原因分析：
VideoCapture.get()返回的帧率以及宽高等均为double类型，以int类型接收或者打印出错~~~~~~~~~~~~~
备注：VideoCapture.get()参数说明
| Enumerator | |
|---|---|
| CAP_PROP_POS_MSEC Python: cv.CAP_PROP_POS_MSEC |
Current position of the video file in milliseconds. |
| CAP_PROP_POS_FRAMES Python: cv.CAP_PROP_POS_FRAMES |
0-based index of the frame to be decoded/captured next. |
| CAP_PROP_POS_AVI_RATIO Python: cv.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 Python: cv.CAP_PROP_FRAME_WIDTH |
Width of the frames in the video stream. |
| CAP_PROP_FRAME_HEIGHT Python: cv.CAP_PROP_FRAME_HEIGHT |
Height of the frames in the video stream. |
| CAP_PROP_FPS Python: cv.CAP_PROP_FPS |
Frame rate. |
| CAP_PROP_FOURCC Python: cv.CAP_PROP_FOURCC |
4-character code of codec. see VideoWriter::fourcc . |
| CAP_PROP_FRAME_COUNT Python: cv.CAP_PROP_FRAME_COUNT |
Number of frames in the video file. |
| CAP_PROP_FORMAT Python: cv.CAP_PROP_FORMAT |
Format of the Mat objects returned by VideoCapture::retrieve(). |
| CAP_PROP_MODE Python: cv.CAP_PROP_MODE |
Backend-specific value indicating the current capture mode. |
| CAP_PROP_BRIGHTNESS Python: cv.CAP_PROP_BRIGHTNESS |
Brightness of the image (only for those cameras that support). |
| CAP_PROP_CONTRAST Python: cv.CAP_PROP_CONTRAST |
Contrast of the image (only for cameras). |
| CAP_PROP_SATURATION Python: cv.CAP_PROP_SATURATION |
Saturation of the image (only for cameras). |
| CAP_PROP_HUE Python: cv.CAP_PROP_HUE |
Hue of the image (only for cameras). |
| CAP_PROP_GAIN Python: cv.CAP_PROP_GAIN |
Gain of the image (only for those cameras that support). |
| CAP_PROP_EXPOSURE Python: cv.CAP_PROP_EXPOSURE |
Exposure (only for those cameras that support). |
| CAP_PROP_CONVERT_RGB Python: cv.CAP_PROP_CONVERT_RGB |
Boolean flags indicating whether images should be converted to RGB. |
| CAP_PROP_WHITE_BALANCE_BLUE_U Python: cv.CAP_PROP_WHITE_BALANCE_BLUE_U |
Currently unsupported. |
| CAP_PROP_RECTIFICATION Python: cv.CAP_PROP_RECTIFICATION |
Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently). |
| 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） |
