[Bug 796862] Videomixer fails with assert if its sink pad offset is set to negative value and the absolute value of offset is greater than pipeline running time

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796862

--- Comment #4 from Yury Mukhitov <muhitov at gmail.com> ---
I’ve drop-in replaced ‘videomixer’ with ‘compositor’. The problem persists.
Please see test application pipeline I’m running (testapp_pipeline.png,
attachment 373147).

=============================
GStreamer console output:
=============================
ERROR:gstvideoaggregator.c:1192:gst_video_aggregator_fill_queues: assertion
failed: (start_time != -1 && end_time != -1)

=============================
Application backtrace:
=============================
#0  0x00007f3b16c291d7 in raise () at /lib64/libc.so.6
#1  0x00007f3b16c2a8c8 in abort () at /lib64/libc.so.6
#2  0x00007f3b18df10c5 in g_assertion_message () at /lib64/libglib-2.0.so.0
#3  0x00007f3b18df115a in g_assertion_message_expr () at
/lib64/libglib-2.0.so.0
#4  0x00007f3b0c256f85 in gst_video_aggregator_fill_queues (vagg=0x13e3960,
output_start_running_time=2133333333, output_end_running_time=2166666667) at
gstvideoaggregator.c:1192
#5  0x00007f3b0c258ebb in gst_video_aggregator_aggregate (agg=0x13e3960,
timeout=0) at gstvideoaggregator.c:1532
#6  0x00007f3b18125f98 in gst_aggregator_aggregate_func (self=0x13e3960) at
gstaggregator.c:1127
#7  0x00007f3b193b36e6 in gst_task_func (task=0x13fa050) at gsttask.c:332
#8  0x00007f3b193b4893 in default_func (tdata=0x13d35b0, pool=0x11fe110) at
gsttaskpool.c:69
#9  0x00007f3b18df28bc in g_thread_pool_thread_proxy () at
/lib64/libglib-2.0.so.0
#10 0x00007f3b18df1f20 in g_thread_proxy () at /lib64/libglib-2.0.so.0
#11 0x00007f3b177dddc5 in start_thread () at /lib64/libpthread.so.0
#12 0x00007f3b16ceb76d in clone () at /lib64/libc.so.6

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