[Dev] remove element dynamic pipelines

hongming0724 at 163.com hongming0724 at 163.com
Wed Sep 9 10:23:24 GMT 2015

Hi all,
     I use tee element for dual video output and my pipeline like this :

                         / [ queue1 | v4l2sink1]   branch 1
                        \ [ queue2 | v4l2sink2]    branch 2
Now I want to remove v4l2sink1 and add it to pipeline again. First, 
blockpad = gst_element_get_static_pad(queue1,NULL);
gst_pad_add_probe (blockpad , (GstPadProbeType)GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM , pad_probe_cb, user_data, NULL);
gst_pad_remove_probe (blockpad , GST_PAD_PROBE_INFO_ID (info));

And then, in the callback pad_probe_cb() ,

sinkpad = gst_element_get_static_pad (v4l2sink1, "sink");
gst_pad_send_event (sinkpad, gst_event_new_eos ());
gst_pad_remove_probe (sinkpad, GST_PAD_PROBE_INFO_ID (info));
gst_element_set_state (v4l2sink1, GST_STATE_NULL);
gst_bin_remove (GST_BIN (pipeline),v4l2sink1);

Problems has occured that neither branch1 nor branch2  has no videos on screen with the pipeline is playing and the audio output is ok.
It seems that the videostreams was block by adding a probe .    At the same time , the branch2 seems receive block message too.
Pls tell me how to fix this problem .Any reply is appreciated .
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