我想并排使用两个视频来编写视频文件,但最后输出文件无法在任何视频播放器中播放。这是我的代码:
from __future__ import print_function
import numpy as np
import argparse
import cv2
import tkinter as tk
from tkinter import filedialog
import os
import os.path
ap = argparse.ArgumentParser()
ap.add_argument("-o", "--output", type=str, default="sample.avi",
help="path to output video file")
ap.add_argument("-f", "--fps", type=int, default=100.0,
help="FPS of output video")
ap.add_argument("-c", "--codec", type=str, default="MJPG",
help="codec of output video")
args = vars(ap.parse_args())
root = tk.Tk()
root.withdraw()
source_video = filedialog.askopenfilename(title="Select file")
sign = filedialog.askopenfilename(title="Select file")
print("[INFO] Capturing video...")
cap1 = cv2.VideoCapture(source_video)
cap2 = cv2.VideoCapture(sign)
fourcc = cv2.VideoWriter_fourcc(*args["codec"])
writer = None
(h, w) = (None, None)
zeros = None
i = 0
try:
while cap1.isOpened():
ret, frame1 = cap1.read()
if ret:
frame1 = cv2.resize(frame1, (0, 0), fx=0.5, fy=0.5)
(h, w) = frame1.shape[:2]
ret, frame2 = cap2.read()
if ret:
frame2 = cv2.resize(frame2, (w, h))
else:
break
if writer is None:
writer = cv2.VideoWriter(args["output"], fourcc, args["fps"],
(h, w*2), True)
zeros = np.zeros((h, w*2), dtype="uint8")
output = np.zeros((h, w*2, 3), dtype="uint8")
if frame2 is None:
output[0:h, 0:w] = frame1
writer.write(output)
else:
output[0:h, 0:w] = frame1
output[0:h, w:w * 2] = frame2
writer.write(output)
cv2.imshow('output', output)
if cv2.waitKey(25) & 0xFF == ord('q'):
break
writer.release()
cv2.destroyAllWindows()
except Exception as e:
print(str(e))
我没有得到任何错误所有的事情进展顺利,但当我尝试播放目录中的输出视频文件时,它将无法播放。我也检查文件大小约16KB。我不知道问题出在哪里。请帮我。我正在使用:Windows 10 64位Python3.7 Pycharm作为IDE
frameSize
的VideoWriter
参数是(宽度,高度),它有点隐藏在文档中(例如,here)。所以在你的代码中,它应该是
writer = cv2.VideoWriter(args["output"], fourcc, args["fps"], (w*2, h), True)
完成此修复后,您的代码为我制作了工作视频。
我注意到你的代码从输入视频“学习”帧大小而不是帧率,但我认为这是故意的。