[Bug 738302] New: x264enc stalls pipeline when tune=zerolatency

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738302
  GStreamer | gst-plugins-ugly | git

           Summary: x264enc stalls pipeline when tune=zerolatency
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-ugly
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: arjen.veenhuizen at tno.nl
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Tuning x264 for zerolatency stalls the pipeline

Working pipeline: gst-launch-1.0 -v videotestsrc pattern=snow !  videorate   !
"video/x-raw,framerate=25/1" ! x264enc  ! fakesink

STDOUT: http://pastebin.com/raw.php?i=N8fHHXMi

Pipeline stalls if we tune the x26enc for zerolatency:
gst-launch-1.0 -v videotestsrc pattern=snow !  videorate   !
"video/x-raw,framerate=25/1" ! x264enc tune=zerolatency ! fakesink

STDOUT: http://pastebin.com/raw.php?i=sTXpmJyf

Expected behaviour: low latency x264 stream
Observed behaviour: stalled pipeline

Both logs are generated with GST_DEBUG=x264*:6

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