Support for resumable processing #1458
Description
Hi, thank you for your continued development and maintenance of video2x! During actual usage, I encountered situations where processing large files was interrupted unexpectedly (e.g., power outages, program errors), which forced me to restart the entire task from scratch. It would be very helpful to support resumable processing:
- Save progress information during video processing.
- When a conversion task is interrupted, allow resuming from the last saved checkpoint instead of starting over.
- Handle various interruption scenarios (manual stop, crash, etc.) to make restarting easier.