I want to capture video from a webcam and save it to an mp4 file using opencv I found example code on stackoverflow below that works great The only hitch is that I m trying to save it as mp4 not avi Part of what I don t get is that the XVID argument passed to the FOURCC writer is supposed to be I think an mp4 codec from this link If I change the filename to output mp4 it tells me that the tag is invalid so I have to believe that the XVID codec is actually making an avi file Is this a stupid question How do I write to an mp4 I have found links showing how to convert an avi to an mp4 after the fact but that seems inefficient Seems like I should be able to do it during the initial write import numpy as np import cv2 cap cv2 VideoCapture 0 Define the codec and create VideoWriter object fourcc cv2 cv CV FOURCC XVID out cv2 VideoWriter output avi fourcc 20 0 640 480 while cap isOpened ret frame cap read if ret True frame cv2 flip frame 0 write the flipped frame out write frame cv2 imshow frame frame if cv2 waitKey 1 amp 0xFF ord q break else break Release everything if job is finished cap release out release cv2 destroyAllWindows

Writing an mp4 video using python opencv

The Solution to Writing an mp4 video using python opencv is

This worked for me.

self._name = name + '.mp4'
self._cap = VideoCapture(0)
self._fourcc = VideoWriter_fourcc(*'MP4V')
self._out = VideoWriter(self._name, self._fourcc, 20.0, (640,480))

~ Answered on 2017-01-15 21:41:14

Writing an mp4 video using python opencv

The Solution to Writing an mp4 video using python opencv is

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