Gstreamer h264 udp stream is to laggy

[kingalione]

Hello, I'm very new in gstreamer and have a problem:

I'm using gstreamer to stream a h264 encoded udp stream to an iPad. It works
but there is one big problem. The stream is way to laggy. I mean if I do
something in front of the camera, I see it on the iPad after 3-6 Seconds
which is way to much. 


this is how my pipeline looks:

sudo gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,
width=3072,height=2048,framerate=15/1 ! videoconvert ! queue ! videoscale !
video/x-raw, width=600,height=450,framerate=15/1 ! x264enc tune=zerolatency
speed-preset=ultrafast bitrate=500 ! queue ! rtph264pay config-interval=2
pt=96 ! udpsink host=192.168.178.141 port=5000


The camera is plugged-in to a intel nuc celeron and if I run the pipeline I
get about 80% processor usage on both cores. 


I use this camera to stream:

sudo v4l2-ctl --all

Driver Info (not using libv4l2):
	Driver name   : uvcvideo
	Card type     : DFK 33UX178
	Bus info      : usb-0000:00:14.0-1
	Driver version: 3.16.7
	Capabilities  : 0x84000001
		Video Capture
		Streaming
		Device Capabilities
	Device Caps   : 0x04000001
		Video Capture
		Streaming
Priority: 2
Video input : 0 (Camera 1: ok)
Format Video Capture:
	Width/Height  : 3072/2048
	Pixel Format  : 'YUYV'
	Field         : None
	Bytes per Line: 6144
	Size Image    : 12582912
	Colorspace    : Unknown (00000000)
Crop Capability Video Capture:
	Bounds      : Left 0, Top 0, Width 3072, Height 2048
	Default     : Left 0, Top 0, Width 3072, Height 2048
	Pixel Aspect: 1/1
Streaming Parameters Video Capture:
	Capabilities     : timeperframe
	Frames per second: 15.000 (15/1)
	Read buffers     : 0
                     brightness (int)    : min=0 max=4095 step=1 default=200
value=333
                     saturation (int)    : min=0 max=255 step=1 default=64
value=240
                            hue (int)    : min=-180 max=180 step=1 default=0
value=0
   white_balance_component_auto (bool)   : default=1 value=0
    white_balance_red_component (int)    : min=0 max=255 step=1 default=64
value=112
   white_balance_blue_component (int)    : min=0 max=255 step=1 default=64
value=136
                          gamma (int)    : min=1 max=500 step=1 default=100
value=100
                           gain (int)    : min=0 max=480 step=1 default=0
value=0
               exposure_time_us (int)    : min=20 max=60000000 step=1
default=333 value=50000
                   auto_shutter (bool)   : default=1 value=0
        auto_exposure_reference (int)    : min=0 max=255 step=1 default=128
value=128
                      gain_auto (bool)   : default=1 value=0
                   trigger_mode (bool)   : default=0 value=0
               software_trigger (button) : flags=write-only
                  trigger_delay (int)    : min=0 max=1000000 step=1
default=0 value=31
                  strobe_enable (bool)   : default=0 value=0
                strobe_polarity (bool)   : default=0 value=0
                strobe_exposure (bool)   : default=1 value=1
                strobe_duration (int)    : min=0 max=32767 step=1
default=100 value=100
                   strobe_delay (int)    : min=0 max=32767 step=1 default=0
value=0
                          gpout (bool)   : default=0 value=0
                           gpin (bool)   : default=0 value=0
                   roi_offset_x (int)    : min=0 max=2816 step=4 default=0
value=0
                   roi_offset_y (int)    : min=0 max=2044 step=4 default=0
value=0
                roi_auto_center (bool)   : default=1 value=1
               trigger_polarity (menu)   : min=0 max=1 default=0 value=1
            trigger_burst_count (int)    : min=1 max=1000 step=1 default=1
value=1
       trigger_debounce_time_us (int)    : min=0 max=1000000 step=1
default=0 value=0
           trigger_mask_time_us (int)    : min=0 max=1000000 step=1
default=0 value=0
  trigger_noise_supression_time (int)    : min=0 max=1000000 step=1
default=0 value=0
     auto_functions_roi_control (bool)   : default=1 value=1
        auto_functions_roi_left (int)    : min=0 max=3056 step=1 default=0
value=768
         auto_functions_roi_top (int)    : min=0 max=2032 step=1 default=0
value=512
       auto_functions_roi_width (int)    : min=16 max=3072 step=1 default=0
value=1536
      auto_functions_roi_height (int)    : min=16 max=2048 step=1 default=0
value=1024
              whitebalance_mode (menu)   : min=0 max=1 default=0 value=0
      white_balance_auto_preset (menu)   : min=0 max=4 default=0 value=0
  white_balance_green_component (int)    : min=0 max=255 step=1 default=64
value=64
whitebalance_temperature_preset (menu)   : min=0 max=8 default=6500 value=4
      white_balance_temperature (int)    : min=2500 max=10000 step=100
default=6500 value=4000
                flip_horizontal (bool)   : default=0 value=0
 exposure_auto_upper_limit_auto (bool)   : default=1 value=0
      exposure_auto_upper_limit (int)    : min=20 max=1000000 step=1
default=333 value=50000



So what is the problem here to get a smooth live stream? I tried to play a
bit with the framerates up and down but got no significant difference on the
lagging time. 



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