OpenCV: Vedio I/O

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本文参考了：
OpenCV 3.1.0 Medio I/O官方文档

propid接口

propId: Property identifier

virtual double cv::VideoCapture::get(int propId)    const
virtual bool cv::VideoCapture::set(int propId, double value)

enum  { 
  cv::CAP_PROP_POS_MSEC =0, 
  cv::CAP_PROP_POS_FRAMES =1, 
  cv::CAP_PROP_POS_AVI_RATIO =2, 
  cv::CAP_PROP_FRAME_WIDTH =3, 
  cv::CAP_PROP_FRAME_HEIGHT =4, 
  cv::CAP_PROP_FPS =5, 
  cv::CAP_PROP_FOURCC =6, 
  cv::CAP_PROP_FRAME_COUNT =7, 
  cv::CAP_PROP_FORMAT =8, 
  cv::CAP_PROP_MODE =9, 
  cv::CAP_PROP_BRIGHTNESS =10, 
  cv::CAP_PROP_CONTRAST =11, 
  cv::CAP_PROP_SATURATION =12, 
  cv::CAP_PROP_HUE =13, 
  cv::CAP_PROP_GAIN =14, 
  cv::CAP_PROP_EXPOSURE =15, 
  cv::CAP_PROP_CONVERT_RGB =16, 
  cv::CAP_PROP_WHITE_BALANCE_BLUE_U =17, 
  cv::CAP_PROP_RECTIFICATION =18,
  ...
}

• 参数说明

CAP_PROP_POS_MSEC Current position of the video file in milliseconds or video capture timestamp.
CAP_PROP_POS_FRAMES 0-based index of the frame to be decoded/captured next.
CAP_PROP_POS_AVI_RATIO Relative position of the video file: 0 - start of the film, 1 - end of the film.
CAP_PROP_FRAME_WIDTH Width of the frames in the video stream.
CAP_PROP_FRAME_HEIGHT Height of the frames in the video stream.
CAP_PROP_FPS Frame rate.
CAP_PROP_FOURCC 4-character code of codec.
CAP_PROP_FRAME_COUNT Number of frames in the video file.
CAP_PROP_FORMAT Format of the Mat objects returned by retrieve() .
CAP_PROP_MODE Backend-specific value indicating the current capture mode.
CAP_PROP_BRIGHTNESS Brightness of the image (only for cameras).
CAP_PROP_CONTRAST Contrast of the image (only for cameras).
CAP_PROP_SATURATION Saturation of the image (only for cameras).
CAP_PROP_HUE Hue of the image (only for cameras).
CAP_PROP_GAIN Gain of the image (only for cameras).
CAP_PROP_EXPOSURE Exposure (only for cameras).
CAP_PROP_CONVERT_RGB Boolean flags indicating whether images should be converted to RGB.
CAP_PROP_WHITE_BALANCE Currently not supported
CAP_PROP_RECTIFICATION Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently)