OpenCV cannot open *.mp4 file

Question

I am trying open *.mp4 file with opencv. I am trying with following code but I am unable to do this. How can solve this issue?

import cv2
cap = cv2.VideoCapture("test.mp4")
# cap = cv2.VideoCapture("test.avi") # it's also not working
cap.isOpened() # Output: False

take a look [here](http://answers.opencv.org/question/9692/mp4-reading/) most likely you are missing a codec for mp4 — Sembei Norimaki, Mar 15 '18 at 12:21
Please check everything listed in the linked answer. If it doesn't work, let me know and I'll reopen the question — Miki, Mar 15 '18 at 12:33
@Miki , I tried to solve this `linked answer` but it doesn't work.. — Md. Rezwanul Haque, Mar 15 '18 at 12:52
Please explain why the [linked answer](https://stackoverflow.com/questions/47112642/permanent-fix-for-opencv-videocapture) doesn't work — Miki, Mar 15 '18 at 12:54
After executing this `ffmpeg -codecs | grep -i avc` I got this ` DEV.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_crystalhd h264_vdpau ) (encoders: libx264 libx264rgb ) D.A.L. avc On2 Audio for Video Codec (decoders: on2avc ) ` — Md. Rezwanul Haque, Mar 15 '18 at 12:56
python -c "import cv2; print(cv2.getBuildInformation())" | grep -i ffmpeg FFMPEG: NO — Md. Rezwanul Haque, Mar 15 '18 at 12:57
_"If the output is No then follow an online guide to build OpenCV from source with ffmpeg support."_ — Miki, Mar 15 '18 at 13:00

score 2 · Answer 1 · answered Feb 28 '19 at 20:58

I don't know if this post up-to-date. However, I had the same problem on Ubuntu 18.4 and had installed the opencv via conda:

conda install --channel https://conda.anaconda.org/menpo opencv3

And it turned out that menpo is not supported anymore. After installing from conda-forge, the problem disappeared:

conda install -c conda-forge opencv

You can surely check if the mpeg support is there:

python -c "import cv2; print(cv2.getBuildInformation())" | grep -i ffmpeg

it should return "YES"

score 2 · Answer 2 · answered May 25 '19 at 17:07

2

install this package, it enable ffmpeg in opencv:

pip install opencv-contrib-python

answered May 25 '19 at 17:07

ED-DOUGHMI younes

score 1 · Answer 3 · answered Nov 16 '21 at 14:51

1

Install this package

pip install VideoCapture

import cv2
cap = cv2.VideoCapture("test.mp4")
# cap = cv2.VideoCapture("test.avi")
cap.isOpened() 

cap.release()

answered Nov 16 '21 at 14:51

Serdar Azamatov

score 0 · Answer 4 · answered Mar 15 '18 at 12:27

0

answered Mar 15 '18 at 12:27

4 Answers4