[Bug 796598] New: x264enc packaged with Ubuntu 18.04 bionic does not work

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796598

            Bug ID: 796598
           Summary: x264enc packaged with Ubuntu 18.04 bionic does not
                    work
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-ugly
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: arnav.dhamija at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I'm running a freshly installed copy of Ubuntu 18.04 with the pre-packaged
GStreamer 1.14.0.

On executing the pipeline: gst-launch-1.0 v4l2src !
video/x-raw,width=640,height=480 ! x264enc !  h264parse ! rtph264pay ! udpsink 

...the output is the following before crashing:

Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data
stream error.
Additional debug info:
gstbasesrc.c(3055): gst_base_src_loop ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming stopped, reason not-negotiated (-4)
Execution ended after 0:00:00.000707635
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

I have verified /dev/video0 is online and supports 480p raw video. The same
pipeline works correctly on my second laptop running Ubuntu 16.04. Lastly,
other pipelines not using x264enc like gst-launch-1.0 v4l2src ! jpegdec !
xvimagesink work fine.

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