OpenCV VideoCapture.get()参数详解

param	define
cv2.VideoCapture.get(0)	视频文件的当前位置（播放）以毫秒为单位
cv2.VideoCapture.get(1)	基于以0开始的被捕获或解码的帧索引
cv2.VideoCapture.get(2)	视频文件的相对位置（播放）：0=电影开始，1=影片的结尾。
cv2.VideoCapture.get(3)	在视频流的帧的宽度
cv2.VideoCapture.get(4)	在视频流的帧的高度
cv2.VideoCapture.get(5)	帧速率
cv2.VideoCapture.get(6)	编解码的4字-字符代码
cv2.VideoCapture.get(7)	视频文件中的帧数
cv2.VideoCapture.get(8)	返回对象的格式
cv2.VideoCapture.get(9)	返回后端特定的值，该值指示当前捕获模式
cv2.VideoCapture.get(10)	图像的亮度(仅适用于照相机)
cv2.VideoCapture.get(11)	图像的对比度(仅适用于照相机)
cv2.VideoCapture.get(12)	图像的饱和度(仅适用于照相机)
cv2.VideoCapture.get(13)	色调图像(仅适用于照相机)
cv2.VideoCapture.get(14)	图像增益(仅适用于照相机)（Gain在摄影中表示白平衡提升）
cv2.VideoCapture.get(15)	曝光(仅适用于照相机)
cv2.VideoCapture.get(16)	指示是否应将图像转换为RGB布尔标志
cv2.VideoCapture.get(17)	× 暂时不支持
cv2.VideoCapture.get(18)	立体摄像机的矫正标注（目前只有DC1394 v.2.x后端支持这个功能）

具体属性名及英文说明按顺序如下：
CV_CAP_PROP_POS_MSEC Current position of the video file in milliseconds or video capture timestamp.
CV_CAP_PROP_POS_FRAMES 0-based index of the frame to be decoded/captured next.
CV_CAP_PROP_POS_AVI_RATIO Relative position of the video file: 0 - start of the film, 1 - end of the film.
CV_CAP_PROP_FRAME_WIDTH Width of the frames in the video stream.
CV_CAP_PROP_FRAME_HEIGHT Height of the frames in the video stream.
CV_CAP_PROP_FPS Frame rate.
CV_CAP_PROP_FOURCC 4-character code of codec.
CV_CAP_PROP_FRAME_COUNT Number of frames in the video file.
CV_CAP_PROP_FORMAT Format of the Mat objects returned by retrieve() .
CV_CAP_PROP_MODE Backend-specific value indicating the current capture mode.
CV_CAP_PROP_BRIGHTNESS Brightness of the image (only for cameras).
CV_CAP_PROP_CONTRAST Contrast of the image (only for cameras).
CV_CAP_PROP_SATURATION Saturation of the image (only for cameras).
CV_CAP_PROP_HUE Hue of the image (only for cameras).
CV_CAP_PROP_GAIN Gain of the image (only for cameras).
CV_CAP_PROP_EXPOSURE Exposure (only for cameras).
CV_CAP_PROP_CONVERT_RGB Boolean flags indicating whether images should be converted to RGB.
CV_CAP_PROP_WHITE_BALANCE Currently not supported
CV_CAP_PROP_RECTIFICATION Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently)
Note: 如果查询的视频属性是VideoCapture类不支持的，将会返回0