Failure isolation and missing plugins

Yrendr treats third-party processing as fault-prone and isolates common failures at package, processor and timeline-application boundaries.

Failure behavior

• Package import or registration errors mark the package as failed and are recorded in Debug Log.
• Video/audio processor exceptions skip that processor call and are recorded.
• Generator exceptions produce no generated frame for that call and are recorded.
• Invalid video/audio output shape is rejected.
• Timeline processor exceptions fail the processor run before changes are applied.
• Invalid timeline actions trigger rollback to the pre-run project state.

Develop for clear failure

1. Validate plugin-specific input before expensive processing.
2. Raise concise exceptions for user-correctable problems.
3. Preserve expected frame/sample shapes.
4. Avoid partial external side effects that cannot be rolled back by the host.
5. Test missing-media and missing-selection cases explicitly.

Note: Failure isolation is not a substitute for validation. A plugin should still reject invalid input deliberately and explain what the user can change.