WEIFENG2333/VideoCaptioner ? reverse-engineered prompt

Build me a Python app called VideoCaptioner that helps people make subtitles for videos from start to finish.

I want a simple desktop app and a command line tool that can take a video file, turn speech into subtitles, clean up the sentence breaks, translate the subtitles into another language, and burn them into the video if needed. It should also let me download online videos from places like YouTube and Bilibili, then run the same subtitle workflow on them. Please make the free transcription and translation options work right away without needing any setup, and add support for using an LLM API when I want better subtitle polishing and translation quality.

Make the experience easy for non experts, with clear settings, a way to view and change configuration, and sensible defaults. If you need to check current docs for any libraries or API details, look them up online.