>
> I try to create a picture in picture channel to the main pipeline.
> I read this post and succeeded to create PIP channel dynamically.
> (
http://gstreamer-devel.966125.n4.nabble.com/Dynamically-adding-and-removing-branches-of-a-tee-td973635.html#a973637)
> However, while I attempt to release the PIP channel while the main
> pipeline is still running, the main pipeline stops to refresh video
> frames.
> I cannot figure out the reason why main pipeline stops.
> Could anyone help me to solve the problem?
>
> Here is my pipeline looks like:
>
>
> / (main pipeline)queue - videomixer - videoscale - videocrop - caps -
> videosink
> tee
> /
> \ (pip branch ) queue - videoscale - videocrop - caps ------ mix
> -----/
>
>
> the following code shows how I unlink pip branch from tee and videomixer
>
> void CPiPChannel::Unlink(void) {
> gst_pad_set_blocked_async(m_pVideoTeeSrcPad, TRUE, (GstPadBlockCallback)
> PadBlockHandler, m_pVideoTee);
> gst_element_remove_pad(m_pVideoMixer, m_pVideoMixerSinkPad);
> }
>
> void CPiPChannel::PadBlockHandler(GstPad* pPad, gboolean bBlocked,
> gpointer pData)
> {
> GstPad* pPeer = NULL;
> GstEvent* pEvent = NULL;
> GstElement* pTee = NULL;
>
> if(bBlocked) {
> pPeer = gst_pad_get_peer(pPad);
> pEvent = gst_event_new_eos();
> pTee = (CPiPChannel*) pData;
>
> if(gst_pad_unlink(pPad, pPeer);
> dprintf("unlink pad success");
> else
> dprintf("unlink pad failed");
>
> gst_element_set_state(pBin, GST_STATE_READY);
> gst_element_set_state(pBin, GST_STATE_NULL);
>
> gst_pad_push_event(pPeer, pEvent);
> gst_pad_set_blocked_async(pPad, FALSE, (GstPadBlockCallback)
> PadBlockHandler, pData);
> gst_element_remove_pad(pTee, pPad);
> gst_object_unref(pPad);
> } else {
> dprintf("unblocked");
> }
> }
>
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