Feature Request: Subscribe to Loading State and Sink Empty State

[joe223]

Motivation

Currently, when building media players with Mediabunny, developers need to implement custom loading state detection by monitoring frame updates manually. This leads to:

1. Inconsistent implementations across different applications
2. Performance overhead from polling or manual state tracking
3. Lack of standardization for loading state detection
4. Difficulty in providing smooth UX during buffering or when sinks are empty

[Vanilagy]

Great point! This is planned for new API in v2 (or slightly after v2).