Question

我正在Spyder中使用openCV模块将黑色矩形放在文件夹内的所有视频文件上。在每个视频上都放一个黑色矩形之后，我调整帧的大小并将其写到新的视频文件中。该输出视频的大小为2GB，而原始输入视频的大小仅为155MB。为了获得具有与输入视频完全相同的属性（大小，分辨率，总帧数...）的输出视频，我应该怎么做？

我的代码如下。调整大小时可能是我做错了事，还是VideoWriter使用了错误的参数？

谢谢。

import numpy as np
import cv2
import os

directory = "OUTPUT_Anonymous_Blackbox_videos"
parent_dir = os.path.dirname(os.getcwd())
path = os.path.join(parent_dir, directory)
try:
    os.mkdir(path)
except OSError:
    print("Creation of the directory %s failed" % path)
else:
    print("Successfully created the directory %s " % path)
os.chdir(parent_dir + '\Merged_videos')
video_list = os.listdir()
for f in video_list:
    next_video_name, img_type = os.path.splitext(f) 
    cap = cv2.VideoCapture(next_video_name + img_type)
    fourcc = cv2.VideoWriter_fourcc('h','2','6','4')
    out = cv2.VideoWriter(path + '/' + next_video_name + '_blackbox' + img_type,fourcc, 25.0, (1920,1080))

    while(cap.isOpened()):
        ret, frame = cap.read()
        if ret==True:
            frame = cv2.rectangle(frame,(1310,40),(1850,100),(0,0,0),cv2.FILLED)
            frame = cv2.resize(frame, (1920, 1080), interpolation = cv2.INTER_LINEAR) 
            out.write(frame)
            # cv2.imshow('frame',frame)
            # if cv2.waitKey(1) & 0xFF == ord('q'):
                # break
        else:
            cap.release()
            out.release()
            cv2.destroyAllWindows()

使用OpenCV VideoWriter的视频文件大小问题

0 个答案: