• v4l2-ctl基本使用方法

    v4l2-ctl使用帮助可以参考：https://www.mankier.com/1/v4l2-ctl

    1 v4l2-ctl --list-devices

    列出所有设备

    1. USB 2.0 Camera: USB Camera (usb-0000:00:14.0-9):
    2.         /dev/video0
    3.         /dev/video1

    一个USB camera对应两个设备：一个是图像/视频采集，一个是metadata采集。

    2 v4l2-ctl --list-formats-ext --device path/to/video_device

    列出指定设备的预览支持格式
    v4l2-ctl --list-formats-ext --device /dev/video0

    1. ioctl: VIDIOC_ENUM_FMT
    2.         Type: Video Capture
    3.  
    4.         [0]: 'MJPG' (Motion-JPEG, compressed)
    5.                 Size: Discrete 2592x1944
    6.                         Interval: Discrete 0.033s (30.000 fps)
    7.                         Interval: Discrete 0.040s (25.000 fps)
    8.                         Interval: Discrete 0.050s (20.000 fps)
    9.                         Interval: Discrete 0.067s (15.000 fps)
    10.                         Interval: Discrete 0.100s (10.000 fps)
    11.                         Interval: Discrete 0.200s (5.000 fps)
    12.                         Interval: Discrete 0.033s (30.000 fps)
    13.                         Interval: Discrete 0.040s (25.000 fps)
    14.                         Interval: Discrete 0.050s (20.000 fps)
    15.                         Interval: Discrete 0.067s (15.000 fps)
    16.                         Interval: Discrete 0.100s (10.000 fps)
    17.                         Interval: Discrete 0.200s (5.000 fps)
    18.                 Size: Discrete 2560x1440
    19.                         Interval: Discrete 0.033s (30.000 fps)
    20.                         Interval: Discrete 0.050s (20.000 fps)
    21.                         Interval: Discrete 0.067s (15.000 fps)
    22.                         Interval: Discrete 0.100s (10.000 fps)
    23.                 Size: Discrete 2048x1536
    24.                         Interval: Discrete 0.033s (30.000 fps)
    25.                         Interval: Discrete 0.040s (25.000 fps)
    26.                         Interval: Discrete 0.050s (20.000 fps)
    27.                         Interval: Discrete 0.067s (15.000 fps)
    28.                         Interval: Discrete 0.100s (10.000 fps)
    29.                         Interval: Discrete 0.200s (5.000 fps)
    30.                 Size: Discrete 1920x1080
    31.                         Interval: Discrete 0.033s (30.000 fps)
    32.                         Interval: Discrete 0.040s (25.000 fps)
    33.                         Interval: Discrete 0.050s (20.000 fps)
    34.                         Interval: Discrete 0.067s (15.000 fps)
    35.                         Interval: Discrete 0.100s (10.000 fps)
    36.                         Interval: Discrete 0.200s (5.000 fps)
    37.                 Size: Discrete 1600x1200
    38.                         Interval: Discrete 0.033s (30.000 fps)
    39.                         Interval: Discrete 0.040s (25.000 fps)
    40.                         Interval: Discrete 0.050s (20.000 fps)
    41.                         Interval: Discrete 0.067s (15.000 fps)
    42.                         Interval: Discrete 0.100s (10.000 fps)
    43.                         Interval: Discrete 0.200s (5.000 fps)
    44.                 Size: Discrete 1280x960
    45.                         Interval: Discrete 0.033s (30.000 fps)
    46.                         Interval: Discrete 0.040s (25.000 fps)
    47.                         Interval: Discrete 0.050s (20.000 fps)
    48.                         Interval: Discrete 0.067s (15.000 fps)
    49.                         Interval: Discrete 0.100s (10.000 fps)
    50.                         Interval: Discrete 0.200s (5.000 fps)
    51.                 Size: Discrete 1280x720
    52.                         Interval: Discrete 0.033s (30.000 fps)
    53.                         Interval: Discrete 0.040s (25.000 fps)
    54.                         Interval: Discrete 0.050s (20.000 fps)
    55.                         Interval: Discrete 0.067s (15.000 fps)
    56.                         Interval: Discrete 0.100s (10.000 fps)
    57.                         Interval: Discrete 0.200s (5.000 fps)
    58.                 Size: Discrete 1024x768
    59.                         Interval: Discrete 0.033s (30.000 fps)
    60.                         Interval: Discrete 0.040s (25.000 fps)
    61.                         Interval: Discrete 0.050s (20.000 fps)
    62.                         Interval: Discrete 0.067s (15.000 fps)
    63.                         Interval: Discrete 0.100s (10.000 fps)
    64.                         Interval: Discrete 0.200s (5.000 fps)
