CODEWITHSUNDEEP
pythonopencv
lilian
lilian

Reputation: 505

Can't write and save a video file using OpenCV and Python

I'm trying to process frames from a video stream, and it as a new video.

This is what I'm doing : 

fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('Videos/output.mp4',fourcc, fps, (1080,1080))

I keep getting : 

OpenCV: FFMPEG: tag 0x44495658/'XVID' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x00000020/' ???'

I think I'm using the wrong fourcc value... Which one should I use ? I've been trying a lot of them.

I'm using Ubuntu 16.04, Python 2.7.11 and OpenCV 3.1.0

Upvotes: 33

Views: 76212

Answers (11)

vvthai10
vvthai10

Reputation: 101

In my case, i use:

fourcc = cv2.VideoWriter_fourcc('m', 'p', '4', 'v')
video = cv2.VideoWriter(video_name, fourcc, FPS, (width,height))

and this work :>

Upvotes: 0

greatertomi
greatertomi

Reputation: 988

On a mac

writer = cv2.VideoWriter('mysupervideo.mp4', cv2.VideoWriter.fourcc(*'mp4v'), 20, (width, height))

Works better

Upvotes: -2

makeworld
makeworld

Reputation: 1742

I wanted to save as a .mp4, and using *"mp4v" turned out to be the right code, on Linux at least.

Check the example below

fourcc = cv2.VideoWriter_fourcc(*"mp4v")
video = cv2.VideoWriter('output.mp4', fourcc, fps, (width, height))

Upvotes: 2

sauravjoshi23
sauravjoshi23

Reputation: 877

Install K-Lite Mega Codec Pack: https://filehippo.com/download_klite_mega_codec/
This error occurs because some codecs are not available by default in Windows media player. So by installing this software, the video works fine with same code.

Upvotes: 1

user3900921
user3900921

Reputation: 1

If you are using linux try this

fourcc = 0x00000021
out = cv2.VideoWriter('Videos/output.mp4',fourcc, fps, (1080,1080))

Upvotes: 0

M.Vu
M.Vu

Reputation: 492

If you want to save video by opencv in mp4 format, let

Follow this link:

you should replace:

fourcc = cv2.VideoWriter_fourcc(*'XVID')

by:

fourcc = cv2.VideoWriter_fourcc(*'FMP4')

I tried and succeeded.

Upvotes: 3

Hariprasad
Hariprasad

Reputation: 406

The size of the frame(width,height) you are giving, should match the size of the frame you want to save. so
fw = int(cap.get(3)) fh = int(cap.get(4)) print("w,h",fw,fh) out = cv2.VideoWriter('fb1.avi',cv2.VideoWriter_fourcc('X','V','I','D'), fps, (fw,fh))

Upvotes: 3

Gonzalo Garcia
Gonzalo Garcia

Reputation: 6642

The problem that you are having is that you are trying to export the frames in XVID format but the name of your output file is ending with .mp4. You should change the export format to MP4V or the name of your output file to .avi.

fourcc = cv2.VideoWriter_fourcc(*'MP4V')
out = cv2.VideoWriter('Videos/output.mp4',fourcc, fps, (1080,1080))

alternative

fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('Videos/output.avi',fourcc, fps, (1080,1080))

here you can find more information about the video codecs

Upvotes: 7

werecow
werecow

Reputation: 21

I had the same problem. With me, it turned out that I had switched the height and width of the video, so the frame dimensions did not match the video specifications and as a result nothing was written. Make sure they match exactly.

Also, OpenCV seems to give that same warning if the file extension does not match the codec used. Specifically, it wants .avi for the XVID codec.

Upvotes: 2

Right leg
Right leg

Reputation: 16740

For Windows users

I am using OpenCV 2 with Python 3.6, on Windows 10.

The 'XVID' codec, along with producing a .avi file, seems to be the most generic solution (if not the only one that works).

fourcc = cv.VideoWriter_fourcc(*'XVID')
out = cv.VideoWriter('test.avi', fourcc, 60, (320, 240))

In addition, only BGR can be directly written with such a VideoWriter declaration. Don't try to write gray frames: the output would be empty.

Upvotes: 7

Amar
Amar

Reputation: 229

Define the codec and create VideoWriter object like this

fourcc = cv2.VideoWriter_fourcc(*'MPEG')
out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))

Upvotes: 22

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