptions.c:744:format_info_get_desc: Unexpected MPEG-1 layer in audio/mpeg,
mpegversion=(int)1
0:00:00.023725676 17980 0x7ff82c054b70 FIXME             decodebin3
gstdecodebin3.c:967:update_requested_selection:<bin> Implement EXPOSE_ALL_MODE

```

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