python3 opencv獲取視頻的總幀數介紹+獲取視頻各種參數介紹

• 獲取視頻總幀數

import cv2
 
cap=cv2.VideoCapture(path)
 
#get方法參數按順序對應下表（從0開始編號，比如這里為了獲取視頻的總幀數，在下表是排第八個的 CV_CAP_PROP_FRAME_COUNT
frames_num=cap.get(7)

• opencv參數列表

0 CV_CAP_PROP_POS_MSEC Current position of the video file in milliseconds or video capture timestamp.
1 CV_CAP_PROP_POS_FRAMES 0-based index of the frame to be decoded/captured next.
2 CV_CAP_PROP_POS_AVI_RATIO Relative position of the video file: 0 - start of the film, 1 - end of the film.
3 CV_CAP_PROP_FRAME_WIDTH    #視頻幀寬度
4 CV_CAP_PROP_FRAME_HEIGHT    #視頻幀高度
5 CV_CAP_PROP_FPS            #視頻幀速率
6 CV_CAP_PROP_FOURCC 4-character code of codec.
7 CV_CAP_PROP_FRAME_COUNT  #視頻總幀數
8 CV_CAP_PROP_FORMAT Format of the Mat objects returned by retrieve() .
9 CV_CAP_PROP_MODE Backend-specific value indicating the current capture mode.
10 CV_CAP_PROP_BRIGHTNESS Brightness of the image (only for cameras).
11 CV_CAP_PROP_CONTRAST Contrast of the image (only for cameras).
12 CV_CAP_PROP_SATURATION Saturation of the image (only for cameras).
13 CV_CAP_PROP_HUE Hue of the image (only for cameras).
14 CV_CAP_PROP_GAIN Gain of the image (only for cameras).
15 CV_CAP_PROP_EXPOSURE Exposure (only for cameras).
16 CV_CAP_PROP_CONVERT_RGB Boolean flags indicating whether images should be converted to RGB.
17 CV_CAP_PROP_WHITE_BALANCE_U The U value of the whitebalance setting (note: only supported by DC1394 v 2.x backend currently)
18 CV_CAP_PROP_WHITE_BALANCE_V The V value of the whitebalance setting (note: only supported by DC1394 v 2.x backend currently)
19 CV_CAP_PROP_RECTIFICATION Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently)
20 CV_CAP_PROP_ISO_SPEED The ISO speed of the camera (note: only supported by DC1394 v 2.x backend currently)
21 CV_CAP_PROP_BUFFERSIZE Amount of frames stored in internal buffer memory (note: only supported by DC1394 v 2.x backend currently)