Add Live Caption to MPV

[nendonerd]

Hi I'm an iina user and always wish it could have live caption feature like the ones in chrome. I just read about the documentation of apple's new speech-to-text api in macOS 26. Done some testing and found out it's quite good. I want to write a custom audio filter to access the decoded raw PCM live audio data in mpv, pass it to this transcribe api, then use the transcription it produced to live update the subtitles. The PR is going to be os specific and I'm afraid it might get rejected. So I'm asking for your clarification about whether it could be rejected or not.

[Akemi]

so it doesn't look like you were being ignored. i assume you are the same person as the one we talked to on irc today and your questions have been answered.

[ahaoboy]

I remember FFmpeg added Whisper; I wonder if this functionality can be achieved using a script?

[kasper93]

You mean https://github.com/GhostNaN/whisper-subs ?

[ahaoboy]

Interesting. Although it seems to only support Linux, I might be able to improve it.