ERROR:videomixer2.c:737:gst_videomixer2_fill_queues: assertion failed:
(start_time != -1 && end_time != -1)

        Program received signal SIGABRT, Aborted.
        [Switching to Thread 0x7fff387e8700 (LWP 3033)]
        0x0000003005835a19 in raise () from /lib64/libc.so.6
        Missing separate debuginfos, use: debuginfo-install
        python-2.7.5-1.fc19.x86_64
        (gdb) bt
#0  0x0000003005835a19 in raise () from /lib64/libc.so.6
#1  0x0000003005837128 in abort () from /lib64/libc.so.6
#2  0x00007ffff022b376 in g_assertion_message (domain=domain@entry=0x0, file=file@entry=0x7fffd4a2a2f3 "videomixer2.c", line=line@entry=737, func=func@entry=0x7fffd4a2af20 <__PRETTY_FUNCTION__.18802> "gst_videomixer2_fill_queues", message=<optimized out>) at gtestutils.c:1912
#3  0x00007ffff022b3d4 in g_assertion_message_expr (domain=domain@entry=0x0, file=file@entry=0x7fffd4a2a2f3 "videomixer2.c", line=line@entry=737, func=func@entry=0x7fffd4a2af20 <__PRETTY_FUNCTION__.18802> "gst_videomixer2_fill_queues", expr=expr@entry=0x7fffd4a2ab18 "start_time != -1 && end_time != -1") at gtestutils.c:1923
#4  0x00007fffd4a27981 in gst_videomixer2_fill_queues (output_end_time=66733332, output_start_time=33366666, mix=0xe1aee0) at videomixer2.c:737
#5  gst_videomixer2_collected (pads=<optimized out>, mix=0xe1aee0) at videomixer2.c:1022
#6  0x00007fffed9e8867 in gst_collect_pads_check_collected (pads=0x26e9170) at gstcollectpads.c:1297
#7  0x00007fffed9e9d08 in gst_collect_pads_chain (pad=0x3ac5ce0, parent=<optimized out>, buffer=0x7fff9836feb0) at gstcollectpads.c:2019
#8  0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff9836feb0, type=4112, pad=0x3ac5ce0) at gstpad.c:3718
#9  gst_pad_push_data (pad=pad@entry=0x3b42e50, type=type@entry=4112, data=<optimized out>, data@entry=0x7fff9836feb0) at gstpad.c:3948
#10 0x00007fffee8767a6 in gst_pad_push (pad=pad@entry=0x3b42e50, buffer=buffer@entry=0x7fff9836feb0) at gstpad.c:4051
#11 0x00007fffee861a7b in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x7fff9836feb0) at gstghostpad.c:128
#12 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff9836feb0, type=4112, pad=0x3b486d0) at gstpad.c:3718
#13 gst_pad_push_data (pad=0x3ac0db0, type=type@entry=4112, data=<optimized out>) at gstpad.c:3948
#14 0x00007fffee8767a6 in gst_pad_push (pad=<optimized out>, buffer=<optimized out>) at gstpad.c:4051
#15 0x00007fffed9e20eb in gst_base_transform_chain (pad=<optimized out>, parent=<optimized out>, buffer=<optimized out>) at gstbasetransform.c:2215
#16 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff9836feb0, type=4112, pad=0x3ac0fe0) at gstpad.c:3718
#17 gst_pad_push_data (pad=pad@entry=0x3b48250, type=type@entry=4112, data=<optimized out>, data@entry=0x7fff9836feb0) at gstpad.c:3948
#18 0x00007fffee8767a6 in gst_pad_push (pad=pad@entry=0x3b48250, buffer=buffer@entry=0x7fff9836feb0) at gstpad.c:4051
#19 0x00007fffee861a7b in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x7fff9836feb0) at gstghostpad.c:128
#20 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff9836feb0, type=4112, pad=0x3a4fc90) at gstpad.c:3718
#21 gst_pad_push_data (pad=pad@entry=0x3b48490, type=type@entry=4112, data=<optimized out>, data@entry=0x7fff9836feb0) at gstpad.c:3948
#22 0x00007fffee8767a6 in gst_pad_push (pad=pad@entry=0x3b48490, buffer=buffer@entry=0x7fff9836feb0) at gstpad.c:4051
