[Bug 784063] New: appsink hangs if sync is true

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784063

            Bug ID: 784063
           Summary: appsink hangs if sync is true
    Classification: Platform
           Product: GStreamer
           Version: 1.8.2
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: dashesy at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This happens sporadically and in a slow VM (just connecting multifilesrc to
appsink):

  thread #6: tid = 41178, 0x00007fe29b600c21
libc.so.6`__GI_ppoll(fds=0x00007fe27c043ac0, nfds=1, timeout=<unavailable>,
sigmask=0x0000000000000000) + 145 at ppoll.c:50, name = 'multifilesrc0:s', stop
reason = signal SIGSTOP
    frame #0: 0x00007fe29b600c21 libc.so.6`__GI_ppoll(fds=0x00007fe27c043ac0,
nfds=1, timeout=<unavailable>, sigmask=0x0000000000000000) + 145 at ppoll.c:50
    frame #1: 0x00007fe2a5e0e818 libgstreamer-1.0.so.0`gst_poll_wait + 1784
    frame #2: 0x00007fe2a5e24eb1 libgstreamer-1.0.so.0`??? + 145
    frame #3: 0x00007fe2a5dd3dfb libgstreamer-1.0.so.0`gst_clock_id_wait + 91
    frame #4: 0x00007fe2a60dcadc libgstbase-1.0.so.0`gst_base_sink_wait_clock +
332
    frame #5: 0x00007fe2a60ddf80 libgstbase-1.0.so.0`??? + 1824
    frame #6: 0x00007fe2a60defb2 libgstbase-1.0.so.0`??? + 1938
    frame #7: 0x00007fe2a60e0620 libgstbase-1.0.so.0`??? + 240
    frame #8: 0x00007fe2a5df954f libgstreamer-1.0.so.0`??? + 1935
    frame #9: 0x00007fe2a5e01483 libgstreamer-1.0.so.0`gst_pad_push + 275
    frame #10: 0x00007fe2a60ea47d libgstbase-1.0.so.0`??? + 397
    frame #11: 0x00007fe2a5df954f libgstreamer-1.0.so.0`??? + 1935
    frame #12: 0x00007fe2a5e01483 libgstreamer-1.0.so.0`gst_pad_push + 275
    frame #13: 0x00007fe2a5dea513
libgstreamer-1.0.so.0`gst_proxy_pad_chain_default + 179
    frame #14: 0x00007fe2a5df954f libgstreamer-1.0.so.0`??? + 1935
    frame #15: 0x00007fe2a5e01483 libgstreamer-1.0.so.0`gst_pad_push + 275
    frame #16: 0x00007fe2a3eab8df libgstvideo-1.0.so.0`??? + 3167
    frame #17: 0x00007fe2a3eb2110
libgstvideo-1.0.so.0`gst_video_decoder_finish_frame + 512
    frame #18: 0x00007fe2833f46d3 libgstjpeg.so
    frame #19: 0x00007fe2a3eaa4c6 libgstvideo-1.0.so.0`??? + 422
    frame #20: 0x00007fe2a3eaa97d libgstvideo-1.0.so.0`??? + 157
    frame #21: 0x00007fe2a3ead173 libgstvideo-1.0.so.0`??? + 755
    frame #22: 0x00007fe2a5df954f libgstreamer-1.0.so.0`??? + 1935
    frame #23: 0x00007fe2a5e01483 libgstreamer-1.0.so.0`gst_pad_push + 275
    frame #24: 0x00007fe2a5df954f libgstreamer-1.0.so.0`??? + 1935
    frame #25: 0x00007fe2a5e01483 libgstreamer-1.0.so.0`gst_pad_push + 275
    frame #26: 0x00007fe2a5dea513
libgstreamer-1.0.so.0`gst_proxy_pad_chain_default + 179
    frame #27: 0x00007fe2a5df954f libgstreamer-1.0.so.0`??? + 1935
    frame #28: 0x00007fe2a5e01483 libgstreamer-1.0.so.0`gst_pad_push + 275
    frame #29: 0x00007fe2a60e5da5 libgstbase-1.0.so.0`??? + 1013
    frame #30: 0x00007fe2a5e2be71 libgstreamer-1.0.so.0`??? + 401
    frame #31: 0x00007fe29ebfd55e libglib-2.0.so.0`??? + 158
    frame #32: 0x00007fe29ebfcbc5 libglib-2.0.so.0`??? + 85
    frame #33: 0x00007fe29ca936ba libpthread.so.0`start_thread + 202
    frame #34: 0x00007fe29b60c82d libc.so.6`__clone + 109 at clone.S:109


If I set "sync=false" for appsink, the problem is resolved.

The error looks similar to this:
https://lists.freedesktop.org/archives/gstreamer-bugs/2015-February/141581.html
which specifies Bug #737427

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