Read the advertising out of an episode's words

A second ad detector, and it finds a class the first structurally cannot.

The audio scan compares episodes mirrored within a minute of each other, so
what it finds is advertising a CDN stitched into all of them -- validated
against the declared-versus-served length gap. A show that inserts nothing has
no gap, which by that measure means it carries no advertising, and the host-read
sponsor block in the middle of it is invisible. Every published transcript the
server can use belongs to exactly such a show, because having no inserted
advertising is the condition for using one. The two detectors do not merely fail
differently; they look at disjoint sets of episodes.

**Density, not phrases.** One marker is a mention. Measured against the 38
transcripts harvested from the live library: a single "brought to you by" is a
one-second tag inside play-by-play and skipping it would cut the game, and a
guest describing how a sponsor came forward for his yacht event says "sponsor"
four times while being the programme -- the same trap the toc=false chapter rule
already documents. A real read stacks different *kinds* of marker inside a few
seconds: who it is for, where to go, what the offer is, what the terms are. Two
kinds and fifteen seconds, the same ad unit the length-gap rule uses.

Every threshold comes from a measurement rather than a guess. The 25-second
bridge is the 17.7-second gap between "presented by Delta" and "12% off" in the
Seahawks Rewind read, with the product description in between. "Slash" needs a
domain in front of it because the corpus contains "a children's movie slash book
for adults".

Across all 38 live transcripts it reports **one** candidate: that Delta block,
41:07 to 41:33, with no programme clipped at either end. That is low recall by
design -- these are the shows with the least advertising, because they are the
only ones whose transcripts can be used at all. The shows with real ad breaks
need speech recognition, which is not built.

**Nothing is published as a skip.** The candidates are stored with the words and
the lines are dimmed on the transcript screen, so the reader can see what the
server thinks is an advertisement and disagree with it. Dimmed rather than
hidden, because a wrong call has to stay visible. Nothing in the playback path
reads them -- same posture as the signature library's shadow run, and the same
reason: a detector acting on its own unchecked first guesses makes skips into
the middle of the programme, which is worse than no skips.

Schema 18 adds the mark to the cue, defaulting to not: a line nobody judged is
not an advertisement. Migrated and checked on a device.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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