← All guides

Fixing "Sign in to confirm you're not a bot" in yt-dlp & automated pipelines

Written by the VidWords Team · · Updated · Report a correction

If your yt-dlp script or video pipeline throws ERROR: [youtube] ...: Sign in to confirm you're not a bot. This helps protect our community, here is why YouTube triggered the bot challenge and the solutions that work reliably.

Why does YouTube show the bot challenge?

In 2024–2026, YouTube rolled out stricter anti-scraping systems, including Proof of Origin (PoToken) and BotGuard challenges. When requests originate from known cloud provider IP addresses (AWS EC2, DigitalOcean, Hetzner, Google Cloud, Linode) without valid browser session tokens, YouTube refuses video streaming and caption endpoints with the bot challenge.

The 4 fixes ranked by durability

  1. Use a dedicated hosted transcript API: If your workflow only needs transcripts and subtitles, an API like VidWords moves the proxy rotation, the retry logic and the cookie rot off your machine and onto someone whose job it is. It does not make the bot wall disappear — nothing does — but a hosted service re-routes and falls back to transcribing the audio when a caption fetch is blocked, which is the part that is tedious to build and maintain yourself.
  2. Route through residential proxies: --proxy "http://user:pass@host:port" gets you off the datacenter ranges, which is what triggered the challenge. Note that the proxy alone does not supply a PO token — for that you also need a token provider plugin (bgutil-ytdlp-pot-provider or equivalent) wired in via --extractor-args; a proxy on its own still hits the wall on the formats that require one.
  3. Extract and pass session cookies (Temporary fix): Using --cookies cookies.txt from an active Google session works temporarily, but cookies expire and risk getting your personal account flagged if used in high-volume automation.
  4. Update yt-dlp to the nightly build: The yt-dlp team regularly patches extractor changes. Run yt-dlp -U or pip install --upgrade --force-reinstall "yt-dlp[default]".

Why extracting only captions with an API is cleaner

To be fair to yt-dlp: you do not have to download the video to get the captions — yt-dlp --skip-download --write-auto-subs --sub-format vtt URL fetches the subtitle track alone. The cost is not bandwidth, it is maintenance. The caption endpoints sit behind the same bot checks as the streams, so the failure recurs on every extractor change, and you own the proxy pool, the token provider and the retry ladder forever.

That is the trade a hosted service makes for you. VidWords' REST API and MCP server return official and auto-generated transcripts through maintained proxy infrastructure, and fall back to transcribing the audio when a video has no usable caption track at all. Videos still fail — a caption fetch that YouTube blocks is a real outcome, not a marketing edge case — but the fallback ladder and the infrastructure behind it are not yours to keep running.