如何找出网络摄像头的最大帧率？

Question

如何从网络摄像头获得最大帧速率？

Answer 1

在 Linux 中，假设您的网络摄像头可以通过 Video4Linux 访问，请使用以下命令：

$ v4l2-ctl --list-formats-ext

（如果您有多个视频设备，请添加-d <device>选项，其中<device是设备文件的路径，例如/dev/video1.

示例输出：

ioctl: VIDIOC_ENUM_FMT
    Index       : 0
    Type        : Video Capture
    Pixel Format: 'YUYV'
    Name        : YUV 4:2:2 (YUYV)
        Size: Discrete 640x480
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 160x120
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 176x144
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 320x240
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 352x288
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 1280x720
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 1920x1080
            Interval: Discrete 0.200s (5.000 fps)

    Index       : 1
    Type        : Video Capture
    Pixel Format: 'MJPG' (compressed)
    Name        : MJPEG
        Size: Discrete 640x480
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 160x120
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 176x144
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 320x240
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 352x288
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 1280x720
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)
        Size: Discrete 1920x1080
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.067s (15.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
            Interval: Discrete 0.133s (7.500 fps)

（请注意，这些是网络摄像头和驱动程序宣传的值。许多因素可能会影响实际性能。）

在 Windows / 其他操作系统中，请扩展此答案。

Answer 2

嗯...首先...

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QuickCapture 软件应用程序视频录制默认为 15 FPS。选择此设置是因为 Logitech 认为参考其 RightLight\xe2\x84\xa2/RightLight\xe2\x84\xa22 技术，它可以提供最佳的整体图像质量。

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和..

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为了以 30 FPS 捕获视频，需要第三方视频录制软件。

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现在，他们继续说明哪些设置是必要的，如何调整“快门速度”（尽管没有实际的快门），如何使用低光增强可能会严重地将帧速率降至 5 fps，等等。但是，重要的信息......好吧......自己阅读......

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QuickCam\xc2\xae Pro 9000 可以在 640x480 分辨率下物理输出 30 FPS，在 800x600 分辨率下输出 30 FPS，在 960x720 分辨率 (MJPG) 下输出 15 FPS。

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对于大多数应用程序，除非您的相机被检测为增强型 USB 2.0 设备 (480 Mbps)，否则您的速度将限制在大约 10 FPS（USB 带宽限制为 12 Mbps）。

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160x120 x 24 位颜色 x 30 FPS x（格式）= 9,216,000 bps(9.216 Mbps)

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320x240 x 24 位颜色 x 9.766 FPS x（格式）= 12,000,000 bps(12.000 Mbps)

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640x480 x 24 位颜色 x 2.441 FPS x（格式）= 12,000,000 bps(12.000 Mbps)

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320x240 x 24 位颜色 x 30 FPS x（格式）= 36,864,000 bps(36.864 Mbps)

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640x480 x 24 位颜色 x 30 FPS x（格式）= 147,456,000 bps(147.456 Mbps)

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800x600 x 24 位颜色 x 30 FPS x（格式）= 230,400,000 bps(230.400 Mbps)

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960x720 x 24 位颜色 x 30 FPS x（格式）= 331,776,000 bps(331.776 Mbps)

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1280x960 x 24 位颜色 x 24.414 FPS x（格式）= 480,000,000 bps(480.000 Mbps)

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简而言之，这取决于您用于从相机获取视频的软件、USB 连接的类型、从相机获取的图像的大小以及软件内的捕获设置。

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所以...如果没有您提供更具体的信息，就无法向您提供更具体的信息。

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读起来。 http://forums.logitech.com/t5/Webcams/How-to-get-30-Frames-Per-Second-with-your-Logitech-Webcam/td-p/202898

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