Jetson Nano - Gstreamer - Example Pipelines - Transforming
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Video Composition
The following pipeline shows 4 videotestsrc in a 2x2 grid
WIDTH=320 HEIGHT=240 CAPS="video/x-raw, width=$WIDTH, height=$HEIGHT" gst-launch-1.0 nvcompositor name=comp sink_0::xpos=0 sink_0::ypos=0 sink_0::width=$WIDTH sink_0::height=$HEIGHT sink_1::xpos=$WIDTH sink_1::ypos=0 sink_1::width=$WIDTH sink_1::height=$HEIGHT sink_2::xpos=0 sink_2::ypos=$HEIGHT sink_2::width=$WIDTH sink_2::height=$HEIGHT sink_3::xpos=$WIDTH sink_3::ypos=$HEIGHT sink_3::width=$WIDTH sink_3::height=$HEIGHT ! nvoverlaysink videotestsrc is-live=true ! $CAPS ! comp. videotestsrc is-live=true pattern=ball ! $CAPS ! comp. videotestsrc is-live=true pattern=ball ! $CAPS ! comp. videotestsrc is-live=true ! $CAPS ! comp.
Notice that sink_<n>::xpos and sink_<n>::ypos determine the position of the sink <n>. Also, you can change each stream size if required with sink_<n>::width and sink_<n>::height, on this example we are keeping the resolution unchanged.
Example of a 4x2 grid using one camera:
WIDTH=1280 HEIGHT=720 gst-launch-1.0 v4l2src device=/dev/video0 ! 'video/x-raw,width=$WIDTH,height=$HEIGHT,format=UYVY' ! \ nvvidconv ! 'video/x-raw(memory:NVMM), width=(int)$WIDTH, height=(int)$HEIGHT, framerate=(fraction)60/1' ! queue ! tee name=t \ t. ! queue ! comp. \ t. ! queue ! comp. \ t. ! queue ! comp. \ t. ! queue ! comp. \ t. ! queue ! comp. \ t. ! queue ! comp. \ t. ! queue ! comp. \ t. ! queue ! comp. \ nvcompositor name=comp \ sink_0::xpos=0 sink_0::ypos=0 sink_0::width=160 sink_0::height=120 \ sink_1::xpos=160 sink_1::ypos=0 sink_1::width=160 sink_1::height=120 \ sink_2::xpos=320 sink_2::ypos=0 sink_2::width=160 sink_2::height=120 \ sink_3::xpos=480 sink_3::ypos=0 sink_3::width=160 sink_3::height=120 \ sink_4::xpos=0 sink_4::ypos=120 sink_4::width=160 sink_4::height=120 \ sink_5::xpos=160 sink_5::ypos=120 sink_5::width=160 sink_5::height=120 \ sink_6::xpos=320 sink_6::ypos=120 sink_6::width=160 sink_6::height=120 \ sink_7::xpos=480 sink_7::ypos=120 sink_7::width=160 sink_7::height=120 ! nvoverlaysink
Video Conversion
Change Format
Following pipeline changes format from NV12 to RGBA:
gst-launch-1.0 nvarguscamerasrc ! 'video/x-raw(memory:NVMM), width=1920, height=1080, format=NV12, framerate=30/1' ! nvvidconv ! 'video/x-raw(memory:NVMM),format=RGBA' ! nvoverlaysink
Scale
Following pipeline scales down camera capture from 1080p to 720p
gst-launch-1.0 nvarguscamerasrc ! 'video/x-raw(memory:NVMM), width=1920, height=1080, format=NV12, framerate=30/1' ! nvvidconv ! 'video/x-raw(memory:NVMM),width=640,height=480' ! nvoverlaysink
Rotation
gst-launch-1.0 nvarguscamerasrc ! 'video/x-raw(memory:NVMM), width=640, height=480, format=NV12, framerate=30/1' ! nvvidconv flip-method=clockwise ! nvoverlaysink