what is the codec for mp4 videos in python OpenCV

Question

fourcc = cv2.cv.CV_FOURCC(*'XVID') 

The above line is used for avi video. In the same fashion, which codec do we use for mp4 videos in Ubuntu?

Answer 1

You can also use mp4v

fourcc = cv2.VideoWriter_fourcc(*'mp4v') 

where the videowriter should look like this:

out = cv2.VideoWriter('output.mp4',fourcc, 15, size) 

But there are more codecs available for mp4. You can see the list of them by setting fourcc = -1, it will show a list like this:

OpenCV: FFMPEG: format mp4 / MP4 (MPEG-4 Part 14) fourcc tag 0x7634706d/'mp4v' codec_id 000C fourcc tag 0x31637661/'avc1' codec_id 001B fourcc tag 0x33637661/'avc3' codec_id 001B fourcc tag 0x31766568/'hev1' codec_id 00AD fourcc tag 0x31637668/'hvc1' codec_id 00AD fourcc tag 0x7634706d/'mp4v' codec_id 0002 fourcc tag 0x7634706d/'mp4v' codec_id 0001 fourcc tag 0x7634706d/'mp4v' codec_id 0007 fourcc tag 0x7634706d/'mp4v' codec_id 003D .... 

All of them supports mp4 but h264 is supported by Web browsers if you want to serve the video into the web.

Answer 2

The codec is H.264.

One of these should work for you:

fourcc = cv2.VideoWriter_fourcc(*'h264') #or  #fourcc = cv2.VideoWriter_fourcc(*'x264') #or #fourcc = cv2.VideoWriter_fourcc(*'mp4v') 

However, I should warn you that you'll probably need to have ffmpeg and the x264 libraries installed so since you are in Ubuntu, try doing this command in the terminal:

sudo apt-get install ffmpeg x264 libx264-dev 

Also, check out this link from OpenCV tutorials for more details as to the kinds of FourCC codes available for your platform.

In the above link, it says X264 is the FourCC code you should use, but switch between them until you get it to work.