TX2 open camera with v4l2 ioctl

Autonomous Machines Jetson & Embedded Systems Jetson TX2
#1

Hi,
There are two questions:
1、I found a BUG,I turned on CSI Sensor in my app using ioctl.If I have used nvgstcapture or the gst-launch-1.0 plugin to turn the camera on and off.And then when I start my app, it blocks in the command forever:ioctl(this->fd, VIDIOC_DQBUF, &buf);
When I reboot the device,without using any gst-launch-1.0 commands or nvgstcapture before running my app, it works fine.
Is there any way to solve this problem?In addition to restarting the device.
2、My camera has a 1080 x 1280 resolution,But the BYTES PER LINE from the command (v4l2-ctl --all)is 2304.Although there is no impact when using nvgstcapture or gst-launch-1.0 plugin to display the image,
However, using ioctl to capture the frame image does not get the correct image,So I want to know how the BYTES PER LINE argument is computed and how it can be modified to be equal to 1080*2;
thank you.

#2

Hi,
This is expected. Please check information in
Jetson 'v4l2-ctrl' Raw Aquisition and bypass_mode = 0 : Framos

#3

Thank you for your reply,I got what’s your means,could you please tell me how to implement in app source code.
Questions2 don’t need care,I fixed it.thank you.

#4

Hi,
Please refer to this topic:
Failed to configure sensor_mode by using v4l2 API

1 Like
#5

I see,Thank you.

#6

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