[Bug 785104] New: multiple instances of omxmjpegdec seems not work well

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785104

            Bug ID: 785104
           Summary: multiple instances of omxmjpegdec seems not work well
    Classification: Platform
           Product: GStreamer
           Version: 1.12.2
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-omx
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: HHG01200 at nifty.ne.jp
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I'm not sure whether it is a problem of GStreamer or not. 
On Raspberry Pi3, multiple instances of omxmjpegdec seems not work well at the
same time.

How to reproduce:
Use 2 of separate Terminals and a Photo JPEG movie file.
(I used 640x480 30fps)

On the one Terminal:
 gst-launch-1.0 filesrc location=/home/pi/Videos/Fish.mov ! decodebin !
glimagesink

On the other Terminal:
 gst-launch-1.0 filesrc location=/home/pi/Videos/Fish.mov ! decodebin !
videocrop bottom=100 ! glimagesink

(NOTE: videocrop is used to show first (background) video)

Result:
 These movies are not played well, and many "Frame is too late" messages are
shown (GST_DEBUG=2).
---------------------------------------------------------------------
omxvideodec
gstomxvideodec.c:1387:gst_omx_video_dec_loop:<omxmjpegdec-omxmjpegdec0> Frame
is too late, dropping
---------------------------------------------------------------------

On 1.12.0, same problem was seen.
I saw a message from gst_omx_port_wait_enabled_unlocked() several times,
but since updated to 1.12.2, not yet seen.
---------------------------------------------------------------------
Timeout waiting for ... port ... to be enabled
---------------------------------------------------------------------


The combination of a Photo JPEG and a H.264 movie files is no problem.
Also, the combination of two H.264 movie files is no problem.
2 instances of omxplayer also works well for same (used in above test) Photo
JPEG movie file.

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