trouble with my audio: intermettent and slow video output

[Giacomo D]

*Hi everyone,
I am developing a pipeline like in the image linked:*

<http://gstreamer-devel.966125.n4.nabble.com/file/n4674133/pipeline.png> 

*When I start my pipeline I get this error like below and video output has a
delay of like 15 seconds before of the beginning.
*

0:00:02.311950508  9718      0x16e54f0 WARN                xcontext
xvcontext.c:496:gst_xvcontext_check_xshm_calls: could not get shared memory
of 4 bytes
0:00:02.319628157  9718      0x16e54f0 WARN                xcontext
xvcontext.c:496:gst_xvcontext_check_xshm_calls: could not get shared memory
of 4 bytes
0:00:02.373980459  9718      0x1b9a1e0 FIXME                default
gstutils.c:3766:gst_pad_create_stream_id_internal:<videotestsrc0:src>
Creating random stream-id, consider implementing a deterministic way of
creating a stream-id


*After the start, the videos run slowly, the audio is intermittent and I get
these errors:*



0:00:16.529630839  9718      0x1bbdca0 FIXME               basesink
gstbasesink.c:3117:gst_base_sink_default_event:<video0> stream-start event
without group-id. Consider implementing group-id handling in the upstream
elements
0:00:16.549355614  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: Stanno per
essere scartati molti buffer.
0:00:16.549403751  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: There may be
a timestamping problem, or this computer is too slow.
0:00:16.555096650  9718      0x1bbe280 WARN         rtpjitterbuffer
rtpjitterbuffer.c:487:calculate_skew: delta - skew: 0:00:13.023766875 too
big, reset skew
0:00:16.746120007  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: Stanno per
essere scartati molti buffer.
0:00:16.746160463  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: There may be
a timestamping problem, or this computer is too slow.
0:00:16.908677214  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: Stanno per
essere scartati molti buffer.
0:00:16.908719256  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: There may be
a timestamping problem, or this computer is too slow.
0:00:17.032863436  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: Stanno per
essere scartati molti buffer.
0:00:17.032905398  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: There may be
a timestamping problem, or this computer is too slow.
0:00:17.165007154  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: Stanno per
essere scartati molti buffer.
0:00:17.165048331  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: There may be
a timestamping problem, or this computer is too slow.
0:00:17.299949715  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: Stanno per
essere scartati molti buffer.
0:00:17.299992032  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: There may be
a timestamping problem, or this computer is too slow.
0:00:17.444542562  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: Stanno per
essere scartati molti buffer.
0:00:17.444585049  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: There may be
a timestamping problem, or this computer is too slow.
0:00:17.596472387  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: Stanno per
essere scartati molti buffer.
0:00:17.596515953  9718      0x1bbde80 WARN                basesink
gstbasesink.c:2846:gst_base_sink_is_too_late:<video4> warning: There may be
a timestamping problem, or this computer is too slow.

*and so on...

Is there something that I do wrong?

Thanks in advance,
Giacomo*








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