#23 0x00007fffee861a7b in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x7fff9836feb0) at gstghostpad.c:128
#24 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff9836feb0, type=4112, pad=0x3a4f7d0) at gstpad.c:3718
#25 gst_pad_push_data (pad=pad@entry=0x3b48910, type=type@entry=4112, data=<optimized out>, data@entry=0x7fff9836feb0) at gstpad.c:3948
#26 0x00007fffee8767a6 in gst_pad_push (pad=pad@entry=0x3b48910, buffer=buffer@entry=0x7fff9836feb0) at gstpad.c:4051
#27 0x00007fffee861a7b in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x7fff9836feb0) at gstghostpad.c:128
#28 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff9836feb0, type=4112, pad=0x3b430b0) at gstpad.c:3718
#29 gst_pad_push_data (pad=pad@entry=0x7fffb8019d10, type=type@entry=4112, data=<optimized out>, data@entry=0x7fff9836feb0) at gstpad.c:3948
#30 0x00007fffee8767a6 in gst_pad_push (pad=pad@entry=0x7fffb8019d10, buffer=buffer@entry=0x7fff9836feb0) at gstpad.c:4051
#31 0x00007fffee861a7b in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x7fff9836feb0) at gstghostpad.c:128
#32 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff9836feb0, type=4112, pad=0x7fffd013d210) at gstpad.c:3718
#33 gst_pad_push_data (pad=pad@entry=0x276a320, type=type@entry=4112, data=<optimized out>, data@entry=0x7fff9836feb0) at gstpad.c:3948
#34 0x00007fffee8767a6 in gst_pad_push (pad=pad@entry=0x276a320, buffer=buffer@entry=0x7fff9836feb0) at gstpad.c:4051
#35 0x00007fffee861a7b in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x7fff9836feb0) at gstghostpad.c:128
#36 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff9836feb0, type=4112, pad=0x7fff98016270) at gstpad.c:3718
#37 gst_pad_push_data (pad=0x7fff980104d0, type=type@entry=4112, data=<optimized out>) at gstpad.c:3948
#38 0x00007fffee8767a6 in gst_pad_push (pad=<optimized out>, buffer=<optimized out>) at gstpad.c:4051
#39 0x00007fffed9e20eb in gst_base_transform_chain (pad=<optimized out>, parent=<optimized out>, buffer=<optimized out>) at gstbasetransform.c:2215
#40 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fffd80b6390, type=4112, pad=0x7fff980102a0) at gstpad.c:3718
#41 gst_pad_push_data (pad=pad@entry=0x7fffb8018c70, type=type@entry=4112, data=<optimized out>, data@entry=0x7fffd80b6390) at gstpad.c:3948
#42 0x00007fffee8767a6 in gst_pad_push (pad=pad@entry=0x7fffb8018c70, buffer=buffer@entry=0x7fffd80b6390) at gstpad.c:4051
#43 0x00007fffee861a7b in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x7fffd80b6390) at gstghostpad.c:128
#44 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fffd80b6390, type=4112, pad=0x7fffd013c010) at gstpad.c:3718
#45 gst_pad_push_data (pad=pad@entry=0x7fff68015990, type=type@entry=4112, data=<optimized out>, data@entry=0x7fffd80b6390) at gstpad.c:3948
#46 0x00007fffee8767a6 in gst_pad_push (pad=pad@entry=0x7fff68015990, buffer=buffer@entry=0x7fffd80b6390) at gstpad.c:4051
#47 0x00007fffee861a7b in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x7fffd80b6390) at gstghostpad.c:128
#48 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fffd80b6390, type=4112, pad=0x7fff8c06fb10) at gstpad.c:3718
#49 gst_pad_push_data (pad=0x7fffbc2ab3b0, type=type@entry=4112, data=<optimized out>, data@entry=0x7fffd80b6390) at gstpad.c:3948
