GStreamer Pan Tilt Zoom and Rotate Element - PC Pipelines

GStreamer PTZR
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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.

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