    65.                 Size: Discrete 800x600
    66.                         Interval: Discrete 0.033s (30.000 fps)
    67.                         Interval: Discrete 0.040s (25.000 fps)
    68.                         Interval: Discrete 0.050s (20.000 fps)
    69.                         Interval: Discrete 0.067s (15.000 fps)
    70.                         Interval: Discrete 0.100s (10.000 fps)
    71.                         Interval: Discrete 0.200s (5.000 fps)
    72.                 Size: Discrete 640x480
    73.                         Interval: Discrete 0.033s (30.000 fps)
    74.                         Interval: Discrete 0.040s (25.000 fps)
    75.                         Interval: Discrete 0.050s (20.000 fps)
    76.                         Interval: Discrete 0.067s (15.000 fps)
    77.                         Interval: Discrete 0.100s (10.000 fps)
    78.                         Interval: Discrete 0.200s (5.000 fps)
    79.                 Size: Discrete 320x240
    80.                         Interval: Discrete 0.033s (30.000 fps)
    81.                         Interval: Discrete 0.040s (25.000 fps)
    82.                         Interval: Discrete 0.050s (20.000 fps)
    83.                         Interval: Discrete 0.067s (15.000 fps)
    84.                         Interval: Discrete 0.100s (10.000 fps)
    85.                         Interval: Discrete 0.200s (5.000 fps)
    86.                 Size: Discrete 2592x1944
    87.                         Interval: Discrete 0.033s (30.000 fps)
    88.                         Interval: Discrete 0.040s (25.000 fps)
    89.                         Interval: Discrete 0.050s (20.000 fps)
    90.                         Interval: Discrete 0.067s (15.000 fps)
    91.                         Interval: Discrete 0.100s (10.000 fps)
    92.                         Interval: Discrete 0.200s (5.000 fps)
    93.                         Interval: Discrete 0.033s (30.000 fps)
    94.                         Interval: Discrete 0.040s (25.000 fps)
    95.                         Interval: Discrete 0.050s (20.000 fps)
    96.                         Interval: Discrete 0.067s (15.000 fps)
    97.                         Interval: Discrete 0.100s (10.000 fps)
    98.                         Interval: Discrete 0.200s (5.000 fps)
    99.         [1]: 'YUYV' (YUYV 4:2:2)
    100.                 Size: Discrete 2592x1944
    101.                         Interval: Discrete 0.200s (5.000 fps)
    102.                         Interval: Discrete 0.200s (5.000 fps)
    103.                 Size: Discrete 2048x1536
    104.                         Interval: Discrete 0.200s (5.000 fps)
    105.                 Size: Discrete 1920x1080
    106.                         Interval: Discrete 0.200s (5.000 fps)
    107.                 Size: Discrete 1600x1200
    108.                         Interval: Discrete 0.200s (5.000 fps)
    109.                 Size: Discrete 1280x960
    110.                         Interval: Discrete 0.200s (5.000 fps)
    111.                 Size: Discrete 1280x720
    112.                         Interval: Discrete 0.100s (10.000 fps)
    113.                 Size: Discrete 1024x768
    114.                         Interval: Discrete 0.100s (10.000 fps)
    115.                 Size: Discrete 800x600
    116.                         Interval: Discrete 0.050s (20.000 fps)
    117.                 Size: Discrete 640x480
    118.                         Interval: Discrete 0.033s (30.000 fps)
    119.                         Interval: Discrete 0.040s (25.000 fps)
    120.                         Interval: Discrete 0.050s (20.000 fps)
    121.                         Interval: Discrete 0.067s (15.000 fps)
    122.                         Interval: Discrete 0.100s (10.000 fps)
    123.                         Interval: Discrete 0.200s (5.000 fps)
    124.                 Size: Discrete 320x240
    125.                         Interval: Discrete 0.033s (30.000 fps)
    126.                         Interval: Discrete 0.040s (25.000 fps)
    127.                         Interval: Discrete 0.050s (20.000 fps)
    128.                         Interval: Discrete 0.067s (15.000 fps)
    129.                         Interval: Discrete 0.100s (10.000 fps)
    130.                         Interval: Discrete 0.200s (5.000 fps)
    131.                 Size: Discrete 2592x1944
    132.                         Interval: Discrete 0.200s (5.000 fps)
    133.                         Interval: Discrete 0.200s (5.000 fps)

