Fix reader import error

[huochaitiantang]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @huochaitiantang, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily addresses an import error by refactoring several module imports to be conditional, ensuring they are loaded only when needed. It also enhances the robustness of the VAController lifecycle management to prevent runtime errors and updates a configuration default for frame slicing. Additionally, new external libraries have been added to the project's dependencies, indicating potential new features or expanded functionality.

Highlights

• Conditional Imports Refactoring: The imports for VAReader, OmniVAReader, VARecorder, and X264VARecorder in va_controller.py have been refactored from top-level to conditional imports within their respective initialization methods. This change likely resolves import errors and optimizes module loading.
• Robust VAController Handling: Error handling for the VAController in wan_audio_runner.py has been improved. The controller is now explicitly initialized to None and its clear() method is called conditionally in the finally block, preventing potential AttributeError if initialization fails.
• Updated Default Slice Frame: The default value for slice_frame in va_controller.py has been updated to self.prev_frame_length instead of a fixed 1, making its behavior more dynamic based on previous frame length.
• New Dependencies Added: The requirements.txt file has been updated to include zmq, jsonschema, and pymongo as new project dependencies.

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[gemini-code-assist]

Code Review

This pull request primarily addresses an import error by refactoring imports in va_controller.py to be local, which is a good approach to resolve circular dependencies. The changes also include related code cleanup in wan_audio_runner.py to handle object initialization more robustly. I've provided a couple of suggestions to improve code clarity and dependency management. Specifically, I've pointed out a redundant assignment and suggested a way to better manage optional dependencies in requirements.txt.