[Bug 795554] New: gst-launch stalls when attempting to exit after playing back audio or video file

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795554

            Bug ID: 795554
           Summary: gst-launch stalls when attempting to exit after
                    playing back audio or video file
    Classification: Platform
           Product: GStreamer
           Version: 1.12.4
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: dsi.maillist at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 371397
  --> https://bugzilla.gnome.org/attachment.cgi?id=371397&action=edit
H.264 encoded MP4 file that is 4.7 seconds long and has 141 frames

I am having trouble using gst-launch on Debian 9 (Gstreamer version 1.10.4)
with MP4 files. I have experienced the same issue in Ubuntu 18.04 which I
believe runs 1.12.x.

I have not observed this when using Gstreamer 1.4.4

I have been able to reproduce this when playing MP4, MPG, Uncompressed AVI and
even an MP3 file.

Here is the pipeline I am using below to play video files:
gst-launch-1.0 playbin uri=file://xylophone.mp4 video-sink=appsink

I get: 
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Redistribute latency...
Redistribute latency...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock

The file duration is 4.7 seconds. Even after say 10 seconds, the gst-launch
command does not exit unlike in 1.4.4.

After that when I execute Ctrl+C, I see the following on the screen:^C handling
interrupt.

Interrupt: Stopping pipeline ...Execution ended after 0:02:39.636421528Setting
pipeline to PAUSED ...

Again the system stalls and the stack trace looks like:
https://drive.google.com/open?id=1MzKpg-eIKCZQhs7fkGoFmB3L0t-72GUw

The stall appears to happen when pipeline is being moved from PLAYING->PAUSED.

When I switch the video-sink to xvimagesink or fakesink, it works fine.

This is similar to a stall I get when I am using my application to read frames
out of a video file and I am attempting to shutdown my video reading portion by
setting the pipeline to NULL.

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