    v4l2-ctl --list-formats-ext --device /dev/video1

    1. ioctl: VIDIOC_ENUM_FMT
    2.         Type: Video Capture

    3 v4l2-ctl --all --device path/to/video_device

    获取指定设备的所有信息
    v4l2-ctl --all --device /dev/video0

    1. Driver Info:
    2.         Driver name      : uvcvideo
    3.         Card type        : USB 2.0 Camera: USB Camera
    4.         Bus info         : usb-0000:00:14.0-9
    5.         Driver version   : 5.11.22
    6.         Capabilities     : 0x84a00001
    7.                 Video Capture
    8.                 Metadata Capture
    9.                 Streaming
    10.                 Extended Pix Format
    11.                 Device Capabilities
    12.         Device Caps      : 0x04200001
    13.                 Video Capture
    14.                 Streaming
    15.                 Extended Pix Format
    16. Priority: 2
    17. Video input : 0 (Camera 1: ok)
    18. Format Video Capture:
    19.         Width/Height      : 1920/1080
    20.         Pixel Format      : 'MJPG' (Motion-JPEG)
    21.         Field             : None
    22.         Bytes per Line    : 0
    23.         Size Image        : 4147789
    24.         Colorspace        : Default
    25.         Transfer Function : Default (maps to Rec. 709)
    26.         YCbCr/HSV Encoding: Default (maps to ITU-R 601)
    27.         Quantization      : Default (maps to Full Range)
    28.         Flags             :
    29. Crop Capability Video Capture:
    30.         Bounds      : Left 0, Top 0, Width 1920, Height 1080
    31.         Default     : Left 0, Top 0, Width 1920, Height 1080
    32.         Pixel Aspect: 1/1
    33. Selection Video Capture: crop_default, Left 0, Top 0, Width 1920, Height 1080, Flags:
    34. Selection Video Capture: crop_bounds, Left 0, Top 0, Width 1920, Height 1080, Flags:
    35. Streaming Parameters Video Capture:
    36.         Capabilities     : timeperframe
    37.         Frames per second: 30.000 (30/1)
    38.         Read buffers     : 0
    39.                      brightness 0x00980900 (int)    : min=-64 max=64 step=1 default=0 value=0
    40.                        contrast 0x00980901 (int)    : min=0 max=64 step=1 default=32 value=32
    41.                      saturation 0x00980902 (int)    : min=0 max=128 step=1 default=70 value=70
    42.                             hue 0x00980903 (int)    : min=-40 max=40 step=1 default=0 value=0
    43. white_balance_temperature_auto 0x0098090c (bool)   : default=1 value=1
    44.                           gamma 0x00980910 (int)    : min=72 max=500 step=1 default=100 value=100
    45.                            gain 0x00980913 (int)    : min=0 max=100 step=1 default=0 value=0
    46.            power_line_frequency 0x00980918 (menu)   : min=0 max=2 default=1 value=1
    47.                                 0: Disabled
    48.                                 1: 50 Hz
    49.                                 2: 60 Hz
    50.       white_balance_temperature 0x0098091a (int)    : min=2800 max=6500 step=1 default=4600 value=4600 flags=inactive
    51.                       sharpness 0x0098091b (int)    : min=0 max=6 step=1 default=3 value=3
    52.          backlight_compensation 0x0098091c (int)    : min=0 max=2 step=1 default=1 value=1
    53.                   exposure_auto 0x009a0901 (menu)   : min=0 max=3 default=3 value=3
    54.                                 1: Manual Mode
    55.                                 3: Aperture Priority Mode
    56.               exposure_absolute 0x009a0902 (int)    : min=1 max=5000 step=1 default=157 value=157 flags=inactive

    v4l2-ctl --all --device /dev/video1

    1. Driver Info:
    2.         Driver name      : uvcvideo
    3.         Card type        : USB 2.0 Camera: USB Camera
    4.         Bus info         : usb-0000:00:14.0-9
    5.         Driver version   : 5.11.22
    6.         Capabilities     : 0x84a00001
    7.                 Video Capture
    8.                 Metadata Capture
    9.                 Streaming
    10.                 Extended Pix Format
    11.                 Device Capabilities
    12.         Device Caps      : 0x04a00000
    13.                 Metadata Capture
    14.                 Streaming
    15.                 Extended Pix Format
    16. Priority: 2
    17. Format Metadata Capture:
    18.         Sample Format   : 'UVCH' (UVC Payload Header Metadata)
    19.         Buffer Size     : 1024

    4 v4l2-ctl --device path/to/video_device --set-fmt-video=width=width,height=height,pixelformat=MJPG --stream-mmap --stream-to=path/to/output.jpg --stream-count=1

