How to export video as .mp4 using openCV?

问题:

I am trying to export video as .mp4 with openCV. I have tried several codecs but for now I had no success.

This is a function that constructs a video from frames:

def create_movie(self, out_directory, fps, total_frames):     img1 = cv2.imread("temp/scr0.png")     height, width, layers =  img1.shape     codec = cv2.cv.CV_FOURCC('X','V','I','D')     video = cv2.VideoWriter(out_directory, codec, fps, (width, height))      for i in range(total_frames):         img_name = "temp/scr" + str(i) + ".png"         img = cv2.imread(img_name)         video.write(img)      video.release()     cv2.destroyAllWindows() 

I usually get next error message, using different codecs:

Tag XVID/0x44495658 incompatible with output codec id '13' 

Is is possible to do this and how?

回答1:

There is a non-direct solution. You export as .avi and then convert to .mp4 using python's call which calls terminal command.

from subprocess import call  dir = out_directory.strip(".avi") command = "avconv -i %s.avi -c:v libx264 -c:a copy %s.mp4" % (dir, dir) call(command.split()) 

回答2:

May be a little bit late to answer this, but if you want to write an .MP4 file with OpenCV try this:

import cv2 #your previous code here  fourcc = cv2.VideoWriter_fourcc(*'a\0\0\0') out = cv2.VideoWriter('out.mp4', fourcc, fps, res)  #the character '\0' is the Null-Terminator or simply 0x00 in the ASCII-Table #tag: *'a\0\0\0' corresponds to 0x00000061  #your following code here 

文章来源: How to export video as .mp4 using openCV?