Building opencv-python from Source: Solving the Videoio Off Error

Learn how to avoid file not found errors when building `opencv-python` from source with videoio off. Get clear solutions and steps to successfully compile your code.
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Building opencv-python from Source: Solving the Videoio Off Error

If you've ever attempted to compile opencv-python from source with specific modules disabled, you might have run into a frustrating issue where you see a file not found error. In this post, we'll discuss a common problem that developers face when building OpenCV and provide a detailed guide on how to solve it. Let's dive in!

The Problem

When trying to build opencv-python while disabling the videoio module, you may encounter an error message, such as:

[[See Video to Reveal this Text or Code Snippet]]

This error typically occurs because the build tries to reference a file that should not be required once the videoio module is disabled. Specifically, your Docker command may fail with the following:

[[See Video to Reveal this Text or Code Snippet]]

Your CMake arguments could include:

[[See Video to Reveal this Text or Code Snippet]]

The issue arises from attempting to disable videoio without also disabling the gapi module, which is interdependent on videoio.

Solution

To successfully build opencv-python without the videoio module, you’ll also need to disable the gapi module. Here's how you can adjust your CMake options:

Step-by-Step Guide to Adjust CMake Options

Open Your Dockerfile or Build Script: Locate the section where you set the CMAKE_ARGS.

Modify the CMake Arguments: Add the line to disable the gapi module:

[[See Video to Reveal this Text or Code Snippet]]

Updated CMake Arguments Example:
Here’s how your CMake command may look after the modifications:

[[See Video to Reveal this Text or Code Snippet]]

Rebuild Your Image: Now that you've modified the CMake arguments, use the following command to rebuild your Docker image:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Building opencv-python from source can be tricky, especially when disabling certain modules. However, by ensuring that interdependent modules are also turned off, you can avoid common errors. Remember: when you disable videoio, always consider the potential dependencies like gapi. Happy coding with OpenCV!