python - 在 OpenCV 上全屏播放视频

Question

------------编辑------------

我已经简化了我原来的查询，因为大多数人都不理解。

------------编辑------------

您好，我想使用 OpenCV 全屏显示视频，但不确定如何操作。到目前为止，这是我的代码，是的，我是新手，但你必须从某个地方开始。我正在运行 Python 3.6.3

问题:如何使用 OpenCV 全屏显示视频？

import cv2
import numpy as np
import os
os.environ['SDL_VIDEO_CENTERED'] = '1'
cap = cv2.VideoCapture("video.mp4")
cv2.namedWindow("window", cv2.WND_PROP_FULLSCREEN)
cv2.setWindowProperty("video.mp4",cv2.WND_PROP_FULLSCREEN,cv2.WINDOW_FULLSCREEN)
while(cap.isOpened()):
  ret, frame = cap.read()
  if ret == True:
    cv2.imshow('Frame',frame)
    if cv2.waitKey(30) & 0xFF == ord('q'):
      break
  else:
    break
cap.release()
cv2.destroyAllWindows()

我也遇到这个错误

Traceback (most recent call last): File "C:/Users/A/Desktop/vid.py", line 7, in cv2.setWindowProperty("video.mp4",cv2.WND_PROP_FULLSCREEN,cv2.WINDOW_FULLSCREEN) cv2.error: C:\projects\opencv-python\opencv\modules\highgui\src\window_w32.cpp:443: error: (-27) NULL window in function cvSetModeWindow_W32

Answer 1

感谢 Dan Mašek，我最初问题的答案是:

import cv2
import numpy as np

file_name = "video location here"
window_name = "window"
interframe_wait_ms = 30

cap = cv2.VideoCapture(file_name)
if not cap.isOpened():
    print("Error: Could not open video.")
    exit()

cv2.namedWindow(window_name, cv2.WND_PROP_FULLSCREEN)
cv2.setWindowProperty(window_name, cv2.WND_PROP_FULLSCREEN, cv2.WINDOW_FULLSCREEN)

while (True):
    ret, frame = cap.read()
    if not ret:
        print("Reached end of video, exiting.")
        break

    cv2.imshow(window_name, frame)
    if cv2.waitKey(interframe_wait_ms) & 0x7F == ord('q'):
        print("Exit requested.")
        break

cap.release()
cv2.destroyAllWindows()

Pastebin