YouTube caps tokenless stream URLs at exactly their leading 1 MiB:
plain, open-ended, and oversized requests get 403, and fresh URLs
refuse offset starts, so playback died mid-first-minute. PO tokens
would lift the cap but the token-capable Innertube clients need
signature deciphering that is broken in rustypipe upstream (botguard
was built and tested — ineffective through the iOS client).
The player now streams every http(s) source through a windowed
SourceStream (bounded ~1 MiB ranges, 200-body fallback, eager
seek/reconnect so rejected windows fail typed instead of retrying
forever) and the capture downloader windows the same way. Stream URLs
come from a minimal yt-dlp sidecar again — metadata stays on the
pure-Rust rustypipe extractor — whose cipher-solved URLs stream whole
files at a throttled ~32 KB/s; a missing binary degrades to 1 MiB
streams with a warning. botguard_bin is wired through so streams flip
back to pure Rust when upstream deciphering recovers. Live-verified on
the exact track from the failure log.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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