Muting was implemented three times and agreed nowhere. A YouTube item is a
cross-origin iframe, so `el.muted` reaches nothing; only the IFrame API can
touch it. Both browser-family players got this wrong, in opposite directions:
web playerVars.mute was `userHasInteracted ? 0 : 1` — autoplay policy and
NOTHING else. An item an operator muted in the admin console played
WITH SOUND, a wall follower blared alongside its leader, and the
real-time device:mute-changed toggle only ever touched `<video>`.
onReady then unmuted unconditionally, and the click-to-unmute overlay
appeared on deliberately-muted items and undid the operator's setting.
tizen the embed URL hardcoded `mute=1`, so YouTube there was PERMANENTLY
silent: the per-item flag was never read and nothing could unmute it.
device:mute-changed did nothing at all, because it dereferenced a
<video> that is null for a YouTube item.
Android was already correct and is unchanged — it is the reference here.
The rule now lives once, in server/lib/media-mute.js, served to the web player
from its single source the same way schedule-eval.js is, and mirrored in Tizen
(which ships inside the .wgt and cannot import it). The ORDER is the substance:
a wall follower is always silent (one wall, one audio source) > autoplay policy,
which is a hard constraint rather than a preference because unmuted playback
without a gesture is refused outright and costs the VIDEO > a live operator
toggle, who is looking at the screen > the item's stored flag.
shouldOfferUnmute() exists so the prompt only appears when a gesture is the ONLY
thing in the way. Prompting on a muted item trains viewers to click a button
that undoes an operator's decision.
Tizen gains enablejsapi + a postMessage bridge so a live toggle flips the embed
without reloading it — reloading would restart the video from zero every time
someone touched the control.
11 new tests pinning each precedence step separately; 1055 pass.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uaeo9MvzKoyXuN6ZsbhtkL
