这篇文章主要介绍“Python如何实现视频分帧”的相关知识，小编通过实际案例向大家展示操作过程，操作方法简单快捷，实用性强，希望这篇“Python如何实现视频分帧”文章能帮助大家解决问题。
下载依赖
pip install opencv-python==4.0.0.21
实现
方法一
def video_to_frames(video_path, outPutDirName):
"""
抽取视频帧存为图片
:param video_path:
:param outPutDirName:
:return:
"""
times = 0
# 提取视频的频率，每1帧提取一个
frame_frequency = 1
# 如果文件目录不存在则创建目录
if not os.path.exists(outPutDirName):
os.makedirs(outPutDirName)
# 读取视频帧
camera = cv2.VideoCapture(video_path)
while True:
times = times + 1
res, image = camera.read()
if not res:
print('not res , not image')
break
# 按照设置间隔存储视频帧
if times % frame_frequency == 0:
create_path = os.path.join(outPutDirName, f"{str(times)}.jpg")
cv2.imwrite(create_path, image)
logger.info('图片提取结束')
# 释放摄像头设备
camera.release()
def image_to_video(image_path, media_path, fps):
'''
图片合成视频函数
:param image_path: 图片路径
:param media_path: 合成视频保存路径
:return:
'''
# 获取图片路径下面的所有图片名称
image_names = os.listdir(image_path)
# 对提取到的图片名称进行排序
image_names.sort(key=lambda n: int(n[:-4]))
# 设置写入格式
fourcc = cv2.VideoWriter_fourcc('M', 'P', '4', 'V')
# 设置每秒帧数
fps = fps
# 读取第一个图片获取大小尺寸，因为需要转换成视频的图片大小尺寸是一样的
image = Image.open(os.path.join(image_path, image_names[0]))
# 初始化媒体写入对象
media_writer = cv2.VideoWriter(media_path, fourcc, fps, image.size)
# 遍历图片，将每张图片加入视频当中
for image_name in image_names:
im = cv2.imread(os.path.join(image_path, image_name))
media_writer.write(im)
# 释放媒体写入对象
media_writer.release()
logger.info('无声视频写入完成！')方法二
import numpy as np
import cv2
import os
import sys
def cut(video_file, target_dir):
cap = cv2.VideoCapture(video_file) # 获取到一个视频
isOpened = cap.isOpened # 判断是否打开
# 为单张视频，以视频名称所谓文件名，创建文件夹
temp = os.path.split(video_file)[-1]
dir_name = temp.split('.')[0]
single_pic_store_dir = os.path.join(target_dir, dir_name)
if not os.path.exists(single_pic_store_dir):
os.mkdir(single_pic_store_dir)
i = 0
while isOpened:
i += 1
(flag, frame) = cap.read() # 读取一张图像
fileName = 'image' + str(i) + ".jpg"
if (flag == True):
# 以下三行 进行 旋转
#frame = np.rot90(frame, -1)
#print(fileName)
# 设置保存路径
save_path = os.path.join(single_pic_store_dir, fileName)
#print(save_path)
res = cv2.imwrite(save_path, frame, [cv2.IMWRITE_JPEG_QUALITY, 70])
#print(res)
else:
break
return single_pic_store_dir
if __name__ == '__main__':
video_file = 'I:/crack.avi'
cut(video_file, 'I:/data/')方法三
#!/usr/bin/env python
import cv2
numer = 18
cap=cv2.VideoCapture("/home/linux/work/python/video/"+str(numer)+".mp4")
if cap.isOpened():
ret,frame=cap.read()
else:
ret = False
n=0
i=0
timeF = 40
path='/home/linux/work/python/video/'+str(numer)+'/{}'
while ret:
n = n + 1
ret,frame=cap.read()
if (n%timeF == 0) :
i = i+1
print(i)
filename=str(numer)+"_"+str(i)+".jpg"
cv2.imwrite(path.format(filename),frame)
cv2.waitKey(1)
cap.release()补充
除了视频分帧，Python还可以将帧合成视频流，下面是实现代码
#!/usr/bin/env python
import cv2
img = cv2.imread('/home/linux/work/python/img/1_475.jpg')
imginfo = img.shape
size = (imginfo[1],imginfo[0])
print(size)
fourcc = cv2.VideoWriter_fourcc(*"mp4v")
videoWrite = cv2.VideoWriter('/home/linux/work/python/2.mp4',fourcc,10,size)
for i in range(475,2208):
filename = '/home/linux/work/python/img/1_'+str(i)+'.jpg'
img = cv2.imread(filename,1)
videoWrite.write(img)
print(i)
videoWrite.release()
print('end')