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v4l2-ctl命令使用

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  • 获取设备支持的格式(–list-formats-ext)

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    novauto@novauto:~/raw12/yuv422$ v4l2-ctl --list-formats-ext
    ioctl: VIDIOC_ENUM_FMT
    	Index       : 0
    	Type        : Video Capture
    	Pixel Format: 'UYVY'
    	Name        : UYVY 4:2:2
    		Size: Discrete 1920x1080
    			Interval: Discrete 0.033s (30.000 fps)

    	Index       : 1
    	Type        : Video Capture
    	Pixel Format: 'NV16'
    	Name        : Y/CbCr 4:2:2
    		Size: Discrete 1920x1080
    			Interval: Discrete 0.033s (30.000 fps)

    	Index       : 2
    	Type        : Video Capture
    	Pixel Format: 'UYVY'
    	Name        : UYVY 4:2:2
    		Size: Discrete 1920x1080
    			Interval: Discrete 0.033s (30.000 fps)

  • 获取当前视频格式（–get-fmt-video）

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    v4l2-ctl --get-fmt-video

  • 采图命令

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    novauto@novauto:~/raw12/yuv422$ v4l2-ctl -d /dev/video2 --set-fmt-video=width=1920,height=1080,pixelformat=UYVY --stream-count=1 --stream-mmap --stream-to=csi.yuv --verbose
    VIDIOC_QUERYCAP: ok
    VIDIOC_G_FMT: ok
    VIDIOC_S_FMT: ok
    Format Video Capture:
    	Width/Height      : 1920/1080
    	Pixel Format      : 'UYVY'
    	Field             : None
    	Bytes per Line    : 3840
    	Size Image        : 4147200
    	Colorspace        : sRGB
    	Transfer Function : Default (maps to sRGB)
    	YCbCr/HSV Encoding: Default (maps to ITU-R 601)
    	Quantization      : Default (maps to Limited Range)
    	Flags             : 
    VIDIOC_REQBUFS: ok
    VIDIOC_QUERYBUF: ok
    VIDIOC_QBUF: ok
    VIDIOC_QUERYBUF: ok
    VIDIOC_QBUF: ok
    VIDIOC_QUERYBUF: ok
    VIDIOC_QBUF: ok
    VIDIOC_QUERYBUF: ok
    VIDIOC_QBUF: ok
    VIDIOC_STREAMON: ok
    	Index    : 0
    	Type     : Video Capture
    	Flags    : mapped
    	Field    : None
    	Sequence : 0
    	Length   : 4147200
    	Bytesused: 4147200
    	Timestamp: 1626894853.303928s (Monotonic, End-of-Frame)

    VIDIOC_STREAMOFF: ok

  • 如果抓不到数据会返回错误 (–stream-poll的参数)

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    v4l2-ctl -d /dev/video0 --set-fmt-video=width=1920,height=1080,pixelformat='NV12' --stream-mmap=3 --stream-skip=4 --stream-to=/data/1920x1080_nv12.yuv --stream-count=5 --stream-poll

常用命令链接：https://blog.csdn.net/qq_34341546/article/details/129015346