I used it like sibling commenter to get subtitles for downloaded videos. My hearing is bad. Whisper seems much better that YouTube's built-in auto-subtitles, so sometimes it is worth the extra trouble for me to download a video just to generate good subtitles and then watch it offline.

I also used whisper.cpp to transcribe all my hoarded podcast episodes. Took days of my poor old CPU working at 100% on all cores (and then a few shorter runs to transcribe new episodes I have downloaded since). Worked as good as I could possibly hope. Of course it gets the spelling of names wrong, but I don't expect anything (or anyone) to do much better. It is great to be able to run ripgrep to find old episodes on some topic and sometimes now I read an episode instead of listen, or listen to it with mpv with subtitles.

This, but I want a summary about the 3 hour video first before getting spending the time on it.

Download -> generate subtitles -> feed to AI for summary works pretty well

You'll probably like Whisper Live and it's browser extensions: https://github.com/collabora/WhisperLive?tab=readme-ov-file#...

Start playing a YouTube video in the browser, select "start capture" in the extension, and it starts writing subtitles in white text on a black background below the video. When you stop capturing you can download the subtitles as a standard .srt file.