video-capture - 类型错误 : VideoWriter() missing required argument 'frameSize' (pos 5) with opencv-python ==4. 4.0.42

Question

我想使用以下代码创建 VideoWriter:
Fourcc = cv2.VideoWriter_fourcc(*'mp4v')
video_writer = cv2.VideoWriter('out.mp4',fourcc,fps,(frame_width,frame_height))
但我收到错误:
类型错误:VideoWriter() 缺少必需的参数“frameSize”(位置 5)
当我将代码更改为:
Fourcc = cv2.VideoWriter_fourcc(*'mp4v')
video_writer = cv2.VideoWriter(filename='out.mp4',fourcc=fourcc,fps=fps,frameSize=(frame_width,frame_height))
我收到另一个错误:
类型错误:VideoWriter() 缺少必需的参数“apiPreference”(位置 2)
所以我将代码更改为:
Fourcc = cv2.VideoWriter_fourcc(*'mp4v')
video_writer = cv2.VideoWriter(filename='out.mp4',apiPreference=0,fourcc=fourcc,fps=fps,frameSize=(frame_width,frame_height))
我得到错误:
类型错误:VideoWriter() 缺少必需的参数“params”(位置 6)
我怎么能解决呢？谁能告诉我如何使用 api:VideoWriter()？非常感谢

Answer 1

好的，以下代码对我有用:

frame_num = int(Cap.get(cv2.CAP_PROP_FRAME_COUNT))
frame_width = int(Cap.get(cv2.CAP_PROP_FRAME_WIDTH))
frame_height = int(Cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
video_writer = cv2.VideoWriter(result,fourcc,fps,(frame_width,frame_height))

Cap.get(cv2.*) 的类型是浮点数，所以我把它改成整数