ImportError: libavcodec.so.56: cannot open shared object file: No such file or directory

[inzamam-iqbal]

I did exactly as you said. but when I type import cv2 it gives an error "ImportError: libavcodec.so.56: cannot open shared object file: No such file or directory"

[lewj85]

Having the same problem.

[jabelone]

Did you install all of the dependencies in the prior steps?

[jabelone]

The build is also a little out of date, so it could be that too. I'll try to make an updated version soon.

[kglasnapp]

I am also having the problem. I work with a bunch of student on a First Robotics Team and they would love it if you could update the build to avoid the ImportError: libavcodec.so.5 prolem.

Thanks so much for you efforts.

[lewj85]

An update would be appreciated by our robotics team over at NYU as well!

[rbirkby]

This must be a raspbian stretch related issue. I have reverted to a fresh (most recent) jessie image and it works:

>>> import cv2
>>> cv2.__version__
'3.1.0'

[kglasnapp]

Thank rbirkby how do you get the latest jessie image?

[rbirkby]

https://downloads.raspberrypi.org/raspbian_lite/images/raspbian_lite-2017-07-05/

[kglasnapp]

Thanks -- sadly when the command
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
runs it installs libavcodec.so.57.
When the import cv2 runs it expects libavcodec.so.56
Even with the version you suggested above.

Could we somehow rebuild the latest-OpenCV.deb so it has the latest version of opencv.

Thanks so much for you efforts. I hope we can find a solution.

[rbirkby]

Strange. That was not my experience. My only deviation from the script was to install numpy with apt instead of pip.

[kglasnapp]

rbirkby -- Did you start with clean Jessie build? Did you do sudo apt-get upgrade? I wonder why yours worked and mine failed.

[rbirkby]

Yes. Burned it to an sd card. apt-get update/upgrade.

[kglasnapp]

rbirkby -- Thanks so very much. It finally worked. I do not know what I did wrong.

Keith

[AadityaRavindran]

I faced the same issue @kglasnapp
I have the 57 version of libavcodec.

I uninstalled this version and installed opencv using this(Takes less than 5 min!) and it works like a charm:
sudo apt-get install libopencv-dev python-opencv python-picamera

[ghost]

hey @inzi119 did you find the solution to the problem because i m also getting same problem.

[maxisme]

I also am having this issue!

[Degeerdoethetweer]

Hi! I'm also having this issue. Has anyone managed to find a solution?

EDIT: Using an older version of Jessie solved it for me.
( https://downloads.raspberrypi.org/raspbian/images/raspbian-2017-07-05/ )

[iaansari]

Got it working on my Pi Zero W with Jessie. Does not work on the latest release of Raspbian "Stretch", but starting fresh with Jessie was smooth sailing.

[wbadry]

if @jabelone could recompile the latest version of OpenCV with Raspberry Stretch, this would be much appreciated.

[jabelone]

Recompiling a 3.4 version now.

[javacasm]

Sorry, but Where is the 3.4 version?

Thanks for your work!!!

[CosmaP]

Hi, I am still getting this issue.

[lukinsb]

Hello, I am still having this issue too.

[sarim987]

I am also having this issue, could you please update it?

[danarnold]

For those still having this issue, search your distro's package manager for compatibility libraries. On Arch Linux, I was able to install ffmpeg-compat-57 and get it working.

[nathangonzalez95]

@danarnold I am new to Linux and RPi. Would you be able to give a few more details or resources on how to install ffmpeg-compat-57? Any help is much appreciated,

[danarnold]

@nathangonzales95 You need to search your distribution's package manager for a compatibility library for this older version of ffmpeg. Or, you could try downgrading your version of ffmpeg. I'm using a desktop running Arch Linux, not a raspberry pi, so I don't know anything about your system.

[Alexander-flyer]

@danarnold
installing ffmpeg version(2.8.6) is work, thanks a lot~

[srohit0]

Installing opencv-contrib-python resolved this issue on 18.04.2 LTS (Bionic Beaver)

pip install opencv-contrib-python