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For videos without subtitles one could chain Whisper to auto-generate transcripts, though that would require downloading the audio and processing it

This is exactly what I’ve built. Nothing fancy just ytdlp + whisper + ripgrep + fzf and I’ve got a pretty interesting way to ctrl+f my YT history.

Mind to share? I'd like to try this out

Not OP, but I too wrote something nearly identical with whisper so I could creep on old EthosLab videos. Here's the gist:

from pytube import Channel

import whisper

channel_yt = Channel(channel_url)

video_yt = channel_yt.videos[0]

video_yt_stream = video_yt.streams.filter(mime_type="video/mp4").filter(res="720p").first()

video_yt_video_file_path = video_yt_stream.download()

audio = whisper.load_audio(video_yt_video_file_path)

model = whisper.load_model("tiny")

transcript = model.transcribe(audio)