Based on your pubspec.yaml, it looks like your assets are currently located within the lib folder.

In the following line:

File videoTempFile1 = await copyAssetFile("assets/asuka.mp4");

You're referencing the asset path incorrectly.

I recommend moving your assets to a dedicated assets/ directory at the root of your project (outside the lib folder). This not only resolves path-related issues but also keeps your project structure clean and organized.