opencv 视频文件黑屏检测
时间: 2023-06-26 16:04:42 浏览: 95
如果您想检测视频文件中的黑屏,您可以使用 OpenCV 库中的以下方法:
1. 读取视频文件并获取帧数和帧率
```python
import cv2
video = cv2.VideoCapture('path/to/video.mp4')
fps = video.get(cv2.CAP_PROP_FPS)
frame_count = int(video.get(cv2.CAP_PROP_FRAME_COUNT))
```
2. 遍历每一帧并检测它们的颜色
```python
black_frames = []
for i in range(frame_count):
ret, frame = video.read()
if not ret:
break
# 计算每个像素的亮度值,并将其加起来
brightness = int(cv2.sumElems(cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY))[0])
# 如果亮度低于某个阈值,则将这一帧添加到黑屏帧列表中
if brightness < threshold:
black_frames.append(i)
```
3. 打印黑屏帧列表和黑屏持续时间
```python
black_duration = []
for i in range(len(black_frames)):
start = black_frames[i]
end = black_frames[i+1] if i+1 < len(black_frames) else frame_count
duration = (end - start) / fps
black_duration.append(duration)
print("Black screen frames:", black_frames)
print("Black screen duration:", black_duration)
```
请注意,您需要选择一个适合您视频的亮度阈值。您可以通过尝试不同的值来找到最佳的阈值。