Luckfox Pico Ultra W USB Camera

2025-03-21 6:49

Hi,

I am working on your RTSP demo(https://github.com/LuckfoxTECH/luckfox_ ... tsp_yolov5). But, I want to use USB camera for this demo. How can I do that? I have reviewed your main code and I think the part that needs to be changed is here:

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s32Ret = RK_MPI_VI_GetChnFrame(0, 0, &stViFrame, -1);

I think the id=0 part is for the CSI camera, but I couldn't find the description of this function. When I modified and compiled it, the code didn't work for the USB camera. Could you help me?

2025-03-21 7:47

Hello, the code you mentioned here s32Ret = RK_MPI_VI_GetChnFrame(0, 0, &stViFrame, -1); It is a function in the Rockchip micro multimedia processing interface used to obtain frame data from the CSI camera. Since USB cameras use standard UVC drivers, it is not possible to obtain data directly from this function. You'll need to adapt the code to the USB camera.
Solution: You can use either the V4L2 or OpenCV frameworks.

2025-03-27 5:53

Hi,

I entered the luckfox-config settings and switched to USB host mode. Then, I turned off the device, made the USB connection, and powered the device on. I followed the steps in this document: https://wiki.luckfox.com/Luckfox-Pico/L ... x-Pico-USB. After running the command v4l2-ctl --list-devices, I get the following output. I couldn’t solve the issue, what should I do?

2025-03-29 2:41

The error is normal, rkcif is the driver related to the CSI camera, your /dev/video0 has been recognized as USB 2.0 Camera: USB Camera, and it should be normal to see the input format supported by the camera

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v4l2-ctl --device=/dev/video0 --list-formats-ext

Or use the command to get the image

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v4l2-ctl --device=/dev/video0 --set-fmt-video=width=640,height=480,pixelformat=YUYV --stream-mmap --stream-to=video100.yuv --stream-count=30

2025-04-10 7:30

Hi,

I'm trying to stream video from a USB camera using FFmpeg on a Luckfox board. I can successfully capture frames from /dev/video0, but when I try to stream over RTSP, I get the following error:

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[root@luckfox root]# ffmpeg -f v4l2 -framerate 10 -video_size 640x480 -i /dev/vi
deo0 -f rtsp rtsp://0.0.0.0:8554/live.stream
ffmpeg version 4.4.4 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 8.3.0 (crosstool-NG 1.24.0)
  configuration: --enable-cross-compile --cross-prefix=/home/cro/GitPull/luckfox-pico/sysdrv/source/buildroot/buildroot-2023.02.6/output/host/bin/arm-rockchip830-linux-uclibcgnueabihf- --sysroot=/home/cro/GitPull/luckfox-pico/sysdrv/source/buildroot/buildroot-2023.02.6/output/host/arm-buildroot-linux-uclibcgnueabihf/sysroot --host-cc=/usr/bin/gcc --arch=arm --target-os=linux --disable-stripping --pkg-config=/home/cro/GitPull/luckfox-pico/sysdrv/source/buildroot/buildroot-2023.02.6/output/host/bin/pkg-config --disable-static --enable-shared --prefix=/usr --enable-avfilter --disable-version3 --enable-logging --enable-optimizations --disable-extra-warnings --enable-avdevice --enable-avcodec --enable-avformat --enable-network --disable-gray --enable-swscale-alpha --disable-small --enable-dct --enable-fft --enable-mdct --enable-rdft --disable-crystalhd --disable-dxva2 --enable-runtime-cpudetect --disable-hardcoded-tables --disable-mipsdsp --disable-mipsdspr2 --disable-msa --enable-hwaccels --disable-cuda --disable-cuvid --disable-nvenc --disable-avisynth --disable-frei0r --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libdc1394 --disable-libgsm --disable-libilbc --disable-libvo-amrwbenc --disable-symver --disable-doc --disable-gpl --disable-nonfree --enable-ffmpeg --enable-ffplay --enable-libv4l2 --enable-avresample --enable-ffprobe --disable-libxcb --disable-postproc --enable-swscale --enable-indevs --enable-alsa --enable-outdevs --enable-pthreads --enable-zlib --disable-bzlib --disable-libfdk-aac --disable-libcdio --enable-gnutls --disable-openssl --enable-libdrm --disable-libopenh264 --disable-vaapi --disable-vdpau --disable-mmal --disable-omx --disable-omx-rpi --disable-libopencv --disable-libopus --disable-libvpx --enable-libass --disable-libbluray --disable-libmfx --disable-librtmp --disable-libmp3lame --disable-libmodplug --disable-libspeex --disable-libtheora --enable-iconv --disable-libfreetype --disable-fontconfig --disable-libopenjpeg --disable-libx264 --disable-libx265 --disable-libdav1d --disable-x86asm --disable-mmx --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-avx --disable-avx2 --enable-armv6 --enable-vfp --enable-neon --disable-altivec --extra-libs=-latomic --enable-pic --cpu=cortex-a7
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
[video4linux2,v4l2 @ 0x4f6960] The driver changed the time per frame from 1/10 to 1/15
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 98.445228, bitrate: 73728 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 73728 kb/s, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
[tcp @ 0x5b5670] Connection to tcp://0.0.0.0:8554?timeout=0 failed: Connection refused
Could not write header for output file #0 (incorrect codec parameters ?): Connection refused
Error initializing output stream 0:0 -- 
Conversion failed!
[root@luckfox root]#

2025-04-11 12:32

Hi,

I am still working on USB camera RTSP streaming. I couldn’t find any solution with FFmpeg, so I tried GStreamer. I configured Buildroot, but I am facing some problems.

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[root@luckfox root]# gst-launch-1.0 --gst-version
GStreamer Core Library version 1.22.6
[root@luckfox root]# gst-launch-1.0 rtspsrc device=/dev/video0 ! fakesink
WARNING: erroneous pipeline: no element "rtspsrc"
[root@luckfox root]# gst-launch-1.0 gst-rtsp-server device=/dev/video0 ! fakesink
WARNING: erroneous pipeline: no element "gst-rtsp-server"
[root@luckfox root]# gst-launch-1.0 v4l2src device=/dev/video0 ! fakesink
WARNING: erroneous pipeline: no element "v4l2src"

I couldn't find a solution. Can you help me?

2025-04-12 2:34

GStreamer needs to rely on plugins to work, it looks like you should be missing related plugins, I have no experience with GStreamer, this problem belongs to GStreamer plugin configuration problems, you can consult relevant documentation or materials to solve