anchorr

Create a real-time video processing application using the 'anchorr' package, which leverages high-performance Rust-backed technology for efficient video encoding and batch processing. Your goal is to develop a mini-application that allows users to upload multiple video files, apply various filters or effects in real-time, and then save the processed videos. The application should support at least three different video effects such as grayscale conversion, slow-motion, and applying a sepia tone.

Step 1: Set up your development environment with Python and install the 'anchorr' package.
Step 2: Design a simple user interface where users can select their video files from their local machine.
Step 3: Implement functionality to process each selected video file through the chosen effect(s), utilizing the 'anchorr' package for real-time processing.
Step 4: Ensure the application provides feedback to the user on the progress of the video processing.
Step 5: Add an option for users to download the processed video files after completion.

Features:
- Support for multiple video input files.
- Real-time preview of effects before final processing.
- Ability to apply multiple effects sequentially or simultaneously.
- User-friendly interface for selecting and applying effects.
- Progress bar for tracking the processing status.
- Error handling for invalid inputs or processing failures.

Utilization of 'anchorr':
- Use 'anchorr' for the core video processing tasks, including encoding and applying visual effects. This will ensure that your application runs efficiently even when processing large video files.