Python Gstreamer: Internal data flow error porting program from 0.10 to 1.0

[HM]

Thanks, Shishir. I add the listener to the "pad-added" signal for qtdemux and
try to link the pad with queue:

 def pad_added_handler(self, src, new_pad):
        print("Received new pad {0} from {1}".format(new_pad, src))

        if new_pad.is_linked():
            print ("We are already linked. Ignoring")
            return

        new_pad_type = new_pad.query_caps(None).to_string()
        print ("New pad added of type: {0}".format(new_pad_type))

        ret = new_pad.link(self.queue.get_static_pad("sink"))
        return

But now I'm having "Incompatible pads" with tsdemux and queue:

0:00:01.809406744  9876      0x2b378f0 WARN                 default
descriptions.c:612:format_info_get_desc: Unexpected MPEG-1 layer in
audio/mpeg, mpegversion=(int)1
0:00:01.809443654  9876      0x2b378f0 INFO        GST_ELEMENT_PADS
gstelement.c:897:gst_element_get_static_pad: found pad tsdemux0:sink
0:00:01.809525077  9876      0x2b378f0 INFO               GST_EVENT
gstevent.c:628:gst_event_new_caps: creating caps event video/x-h264,
stream-format=(string)byte-stream, alignment=(string)nal
0:00:01.809591660  9876      0x2b378f0 INFO        GST_ELEMENT_PADS
gstelement.c:646:gst_element_add_pad:<tsdemux0> adding pad 'audio_0041'
Received new pad <Pad object at 0x7fc2591ebaf0 (GstPad at 0x29aba70)> from
<__main__.GstTSDemux object at 0x7fc263a36370 (GstTSDemux at 0x29d0100)>
New pad added of type: audio/mpeg, mpegversion=(int)1
0:00:01.810264717  9876      0x2b378f0 INFO        GST_ELEMENT_PADS
gstelement.c:897:gst_element_get_static_pad: found pad queue0:sink
0:00:01.810389462  9876      0x2b378f0 INFO                GST_PADS
gstpad.c:2120:gst_pad_link_prepare: trying to link tsdemux0:audio_0041 and
queue0:sink
0:00:01.810412086  9876      0x2b378f0 INFO                GST_PADS
gstpad.c:2176:gst_pad_link_prepare: caps are incompatible
0:00:01.810429086  9876      0x2b378f0 INFO               GST_EVENT
gstevent.c:709:gst_event_new_segment: creating segment event time segment
start=0:00:00.000000000, stop=99:99:99.999999999, rate=1,000000,
applied_rate=1,000000, flags=0x00, time=0:00:00.000000000,
base=0:00:00.000000000, position 0:00:00.000000000, duration
99:99:99.999999999
0:00:01.812892209  9876      0x2b378f0 INFO        GST_ELEMENT_PADS
gstelement.c:646:gst_element_add_pad:<tsdemux0> adding pad 'video_0040'
Received new pad <Pad object at 0x7fc2591ebaf0 (GstPad at 0x29abca0)> from
<__main__.GstTSDemux object at 0x7fc263a36370 (GstTSDemux at 0x29d0100)>
New pad added of type: video/x-h264, stream-format=(string)byte-stream,
alignment=(string)nal
0:00:01.813000182  9876      0x2b378f0 INFO        GST_ELEMENT_PADS
gstelement.c:897:gst_element_get_static_pad: found pad queue0:sink
0:00:01.813021020  9876      0x2b378f0 INFO                GST_PADS
gstpad.c:2120:gst_pad_link_prepare: trying to link tsdemux0:video_0040 and
queue0:sink
0:00:01.813047798  9876      0x2b378f0 INFO                GST_PADS
gstpad.c:2176:gst_pad_link_prepare: caps are incompatible
0:00:01.813118214  9876      0x2b378f0 INFO                 basesrc
gstbasesrc.c:2785:gst_base_src_loop:<src> pausing after gst_pad_push() =
not-linked
0:00:01.813134546  9876      0x2b378f0 WARN                 basesrc
gstbasesrc.c:2865:gst_base_src_loop:<src> error: Internal data flow error.
0:00:01.813139330  9876      0x2b378f0 WARN                 basesrc
gstbasesrc.c:2865:gst_base_src_loop:<src> error: streaming task paused,
reason not-linked (-1)
0:00:01.813154141  9876      0x2b378f0 INFO        GST_ERROR_SYSTEM
gstelement.c:1835:gst_element_message_full:<src> posting message: Internal
data flow error.
0:00:01.813175931  9876      0x2b378f0 INFO        GST_ERROR_SYSTEM
gstelement.c:1858:gst_element_message_full:<src> posted error message:
Internal data flow error.
0:00:01.813260218  9876      0x2b378f0 INFO        GST_ELEMENT_PADS
gstelement.c:766:gst_element_remove_pad:<tsdemux0> removing pad 'audio_0041'
0:00:01.813287556  9876      0x2b378f0 INFO        GST_ELEMENT_PADS
gstelement.c:766:gst_element_remove_pad:<tsdemux0> removing pad 'video_0040'
('on_error():', (GError('Internal data flow error.',), 'gstbasesrc.c(2865):
gst_base_src_loop (): /GstPipeline:pipeline0/GstUDPSrc:src:\nstreaming task
paused, reason not-linked (-1)'))
0:00:01.813342610  9876      0x2b378f0 INFO                    task
gsttask.c:300:gst_task_func:<src:src> Task going to paused




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