Issue with RTSP streaming and decoding to v4l2loopback

Autonomous Machines Jetson & Embedded Systems Jetson AGX Orin
2

It may be related to your v4l2loopback version.

It works in my case using 0.12.3 built with dkms such as Gstreamer v4l2loopback hw mjpeg stream - #5 by Honey_Patouceul. (this post was building 0.12.5).

I made RTSP server with test-launch:

./test-launch "videotestsrc ! nvvidconv ! nvv4l2h265enc insert-sps-pps=1 insert-vui=1 idrinterval=15 ! h265parse ! rtph265pay name=pay0"

Then installed v4l2loopback. Note that if you change format, framerate or else you may have to unload the module with rmmod and reinstall.
Then launched a pipeline connecting to RTSP server, decoding and sending to v4l2sink. Note that you would use identity with drop-allocation property set:

sudo rmmod v4l2loopback
sudo modprobe v4l2loopback

#My AGX had no camera, so the virtual node is video0
gst-launch-1.0 rtspsrc latency=0 location=rtsp://127.0.0.1:8554/test ! rtph265depay ! queue ! h265parse ! nvv4l2decoder ! nvvidconv ! videoconvert ! identity drop-allocation=1 ! v4l2sink device=/dev/video0

v4l2-ctl -d0 --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
	Type: Video Capture

	[0]: 'YUYV' (YUYV 4:2:2)
		Size: Discrete 320x240
			Interval: Discrete 0.033s (30.000 fps)

and using the virtual video node works, although a bit slow:

gst-launch-1.0 v4l2src device=/dev/video0 ! videoconvert ! autovideosink

The messages failed to open /dev/video4: No such file or directory… are because you gave number 41 to your virtual node, but there are many available nodes with lower number. Probably using /dev/video4 for v4l2loopback would fix this.

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