#50 0x00007fffee8767a6 in gst_pad_push (pad=<optimized out>, buffer=buffer@entry=0x7fffd80b6390) at gstpad.c:4051
#51 0x00007fffede2fc6f in gst_video_decoder_clip_and_push_buf (decoder=decoder@entry=0x7fffd0004000, buf=buf@entry=0x7fffd80b6390) at gstvideodecoder.c:2578
#52 0x00007fffede36a4d in gst_video_decoder_finish_frame (decoder=0x7fffd0004000, frame=0x0, frame@entry=0x7fff640bec50) at gstvideodecoder.c:2493
#53 0x00007fffcae772d3 in handle_slice (info=<optimized out>, mpeg2dec=<optimized out>) at gstmpeg2dec.c:936
#54 gst_mpeg2dec_handle_frame (decoder=0x7fffd0004000, frame=0x7fffd81094a0) at gstmpeg2dec.c:1029
#55 0x00007fffede2f399 in gst_video_decoder_decode_frame (decoder=decoder@entry=0x7fffd0004000, frame=0x7fffd81094a0) at gstvideodecoder.c:2753
#56 0x00007fffede31aa3 in gst_video_decoder_chain_forward (decoder=decoder@entry=0x7fffd0004000, buf=buf@entry=0x7fff941043f0, at_eos=at_eos@entry=0) at gstvideodecoder.c:1756
#57 0x00007fffede33113 in gst_video_decoder_chain (pad=<optimized out>, parent=<optimized out>, buf=0x7fff941043f0) at gstvideodecoder.c:2003
#58 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff941043f0, type=4112, pad=0x7fffbc2ab5e0) at gstpad.c:3718
#59 gst_pad_push_data (pad=0x7fffc00513e0, type=type@entry=4112, data=<optimized out>, data@entry=0x7fff941043f0) at gstpad.c:3948
#60 0x00007fffee8767a6 in gst_pad_push (pad=<optimized out>, buffer=buffer@entry=0x7fff941043f0) at gstpad.c:4051
#61 0x00007fffed9c410f in gst_base_parse_push_frame (parse=parse@entry=0x7fffc0052800, frame=frame@entry=0x7fffd0002400) at gstbaseparse.c:2210
#62 0x00007fffed9c7ac3 in gst_base_parse_handle_and_push_frame (frame=0x7fffd0002400, parse=0x7fffc0052800) at gstbaseparse.c:2032
#63 gst_base_parse_finish_frame (parse=parse@entry=0x7fffc0052800, frame=frame@entry=0x7fffd0002400, size=size@entry=2200) at gstbaseparse.c:2336
#64 0x00007fffc8dc6486 in gst_mpegv_parse_handle_frame (parse=0x7fffc0052800, frame=0x7fffd0002400, skipsize=<optimized out>) at gstmpegvideoparse.c:696
#65 0x00007fffed9c1aa0 in gst_base_parse_handle_buffer (parse=parse@entry=0x7fffc0052800, buffer=<optimized out>, skip=skip@entry=0x7fff387e7bec, flushed=flushed@entry=0x7fff387e7bf0) at gstbaseparse.c:1886
#66 0x00007fffed9c4f9a in gst_base_parse_chain (pad=<optimized out>, parent=<optimized out>, buffer=<optimized out>) at gstbaseparse.c:2755
#67 0x00007fffee86f935 in gst_pad_chain_data_unchecked (data=0x7fff941e2bb0, type=4112, pad=0x7fffc0050030) at gstpad.c:3718
#68 gst_pad_push_data (pad=0x7fffac163d10, type=type@entry=4112, data=<optimized out>, data@entry=0x7fff941e2bb0) at gstpad.c:3948
#69 0x00007fffee8767a6 in gst_pad_push (pad=<optimized out>, buffer=buffer@entry=0x7fff941e2bb0) at gstpad.c:4051
#70 0x00007fffe9af6c21 in gst_single_queue_push_one (object=0x7fff941e2bb0,
                sq=0x7fffc0052100, mq=0x7fff88309c70) at gstmultiqueue.c:1059
#71 gst_multi_queue_loop (pad=<optimized out>) at gstmultiqueue.c:1307
#72 0x00007fffee89d4b9 in gst_task_func (task=0x7fff94293b40) at gsttask.c:316
#73 0x00007ffff022c2f6 in g_thread_pool_thread_proxy (data=<optimized out>) at
gthreadpool.c:309
#74 0x00007ffff022b935 in g_thread_proxy (data=0x7fffa0008990) at gthread.c:798
#75 0x0000003006007c53 in start_thread () from /lib64/libpthread.so.0
#76 0x00000030058f513d in clone () from /lib64/libc.so.6