Question

我尝试直接从Logitech c920摄像机获取h264流，这是可行的。但我想设置裁剪方式以减少一些无用的方面，从而使论点无效。

v4l2-ctl --set-crop=top=16,left=16,width=80,height=80
VIDIOC_G_CROP: failed: Invalid argument


root@raspberrypi:/home/pi# v4l2-ctl --all
Driver Info (not using libv4l2):
    Driver name   : uvcvideo
    Card type     : HD Pro Webcam C920
    Bus info      : usb-3f980000.usb-1.5
    Driver version: 4.19.29
    Capabilities  : 0x84A00001
        Video Capture
        Streaming
        Extended Pix Format
        Device Capabilities
    Device Caps   : 0x04200001
        Video Capture
        Streaming
        Extended Pix Format
Priority: 2
Video input : 0 (Camera 1: ok)
Format Video Capture:
    Width/Height      : 640/480
    Pixel Format      : 'YUYV'
    Field             : None
    Bytes per Line    : 1280
    Size Image        : 614400
    Colorspace        : sRGB
    Transfer Function : Default
    YCbCr/HSV Encoding: Default
    Quantization      : Default
    Flags             : 
Crop Capability Video Capture:
    Bounds      : Left 0, Top 0, Width 640, Height 480
    Default     : Left 0, Top 0, Width 640, Height 480
    Pixel Aspect: 1/1
Selection: crop_default, Left 0, Top 0, Width 640, Height 480
Selection: crop_bounds, Left 0, Top 0, Width 640, Height 480
Streaming Parameters Video Capture:
    Capabilities     : timeperframe
    Frames per second: 30.000 (30/1)
    Read buffers     : 0

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具有H264编码的Logitech C920网络摄像头，无法设置裁剪

0 个答案: