2023年7月17日 · Hello, I am trying to implement a frame_counter to make sure that I know about dropped frames. I am using v4l2 userptr to receive frames and I would like to implement the frame_counter as early as possible in the imaging pipeline. I was hoping on v4l2_buf->sequence variable since this is a frame_counter implemented in v4l2 already. But I noticed that it just counts the buffers I queue and ...

2020年8月20日 · We want to get v4l2_buffer timestamp with system os. We use this follow method to update our code. But we found there are not match. How can we get v4l2 buffer timestamp with correct system os timestamp? (eptime us)1597886732.814339 (system os time)1597886725.256784 We still use JetPack3.3. Is there any way to get system os timestamp directly with v4l2 buffer?

2024年11月19日 · Hi, I have developed a driver for a camera that supports 3 modes, GREY, Y14, and Y16. The camera outputs in 1680x1050 @ 90,45, or 30. The issue is when I have use_sensor_mode_id = false and I use a command like v4l2-ctl -d /dev/video1 --set-fmt-video=width=1680,height=1050,pixelformat='Y14 ' --stream-mmap --stream-to=frame.bin it is unable to select the correct Y14 mode, it always selects mode ...

2020年8月27日 · here is : v4l2-ctl -l. Camera Controls. group_hold 0x009a2003 (bool) : default=0 value=0 flags=execute-on-write sensor_mode 0x009a2008 (int64) : min=0 max=5 step=1 default=0 value=0 flags=slider gain 0x009a2009 (int64) : min=16 max=170 step=1 default=16 value=130 flags=slider exposure 0x009a200a (int64) : min=13 max=683709 step=1 default=2495 value=333333 flags=slider frame_rate 0x009a200b ...

2023年10月10日 · Hello, my goal is to A. use logitech 4k usb camera. B. capture 4k frames (to get 4k uncomressed representation in memory) C. save raw data to disk ( 4k, bmp, uncompressed) my work plan is : A. Done: set v4l2 to capture 4k (40962160,MJPG). B. Done: write & execute c++ app that uses v4l2 c. TODO: validate i have in-memory raw representation of the image (40962160 bytes) C. TODO: save raw data ...

2021年9月10日 · I’ve read reports that say that capturing video from a CSI-connected camera will only provide bayer data, and that only using libargus enables the ISP. I’d prefer to use v4l2, mostly because it has a C (vs C++) interface, which is easier to access via FFI. And, it does seem that when I use libv4l2, I get lots of libargus output. Before I …

2019年1月17日 · V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN 0x00000000 Unknown timestamp type. This type is used by drivers before Linux 3.9 and may be either monotonic (see below) or realtime (wall clock). Monotonic clock has been favoured in embedded systems whereas most of the drivers use the realtime clock.

2024年8月14日 · 我在probe函数里面加了一些打印，发现能够正确识别设备树的devnode值是video0，但是我再进一步打印num_channels和port@0，却发现我设置的num_channels是8，但读取的是2，并且port@0也无法读取，我不知道是我打印的有问题，还是说设备树设置哪里不对，下面是dmesg日志，以及设备树和我加打印的部分源码

2024年7月16日 · Environment • Hardware Platform (Jetson / GPU) Jetson Orin NX • DeepStream Version DeepStream 6.1 • JetPack Version (valid for Jetson only) Host: 5.1.1-b56 Docker: 5.0.2-b231 • TensorRT Version Host: 8.4.1.5 Docker: 8.5.2.2 • Issue Type( questions, new requirements, bugs) Question I have been testing with two different usb cameras and I find that MJPG framerate is lower than what ...

2022年8月8日 · Continuing the discussion from Meaning of VI and NVCSI in DT of TX2:. the V4L2 Sensor Driver Development Tutorial is useful for beginners, there are many links in the slides but I can’t download them without the access to the slides.