feat: Support multiple subtitles per segment and extend TTS voices

[xiaoxianhjy]

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 @xiaoxianhjy, 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 introduces significant enhancements to the video generation process by enabling the display of multiple, chunked subtitles within a single video segment, thereby resolving issues with excessively long text. Concurrently, it greatly expands the available Text-to-Speech voice options, offering a richer selection of Chinese and English voices for content creation. These updates improve both the visual presentation and auditory diversity of generated videos.

Highlights

• Multiple Subtitles per Segment: Implemented functionality to split long text into multiple subtitle images for a single video segment, preventing text overflow and improving readability. This involves a new text chunking algorithm and updated video composition logic.
• Extended TTS Voice Support: Added a wide array of new Text-to-Speech voices to the configuration, including various Chinese Mandarin, Chinese Dialect, and English options, significantly enhancing voice diversity for generated content.
• Roadmap Progress: Updated the project roadmap to mark the completion of "default support for more TTS voices" and "support multiple subtitle switching in one segment to prevent excessively long text".

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[gemini-code-assist]

Code Review

This pull request introduces support for multiple subtitles per segment and extends the available TTS voices. The changes for adding more voices are straightforward configuration updates. The implementation for multiple subtitles involves a new, complex text-splitting function and modifications to the video composition logic. While the features are valuable, I've identified opportunities to improve code robustness, maintainability, and clarity. My review includes suggestions to fix a potential bug in text splitting, simplify complex code, and make file handling more resilient to errors.