Solving the Infamous [Flutter]Error: Multiple Commands Produce ‘{FilePath}/Runner.app/Frameworks/libavcodec.framework’

Are you tired of pulling your hair out over the pesky “[Flutter]Error: Multiple commands produce ‘{FilePath}/Runner.app/Frameworks/libavcodec.framework'” error in Xcode? You’re not alone! This frustrating issue has plagued many a Flutter developer, causing hours of lost productivity and frustration. Fear not, dear reader, for we’re about to dive into a comprehensive guide on how to resolve this error once and for all.

What’s causing the error?

Before we dive into the solutions, let’s take a step back and understand what’s causing this error. The “[Flutter]Error: Multiple commands produce ‘{FilePath}/Runner.app/Frameworks/libavcodec.framework'” error occurs when there are multiple commands in your Xcode project that attempt to produce the same output file, specifically the libavcodec.framework file.

This usually happens when you have multiple dependencies or libraries in your project that rely on the same framework, resulting in a clash of commands during the build process. To resolve this, we need to identify the culprits and find a way to make them play nice together.

Solution 1: Remove duplicate dependencies

The first step in solving this error is to remove any duplicate dependencies in your project. Open your `pubspec.yaml` file and take a closer look at the dependencies listed. Check for any duplicate dependencies, such as multiple versions of the same library. Remove any unnecessary dependencies and ensure that you’re using the latest versions of the required libraries.

dependencies:
  flutter:
    sdk: flutter
  video_player: ^2.0.0
  chewie: ^0.11.0
  ffmpeg_kit: ^4.3.0

In the example above, we’ve removed any duplicate dependencies and ensured that we’re using the latest versions of the required libraries.

Solution 2: Update your Podfile

Next, let’s take a look at your Podfile. Open the file and add the following code:

post_install do |installer|
  installer.pods_project.targets.each do |target|
    if target.name == 'flutter_ffmpeg'
      target.xcconfig = {
        'OTHER_LDFLAGS' => '-ObjC',
      }
    end
  end
end

This code updates the Podfile to include the necessary configuration for the flutter_ffmpeg library, which is often the culprit behind this error.

Solution 3: Delete derived data and clean build folder

Sometimes, Xcode can get stuck in a state where it’s not properly cleaning up after itself. To resolve this, we need to delete the derived data and clean the build folder.

1. Close Xcode
2. Delete the derived data directory: rm -rf ~/Library/Developer/Xcode/DerivedData
3. Delete the build folder: rm -rf ~/project path/build
4. Open Xcode and clean the project: Product > Clean
5. Build the project again: Product > Build

By deleting the derived data and cleaning the build folder, we’re forcing Xcode to rebuild the project from scratch, which should resolve the error.

Solution 4: Disable parallel builds

In some cases, parallel builds can cause issues with Xcode. To disable parallel builds, follow these steps:

1. Open Xcode and navigate to Product > Scheme > Edit Scheme
2. Click on the “Build” tab
3. Uncheck the “Parallelize Build” option
4. Close the scheme editor and build the project again

Disabling parallel builds can help resolve the error, but keep in mind that it may increase build times.

Solution 5: Update Xcode and Flutter

Sometimes, the issue can be resolved simply by updating Xcode and Flutter to the latest versions.

Update Xcode by going to the App Store and checking for updates. Then, update Flutter by running the following command:

flutter upgrade

Once you’ve updated Xcode and Flutter, try building the project again to see if the error has been resolved.

Solution 6: Use a custom script

If none of the above solutions work, we can try using a custom script to resolve the issue. Add the following code to your `Build Phases` in Xcode:

# Type a script or drag a script file
/bin/sh
echo "Remove duplicate frameworks"
rm -rf ${BUILT_PRODUCTS_DIR}/${FRAMEWORKS_FOLDER_PATH}/libavcodec.framework

This script removes the duplicate libavcodec.framework file, which should resolve the error.

Conclusion

The “[Flutter]Error: Multiple commands produce ‘{FilePath}/Runner.app/Frameworks/libavcodec.framework'” error can be frustrating, but with these solutions, you should be able to resolve the issue and get back to building your Flutter app.

Remember to methodically work through each solution, and don’t be afraid to try a combination of solutions if needed. With patience and persistence, you’ll be saying goodbye to this error and hello to a successful build!

Solution	Description
Remove duplicate dependencies	Remove any duplicate dependencies in your project to prevent clashes during the build process.
Update your Podfile	Update your Podfile to include the necessary configuration for the flutter_ffmpeg library.
Delete derived data and clean build folder	Delete the derived data directory and clean the build folder to force Xcode to rebuild the project from scratch.
Disable parallel builds	Disable parallel builds to prevent issues with Xcode.
Update Xcode and Flutter	Update Xcode and Flutter to the latest versions to resolve any compatibility issues.
Use a custom script	Use a custom script to remove duplicate frameworks and resolve the error.

By following these solutions, you’ll be well on your way to resolving the “[Flutter]Error: Multiple commands produce ‘{FilePath}/Runner.app/Frameworks/libavcodec.framework'” error and building a successful Flutter app.

Frequently Asked Question

Having trouble with Flutter and Xcode? You’re not alone! Here are some frequently asked questions and answers to help you tackle the error “Multiple commands produce ‘{FilePath}/Runner.app/Frameworks/libavcodec.framework'”