OpenCV VideoCapture.get()获取帧率错误

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https://docs.opencv.org/4.2.0/d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c...

JoannaJuanCV

4382人浏览 · 2019-12-25 09:34:18

JoannaJuanCV · 2019-12-25 09:34:18 发布

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

https://docs.opencv.org/4.2.0/d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c4f5704daf01bc92359d2abc9e6eeb5cbe36d9af2

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）