OpenCV3 error: “Unable to stop the stream: Inappropriate ioctl for device”

Question

I\'m trying to read the frames of an .mov file using OpenCV 3.2 (from the menpo conda channel). I\'m using Python 3.5.3 through Anaconda on an Ubuntu 16.04 64-bit setup.

Answer 1

I faced the same problem with Anaconda private env & Python 3.5 on Ubuntu 16.04 .

Initially installed Opencv3 using

conda install -c menpo opencv3

Solution:

1. Remove Opencv3 conda remove opencv3

2. Install Opencv3 using pip install opencv-contrib-python

If the problem still persists:

1. Uninstall OpenCV
2. Install dependencies sudo apt-get install ffmpeg sudo apt-get install libavcodec-dev libavformat-dev libavdevice-dev
3. Reinstall Opencv using step 2.

Answer 2

Solved the problem by getting around it entirely.

Used the opencv-feedstock recipe of OpenCV for conda-forge. In the recipe folder is the build information for conda. I modified the build.sh file, changing the following options:

-DBUILD_PNG=1
-DBUILD_JPEG=1
-DWITH_CUDA=1
-DWITH_FFMPEG=1

ran conda build --numpy 1.12 recipe from the parent directory (had to specify the NumPy version, as the build script requirement lists numpy x.x which means you have to provide the version at runtime), and waited.

Took forever (seriously, a couple hours on a very powerful machine--the time sink is CUDA), but the build eventually completed successfully.

Then it was just a matter of installing the locally-built bz2 archive (conda install --use-local opencv). No more weird ioctl error messages, and the above script worked just fine.