    从特定设备以特定分辨率抓图
    v4l2-ctl --device /dev/video0 --set-fmt-video=width=1920,height=1080,pixelformat=MJPG --stream-mmap --stream-to=./output_1920.jpg --stream-count=1
    v4l2-ctl --device /dev/video0 --set-fmt-video=width=2560,height=1440,pixelformat=MJPG --stream-mmap --stream-to=./output_2560.jpg --stream-count=1
    v4l2-ctl --device /dev/video0 --set-fmt-video=width=2592,height=1944,pixelformat=MJPG --stream-mmap --stream-to=./output_2592.jpg --stream-count=1
    FastStoneImageViewer对比看图，1920x1080先scale到2560*1080。
    v4l2-ctl --device /dev/video0 --set-fmt-video=width=1920,height=1080,pixelformat=YUYV --stream-mmap --stream-to=./output_1920.yuyv --stream-count=1
    ...

    5 v4l2-ctl --device path/to/video_device --set-fmt-video=width=width,height=height,pixelformat=format --stream-mmap --stream-to=path/to/output --stream-count=number_of_frames_to_capture

    从特定设备以特定分辨率抓流
    v4l2-ctl --device /dev/video0 --set-fmt-video=width=1920,height=1080,pixelformat=MJPG --stream-mmap --stream-to=./output --stream-count=100
    支持264的可以编码为h264看
    v4l2-ctl --device /dev/video0 --set-fmt-video=width=1920,height=1080,pixelformat=H264 --stream-mmap --stream-to=./output --stream-count=100
    v4l2-ctl --device /dev/video0 --set-fmt-video=width=1920,height=1080,pixelformat=MJPG --stream-mmap --stream-to=./output.mjpg --stream-count=300
    找到了可以播放mjpg格式的软件：完美解码的PotPlayer

    注意：output.mjpg是输出的文件，默认用PotPlayer软件打开
    v4l2-ctl --device /dev/video0 --set-fmt-video=width=2560,height=1440,pixelformat=MJPG --stream-mmap --stream-to=./output_2560.mjpg --stream-count=30
    v4l2-ctl --device /dev/video0 --set-fmt-video=width=2592,height=1944,pixelformat=MJPG --stream-mmap --stream-to=./output_2592.mjpg --stream-count=300

    6 v4l2-ctl --list-ctrls --device /path/to/video_device

    列出设备控制值
    v4l2-ctl --list-ctrls --device /dev/video0

    1.                      brightness 0x00980900 (int)    : min=-64 max=64 step=1 default=0 value=0
    2.                        contrast 0x00980901 (int)    : min=0 max=64 step=1 default=32 value=32
    3.                      saturation 0x00980902 (int)    : min=0 max=128 step=1 default=70 value=70
    4.                             hue 0x00980903 (int)    : min=-40 max=40 step=1 default=0 value=0
    5. white_balance_temperature_auto 0x0098090c (bool)   : default=1 value=1
    6.                           gamma 0x00980910 (int)    : min=72 max=500 step=1 default=100 value=100
    7.                            gain 0x00980913 (int)    : min=0 max=100 step=1 default=0 value=0
    8.            power_line_frequency 0x00980918 (menu)   : min=0 max=2 default=1 value=1
    9.       white_balance_temperature 0x0098091a (int)    : min=2800 max=6500 step=1 default=4600 value=4600 flags=inactive
    10.                       sharpness 0x0098091b (int)    : min=0 max=6 step=1 default=3 value=3
    11.          backlight_compensation 0x0098091c (int)    : min=0 max=2 step=1 default=1 value=1
    12.                   exposure_auto 0x009a0901 (menu)   : min=0 max=3 default=3 value=3
    13.               exposure_absolute 0x009a0902 (int)    : min=1 max=5000 step=1 default=157 value=157 flags=inactive

    7 v4l2-ctl --stream-mmap --stream-to-host

    Stream video from /dev/video0 and stream it over the network

    8 v4l2-ctl --stream-dmabuf --export-device /dev/video2

    Stream video from /dev/video0 using DMABUFs exported from /dev/video2

    9 v4l2-ctl --stream-mmap --stream-out-mmap

    Stream video from a memory-to-memory device

    10 v4l2-ctl -d1 --stream-mmap --out-device /dev/video2 --stream-out-dmabuf

    Stream video from a capture video device (/dev/video1) to an output video device (/dev/video2)

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  • 原文地址：https://blog.csdn.net/u012906122/article/details/126356698