GStreamer Pan Tilt Zoom and Rotate Element - PC Pipelines

GStreamer PTZR
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Examples
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This page provides example GStreamer pipelines to test GstPTZR features on a PC. These pipelines where tested in Ubuntu 16.04.

Problems running the pipelines shown on this page? Please see our GStreamer Debugging guide for help.

• Note: before you start to test the examples, verify you have a display available in your system by executing the given command directly on the HW (no remote connection):

echo $DISPLAY

GStreamer pipelines

Same input and output resolution with zoom level 1:

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

You can change the zoom level by changing "zoom-level".

Magnification (zoom level > 1):

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr zoom-level=2 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

Reduction (zoom level < 1)

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr zoom-level=0 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

You can perform translations relative to the center of the input image by setting the "pan-level" and "tilt-level" properties or perform translations relative to the current position with "pan-delta" and "tilt-delta".

Translate right (-1 < pan level < 0):

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr pan-level=-1 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

Translate left (0 < pan level < 1):

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr pan-level=1 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

Translate down (-1 < tilt level < 0):

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr tilt-level=-1 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

Translate up (0 < tilt level < 1):

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr tilt-level=100 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

The property "normalize-translation" (true by default) lets you switch the translation normalization ON and OFF. When translation normalization is true the minimum and maximum translation values are mapped to -1 and 1. On the other hand, when it is set to false, the pan and tilt levels reflect pixels on the input image.

Turn off translation normalization:

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr normalize-translation=false ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

The property "output-reference" (true by default) lets you change the coordinate system used as reference for translations. This is specially useful after performing a rotation. If you want to move over the input image axis, it must be changed to false.

Set input coordinate system as reference for translations:

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr output-reference=false ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

To rotate the input modify the "rotate-level" property (degrees). You can also perform rotation relative to the current angle with "rotate-delta":

Rotate counter-clockwise (rotate level < 0):

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr rotate-level=-100 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

Rotate clockwise (rotate level > 0):

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr rotate-level=100 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

The element supports input and output of any resolution and aspect ratio

Smaller input image, different aspect ratio:

IN_CAPS='video/x-raw,format=RGBA,width=1024,height=768,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr zoom-level=1 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

Bigger input image, different aspect ratio:

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1280,height=1024,framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr zoom-level=1 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

You can use ranges for input and output caps or leave them unspecified

Resolution range:

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=[480,1280],height=[680,1024],framerate=30/1'
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr zoom-level=1 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink

Unspecified caps:

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
gst-launch-1.0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr zoom-level=1 ! videoconvert ! xvimagesink

Gstd pipelines

Run the element with gstd to change parameters dynamically:

IN_CAPS='video/x-raw,format=RGBA,width=1920,height=1080,framerate=30/1' 
OUT_CAPS='video/x-raw,format=RGBA,width=1600,height=900,framerate=30/1'
gstd&
gstd-client pipeline_create p0 videotestsrc pattern=circular is-live=true num-buffers=-1 ! capsfilter caps="$IN_CAPS" ! ptzr name=ptzr0 ! capsfilter caps="$OUT_CAPS" ! videoconvert ! xvimagesink
gstd-client pipeline_play p0

Change propierties:

gstd-client element_set p0 "ptzr0 zoom-level 0.0" 
gstd-client element_set p0 "ptzr0 zoom-level 2.0" 
gstd-client element_set p0 "ptzr0 zoom-level 1.0" 
gstd-client element_set p0 "ptzr0 tilt-level -1.0" 
gstd-client element_set p0 "ptzr0 tilt-level 1.0" 
gstd-client element_set p0 "ptzr0 tilt-level 0.0" 
gstd-client element_set p0 "ptzr0 pan-level -1.0" 
gstd-client element_set p0 "ptzr0 pan-level 1.0" 
gstd-client element_set p0 "ptzr0 pan-level 0.0" 
gstd-client element_set p0 "ptzr0 tilt-delta -1.0" 
gstd-client element_set p0 "ptzr0 tilt-delta 1.0" 
gstd-client element_set p0 "ptzr0 tilt-delta 0.0" 
gstd-client element_set p0 "ptzr0 pan-delta -1.0" 
gstd-client element_set p0 "ptzr0 pan-delta 1.0" 
gstd-client element_set p0 "ptzr0 pan-delta 0.0" 
gstd-client element_set p0 "ptzr0 rotate-level -90.0" 
gstd-client element_set p0 "ptzr0 rotate-level 90.0" 
gstd-client element_set p0 "ptzr0 rotate-level 0.0" 
gstd-client element_set p0 "ptzr0 rotate-delta -90.0" 
gstd-client element_set p0 "ptzr0 rotate-delta 90.0" 
gstd-client element_set p0 "ptzr0 rotate-delta 0.0" 
gstd-client element_set p0 "ptzr0 normalize-translation false" 
gstd-client element_set p0 "ptzr0 normalize-translation true" 
gstd-client element_set p0 "ptzr0 output-reference false" 
gstd-client element_set p0 "ptzr0 output-reference true"

Stop the pipeline:

gstd-client pipeline_stop p0
gstd-client pipeline_delete p0