使用OpenCV Python旋转视频180
我是一个python初学者,因此提前为这些错误感到抱歉。 我正在尝试将视频旋转180度,然后处理我应该创建的视频 目前我正在这样做:使用OpenCV Python旋转视频180,python,opencv,video,rotation,video-capture,Python,Opencv,Video,Rotation,Video Capture,我是一个python初学者,因此提前为这些错误感到抱歉。 我正在尝试将视频旋转180度,然后处理我应该创建的视频 目前我正在这样做: import cv2 import numpy as np #that's my original video - the one that I want to rotate 180 degrees cap = cv2.VideoCapture('/Users/name/Desktop/VIDEO 12.05/PIC_P01.mp4')
import cv2
import numpy as np
#that's my original video - the one that I want to rotate 180 degrees
cap = cv2.VideoCapture('/Users/name/Desktop/VIDEO 12.05/PIC_P01.mp4')
frame_number = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
# Original Frames
frames = []
for i in range(frame_number):
ret, frame = cap.read()
frames.append(frame)
#here's where I try to rotate the video
new = cv2.rotate(frame, cv2.ROTATE_180)
cv2.imshow('output', new)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
#here I'm trying to write the new rotated video
newvideoR = cv2.VideoWriter('PIC_P01R.mp4',0x7634706d, 50, (360, 640))
for jj in range(len(new)):
newvideoR.write(new[jj])
newvideoR.release()
cap.release()
然而,最后,当我去读取文件时,我发现只有一个无法打开的空文件。
由此,我推断我所做的步骤中存在错误。
有人会对我该怎么做有什么建议吗
**我还尝试更改cv2.Videowriter上的参数(例如fps、size),但仍然无法工作您不需要累积帧,并将其写入另一个循环。
您可以在同一循环中读取帧、旋转帧和写入帧
- 获取宽度和高度:
frame_width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) frame_height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
- 在循环之前打开输出视频文件:
newvideoR = cv2.VideoWriter('output.mp4', cv2.VideoWriter_fourcc(*"mp4v"), 50, (frame_width, frame_height))
- 读取帧,旋转帧并将其写入循环:
for i in range(frame_number): ret, frame = cap.read() new = cv2.rotate(frame, cv2.ROTATE_180) cv2.imshow('output', new) if cv2.waitKey(1) & 0xFF == ord('q'): break newvideoR.write(new)
- 发布视频读写器:
newvideoR.release() cap.release()
完整的代码示例(我将文件命名为
input.mp4
和output.mp4
):
你能定义“仍然不工作”吗?你得到输出了吗?代码失败了吗?你怎么知道它不起作用?您是否可以发布错误消息?没有错误或警告消息。代码看起来很好,但最终我无法用任何程序打开视频(因为它是一个空视频)。效果很好!非常感谢您的清晰解释和示例。
import cv2
#that's my original video - the one that I want to rotate 180 degrees
cap = cv2.VideoCapture('input.mp4')
frame_number = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
# Get width and height
frame_width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
frame_height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
# here I'm trying to write the new rotated video
# Open the output video file before the loop, cv2.VideoWriter_fourcc(*"mp4v") = 0x7634706d
newvideoR = cv2.VideoWriter('output.mp4', cv2.VideoWriter_fourcc(*"mp4v"), 50, (frame_width, frame_height))
# Original Frames
#frames = []
for i in range(frame_number):
ret, frame = cap.read()
#frames.append(frame) # No need to append the original frames
#here's where I try to rotate the video
new = cv2.rotate(frame, cv2.ROTATE_180)
cv2.imshow('output', new)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
newvideoR.write(new)
newvideoR.release()
cap.release()