Programtic access to raw video via v4l2

Autonomous Machines Jetson & Embedded Systems Jetson TX2
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1

I am using an Lattice Crosslink FPGA to simulate an imx219 camera based on this project:

I am using a TX2 NX with JetPack 4.6.4 and due to the way that crosslink generates CRC I had to disable CRC in csi4 based on this link:

Now I can capture raw frames (sensor is RAW10) using v4l2-ctl like this:
v4l2-ctl --set-fmt-video=width=3264,height=2464,pixelformat=RG10 --stream-mmap --stream-count=100 -d /dev/video0 --stream-to=file.raw

I can’t use argus since argus doesn’t support disabling CRC:

How can I programmatically read frames that emulate the v4l2-ctl command.

Any way with gstreamer? I tried this line but it failed since it says it can open a raw stream:


nvidia@tegra-ubuntu:~$ gst-launch-1.0 v4l2src device=/dev/video0 ! 'video/x-raw(memory:NVMM), width=3280, height=2464, format=(string)NV12, framerate=(fraction)20/1' ! omxh264enc control-rate=2 bitrate=4000000 ! 'video/x-h264, stream-format=(string)byte-stream' ! h264parse ! rtph264pay mtu=1400 ! udpsink host=10.42.0.1 port=5000 sync=false async=false
WARNING: erroneous pipeline: could not link v4l2src0 to omxh264enc-omxh264enc0, v4l2src0 can't handle caps video/x-raw(memory:NVMM), width=(int)3280, height=(int)2464, format=(string)NV12, framerate=(fraction)20/1

How you typically access raw data via v4l?

3

Try have FPGA output YUV422.

Thanks

4

Ofc that is the easy way but not sure I can easily change that, also would need to change the driver…

Any other way?

5

You can also modify the v4l2src to support it.

6

Any pointers on how to do it?

7

Have reference to below link.

8

Thank you!

10

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