[Bug 796862] New: Videomixer fails with assert if pad offset is negative and its absolute value is greater than the pipeline running time

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 796862
           Summary: Videomixer fails with assert if pad offset is negative
                    and its absolute value is greater than the pipeline
                    running time
    Classification: Platform
           Product: GStreamer
           Version: 1.14.2
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: muhitov at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Expected behavior: Setting pad offset to negative value usually results in
media stream being "shifted forward" by the amout of offset.

Observed behavior: If setting pad offset to negative value which absolute value
is greater than the pipeline running time videomixer fails with assert.

Pipeline structure:
$ gst-launch-1.0 videotestsrc ! videomixer ! ximagesink

How to reproduce:
Have pipeline running for N seconds then set videomixer's pad offset to -(N+1)
seconds (e.g. to skip some video frames).

I have an example application which reproduces this problem.

Regards,
Yury

=============================
GStreamer console output:
=============================
ERROR:videomixer2.c:961:gst_videomixer2_fill_queues: assertion failed:
(start_time != -1 && end_time != -1)

=============================
Application backtrace:
=============================
#0  0x00007f27370201d7 in raise () at /lib64/libc.so.6
#1  0x00007f27370218c8 in abort () at /lib64/libc.so.6
#2  0x00007f27391d50c5 in g_assertion_message () at /lib64/libglib-2.0.so.0
#3  0x00007f27391d515a in g_assertion_message_expr () at
/lib64/libglib-2.0.so.0
#4  0x00007f272c879f1e in gst_videomixer2_fill_queues (mix=0x26b00c0,
output_start_time=2100000000, output_end_time=2133333333)
    at videomixer2.c:961
#5  0x00007f272c87b53a in gst_videomixer2_collected (pads=0x26b20d0,
mix=0x26b00c0) at videomixer2.c:1285
#6  0x00007f273855ca1e in gst_collect_pads_check_collected (pads=0x26b20d0) at
gstcollectpads.c:1368
#7  0x00007f273855eadd in gst_collect_pads_chain (pad=0x26b82d0,
parent=0x26b00c0, buffer=0x7f271c0313e0) at gstcollectpads.c:2216
#8  0x00007f2739756b53 in gst_pad_chain_data_unchecked (pad=0x26b82d0,
type=4112, data=0x7f271c0313e0) at gstpad.c:4205
#9  0x00007f2739757732 in gst_pad_push_data (pad=0x26ac040, type=4112,
data=0x7f271c0313e0) at gstpad.c:4457
#10 0x00007f2739757e00 in gst_pad_push (pad=0x26ac040, buffer=0x7f271c0313e0)
at gstpad.c:4576
#11 0x00007f2738546d4d in gst_base_src_loop (pad=0x26ac040) at
gstbasesrc.c:2854
#12 0x00007f27397924b9 in gst_task_func (task=0x26c8050) at gsttask.c:334
#13 0x00007f273979365a in default_func (tdata=0x26b3010, pool=0x24e2910) at
gsttaskpool.c:68
#14 0x00007f27391d68bc in g_thread_pool_thread_proxy () at
/lib64/libglib-2.0.so.0
#15 0x00007f27391d5f20 in g_thread_proxy () at /lib64/libglib-2.0.so.0
#16 0x00007f2737bd4dc5 in start_thread () at /lib64/libpthread.so.0
#17 0x00007f27370e276d in clone () at /lib64/libc.so.6

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