fix: video gen chinese char

[suluyana]

Change Summary

Related issue number

Checklist

• The pull request title is a good summary of the changes - it will be used in the changelog
• Unit tests for the changes exist
• Run pre-commit install and pre-commit run --all-files before git commit, and passed lint check.
• Documentation reflects the changes where applicable

[gemini-code-assist]

Summary of Changes

Hello @suluyana, 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 addresses a potential issue with the rendering of Chinese characters during video generation. It enhances the font selection mechanism to ensure that a suitable font capable of displaying Chinese characters is identified and used, thereby improving the robustness and correctness of text rendering in generated videos.

Highlights

• Improved Chinese Character Font Handling: The get_font method in agent.py has been updated to use fc-match for more reliable font discovery and includes a check to ensure the selected font can render Chinese characters, preventing display issues.

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Changelog

• projects/singularity_cinema/create_background/agent.py
  • The get_font method was refactored to use subprocess.check_output with fc-match for finding font paths, replacing fm.findfont.
  • A validation step was added using font.getmask('中') to confirm that a candidate font can render Chinese characters before it is selected.
  • Logging statements (logger.info, logger.warning, logger.error) were introduced to provide better visibility into the font selection process and any encountered issues.
  • The error handling was improved to catch general Exception during font loading and character mask creation, with a final fallback to ImageFont.load_default() if no suitable Chinese font is found.

Activity

• The pull request was created by suluyana to fix an issue with Chinese character generation.

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[gemini-code-assist]

Code Review

The pull request effectively addresses the issue of Chinese character generation by updating the font loading mechanism. The new approach uses fc-match for font discovery and includes a crucial check for Chinese character support. However, it introduces a platform-specific dependency and uses a broad exception catch that could be more precise for better error handling and debugging.

[gemini-code-assist]

The use of fc-match introduces a strong dependency on Linux systems with the fontconfig library. This might limit the portability of the application to other operating systems like Windows or macOS where fc-match is not natively available. Consider if this platform-specific tool is universally available in all target deployment environments or if a more cross-platform font discovery method is necessary.

[gemini-code-assist]

The import subprocess statement should be moved to the top of the file with other module imports. Importing modules inside a function can lead to performance overhead as the module is re-imported every time the function is called. It also improves code readability and organization.

[gemini-code-assist]

Catching a general Exception can sometimes mask specific issues, making debugging more challenging. It's generally better to catch more specific exceptions that might be raised by subprocess.check_output (e.g., FileNotFoundError if fc-match is not found, subprocess.CalledProcessError if the command fails) or ImageFont.truetype (e.g., OSError, ValueError). This provides clearer error messages and allows for more targeted error handling if needed.

except (FileNotFoundError, subprocess.CalledProcessError, OSError, ValueError) as e:
                logger.warning(f"Font '{name}' not usable: {e}")
                continue