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python - python - 如何通过python降低cv2中.PNG到MP4转换器的帧速率？

问题描述

我已经尝试过很多次都没有成功地改变帧速率以使视频变慢，out = cv2.VideoWriter(fps=2.5)但一般来说，它的执行速度并没有变慢，为什么？任何想法来解决这个问题？另外，如果有人有直接将图片转换为的解决方案，我将不胜感激gif

import cv2
import argparse
import os

# Construct the argument parser and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-ext", "--extension", required=False, default='png', help="extension name. default is 'png'.")
ap.add_argument("-o", "--output", required=False, default='output.mp4', help="output video file")
args = vars(ap.parse_args())

# Arguments
dir_path = '.'
ext = args['extension']
output = args['output']

images = []
for f in os.listdir(dir_path):
    if f.endswith(ext):
        images.append(f)

# Determine the width and height from the first image
image_path = os.path.join(dir_path, images[0])
frame = cv2.imread(image_path)
cv2.imshow('video',frame)
height, width, channels = frame.shape

# Define the codec and create VideoWriter object
fourcc = cv2.VideoWriter_fourcc(*'mp4v') # Be sure to use lower case
out = cv2.VideoWriter(output, fourcc, 1.5, (width, height))

for image in images:

    image_path = os.path.join(dir_path, image)
    frame = cv2.imread(image_path)

    out.write(frame) # Write out frame to video

    cv2.imshow('video',frame)
    if (cv2.waitKey(1) & 0xFF) == ord('q'): # Hit `q` to exit
        break

# Release everything if job is finished
out.release()
cv2.destroyAllWindows()

print("The output video is {}".format(output))

标签： pythonopencvmp4frame-ratecv2

解决方案

使用以下代码将图像转换为 gif 文件：

import os
import imageio

dir_path = 'path/to/gifFolder/'
img_folder_path = 'path/to/imagefolder/'

images = []
for f in os.listdir(img_folder_path):
    if f.endswith('jpg'):
        images.append(f)

videowriter = imageio.get_writer(dir_path+'movie.gif', fps=5) 
for filename in images[0:30]:
    print(filename)
    img = imageio.imread(img_folder_path+filename)
    videowriter.append_data(img)

videowriter.close()

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