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HomeBackend DevelopmentPython TutorialHow to combine pictures into video files (MP4) using Python?

    python图片生成视频MP4

    import os
    import cv2
    
    # 要被合成的多张图片所在文件夹
    # 路径分隔符最好使用“/”,而不是“\”,“\”本身有转义的意思;或者“\\”也可以。
    # 因为是文件夹,所以最后还要有一个“/”
    file_dir = 'C:/Users/YUXIAOYANG/Desktop/tset/'
    list = []
    for root ,dirs, files in os.walk(file_dir):
        for file in files:
            list.append(file)      # 获取目录下文件名列表
    
    # VideoWriter是cv2库提供的视频保存方法,将合成的视频保存到该路径中
    # 'MJPG'意思是支持jpg格式图片
    # fps = 5代表视频的帧频为5,如果图片不多,帧频最好设置的小一点
    # (1280,720)是生成的视频像素1280*720,一般要与所使用的图片像素大小一致,否则生成的视频无法播放
    # 定义保存视频目录名称和压缩格式,像素为1280*720
    video = cv2.VideoWriter('C:/Users/YUXIAOYANG/Desktop/test.mp4',cv2.VideoWriter_fourcc('m', 'p', '4', 'v'),5,(1981,991))
    
    for i in range(1,len(list)):
        img = cv2.imread('C:/Users/YUXIAOYANG/Desktop/tset/'+list[i-1]) #读取图片
        print(img.shape)
        #img = cv2.resize(img,(1981,991)) #将图片转换为1280*720像素大小
        video.write(img) # 写入视频
        
    # 释放资源
    video.release()

    python图片与视频互转(亲测有效)

    图片转视频

    1.任务需求背景

    在标注数据的过程中,需要【反复】浏览大量图片(万张以上的数量级),确认图片中的目标类别以及室内户型布局。

    但是,在电脑上浏览图片有很大的不足:(a)需要持续点击鼠标或者键盘;(b)图片加载跟不上点击速度。 

    值得注意的是:网上有很多代码(图片转视频),但是真正能用的几乎很少,本博文的代码经过测试,可以成功生成视频。

    2.代码依赖库

    opencv-python==4.5.2
    numpy==1.19.2
    glob(python自带模块)

    3.代码实战

    基本步骤如下:

    • a. 使用glob获取路径下的所有图片;  

    • b. cv2.imread()读取所有图片;  

    • c. 将读取的图片存储在新的列表中,img_array;  

    • d. 使用cv2.VideoWriter()创建VideoWriter对象,注意参数的设置;  

    • e. 使用cv2.VideoWriter().write()保存 img_array 中的每一帧图像到视频文件;  

    • f. 释放 VideoWriter对象;

    import cv2
    import numpy as np
    import glob
    import os
    
    # 其它格式的图片也可以
    img_array = []
    for filename in glob.glob('E:/3DS1Data/20211118/29984CRL30V00067087/dataset/rgb/*.png'):
        img = cv2.imread(filename)
        height, width, layers = img.shape
        size = (width, height)
        img_array.append(img)
    
    # avi:视频类型,mp4也可以
    # cv2.VideoWriter_fourcc(*'DIVX'):编码格式
    # 5:视频帧率
    # size:视频中图片大小
    out = cv2.VideoWriter('E:/3DS1Data/20211118/29984CRL30V00067087/dataset/project-all.avi',
                          cv2.VideoWriter_fourcc(*'DIVX'),
                          5, size)
    
    for i in range(len(img_array)):
        out.write(img_array[i])
    out.release()

    注意事项

    通过测试发现,Mp4格式的视频清晰度低于 Avi 视频的清晰度。

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