Flush RTSP pipeline

[allopez]

Hello everyone,

I am using the next pipeline to connect to a IP camera, which sends
MJPEG video through it:

rtspsrc name=rtspsrc ! queue ! rtpjpegdepay ! ffdec_mjpeg ! xvimagesink
name=videosink

e.g. URI = rtsp://192.168.0.25/live.sdp

I would like to know how to flush correctly the pipeline when I get the
end-of-stream message in the GstBus (GST_MESSAGE_EOS).

Currently, I set the pipeline to NULL and open it again:

gst_element_set_state (gstPipeline, GST_STATE_NULL);
gst_object_unref(gstPipeline);

[...]

gstPipeline = gst_pipeline_new (NULL);
gstPipeline = gst_parse_launch(m_sGstLaunch,&error);

The main problem is the IP camera is also closing more connections I
need to work when I do this.

Thanks in advance,

Alvaro


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[allopez]

Hi,

I discovered I could flush the pipeline using:

gst_element_seek(pipeline,1.0, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH,GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_NONE, 0);

As I am using some cameras, I perform the seek before moving from GST_STATE_PAUSED to GST_STATE_PLAYING states. I am not receiving the GST_MESSAGE_EOS now.

Also, I divided the pipeline bus processing into some callbacks:

gst_bus_add_signal_watch(bus);
g_signal_connect(bus, "message::state-changed", G_CALLBACK(gst_state_changed_cb), this);
g_signal_connect(bus, "message::element", G_CALLBACK(gst_element_cb), this);
g_signal_connect(bus, "message::error", G_CALLBACK(gst_error_cb), this);
g_signal_connect(bus, "message::eos", G_CALLBACK(gst_eos_cb), this);
gst_object_unref (bus);

This way I can perform another flush in the pipeline when I get the GST_MESSAGE_STATE_CHANGED in the pipeline object when it moves from GST_STATE_PLAYING to GST_STATE_PAUSED. In this case, the transition between playing one camera to another is quite perfect. Furthermore, I have detected some strange effects I don´t know how to solve if the stream is played at 640x360:

1º/ If I move from one camera to another I get the CPU working nearly at 100% in a random time. Also, the application uses too much memory. Maybe memory leaks in gst_element_seek ???

2º/ Sometimes the seek ends in a complete lock of my application --> Backtrace:

#0  0xb6cdcc14 in __lll_lock_wait () from /lib/libpthread.so.0
#1  0xb6cd81bd in _L_lock_748 () from /lib/libpthread.so.0
#2  0xb6cd7fe1 in pthread_mutex_lock () from /lib/libpthread.so.0
#3  0xb6e8883e in g_static_rec_mutex_lock () from /lib/libglib-2.0.so.0
#4  0xb676a337 in gst_rtspsrc_perform_seek (pad=0xb41df10c, event=0x1164ab50) at gstrtspsrc.c:1865
#5  gst_rtspsrc_handle_src_event (pad=0xb41df10c, event=0x1164ab50) at gstrtspsrc.c:1987
#6  0xb70c6b72 in gst_pad_send_event (pad=0x824d540, event=0x1164ab50) at gstpad.c:5425
#7  0xb70c71ee in gst_pad_push_event (pad=0x823fb28, event=0x1164ab50) at gstpad.c:5277
#8  0xb66a157f in gst_queue_handle_src_event (pad=0xb41dfd80, event=0x1164ab50) at gstqueue.c:1313
#9  0xb70c6b72 in gst_pad_send_event (pad=0xb41dfd80, event=0x1164ab50) at gstpad.c:5425
#10 0xb70c71ee in gst_pad_push_event (pad=0x823f808, event=0x1164ab50) at gstpad.c:5277
#11 0xb70c7892 in gst_pad_event_default_dispatch (pad=0x823fd80, event=0x1164ab50) at gstpad.c:3586
#12 gst_pad_event_default (pad=0x823fd80, event=0x1164ab50) at gstpad.c:3663
#13 0xb70c6b72 in gst_pad_send_event (pad=0x823fd80, event=0x1164ab50) at gstpad.c:5425
#14 0xb70c71ee in gst_pad_push_event (pad=0x823fcb8, event=0x1164ab50) at gstpad.c:5277
#15 0xb5b37545 in gst_ffmpegdec_src_event (pad=0x823fbf0, event=0x1164ab50) at gstffmpegdec.c:559
#16 0xb70c6b72 in gst_pad_send_event (pad=0x823fbf0, event=0x1164ab50) at gstpad.c:5425
#17 0xb70c71ee in gst_pad_push_event (pad=0xb41dfbf0, event=0x1164ab50) at gstpad.c:5277
#18 0xb67166bb in gst_base_sink_send_event (element=0xb4123be8, event=0x1164ab50) at gstbasesink.c:4526
#19 0xb70a621e in gst_element_send_event (element=0xb4123be8, event=0x1164ab50) at gstelement.c:1667
#20 0xb7092928 in gst_bin_send_event (element=0xb41ddc88, event=0x1164ab50) at gstbin.c:2703
#21 0xb70a621e in gst_element_send_event (element=0xb41ddc88, event=0x1164ab50) at gstelement.c:1667
#22 0xb70a6337 in gst_element_seek (element=0xb41ddc88, rate=1, format=GST_FORMAT_TIME, flags=GST_SEEK_FLAG_FLUSH, cur_type=GST_SEEK_TYPE_SET, cur=0,
    stop_type=GST_SEEK_TYPE_NONE, stop=0) at gstelement.c:1707

What could I do to solve these problems ???

Thanks in advance