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fix(stream): enable captions only for real Korean tracks, skip auto-generated

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The broadcast subtitle rule treated any ko* track as Korean, so YouTube's
auto-generated (자동 생성) Korean track would switch captions on. Match only
human-authored tracks (kind !== 'asr', vss_id not 'a.*') and pass the full
track object to setOption so YouTube selects the manual track rather than the
same-languageCode ASR one. Captions stay off when only an auto track exists.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
javis-bot
2026-06-11 18:41:25 +09:00
parent 835459111e
commit 3e333763fb
2 changed files with 25 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
bot/scripts/stream-test/README.md
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@@ -29,7 +29,8 @@ real browsing session captured from the X display.
ad" instantly, closes overlay ads, fast-forwards unskippable ads (seek-to-end
+ 16x + mute) and RESTORES the pre-ad muted/playbackRate when the ad ends; and
(2) applies the subtitle rule per video: captions OFF by default, Korean ON
when the video offers a Korean track. Run it alongside the broadcast; it
only when the video offers a real (human-authored) Korean track; YouTube's
auto-generated Korean track is ignored. Run it alongside the broadcast; it
reconnects across Chrome restarts.
## Run

32
bot/scripts/stream-test/broadcast-helper.mjs
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@@ -5,7 +5,9 @@
// so they clear in ~1s. The pre-ad muted/playbackRate are SAVED and
// RESTORED when the ad ends, so the main video is never left muted/fast.
// 2. Applies the subtitle rule per video: captions OFF by default, but a
// Korean track is turned ON when the video offers one. Runs once per video.
// real (human-authored) Korean track is turned ON when the video offers
// one. YouTube's auto-generated (자동 생성) Korean track does NOT count and
// is left off. Runs once per video.
// Self-contained: no extension, no network/hosts changes. Reconnects across
// Chrome restarts.
//
@@ -44,29 +46,41 @@ const WATCH = `(() => {
return adShowing;
};
// A "real" Korean caption track is a human-authored/uploaded Korean track,
// NOT YouTube's auto-speech-recognition (자동 생성) track. ASR tracks report
// kind === 'asr' and a vss_id like 'a.ko'; manual tracks have an empty kind
// and a vss_id like '.ko'. We only ever turn captions on for a real track.
const isRealKo = (t) => !!t && /^ko/i.test(t.languageCode || '')
&& t.kind !== 'asr' && !/^a\./.test(t.vss_id || '');
const capTick = (adShowing) => {
if (adShowing) return; // don't touch captions while an ad plays
const p = document.getElementById('movie_player');
if (!p || !p.getOption || !p.getVideoData) return;
const vid = p.getVideoData().video_id;
if (!vid) return;
// Decide the desired state once per video (off, or Korean if offered).
// Decide the desired state once per video: ON only if a real (non-ASR)
// Korean track is offered, otherwise OFF.
if (capWant[vid] === undefined) {
capTries[vid] = (capTries[vid] || 0) + 1;
let tracks = [];
try { p.loadModule('captions'); tracks = p.getOption('captions', 'tracklist') || []; } catch {}
if (tracks.length) capWant[vid] = tracks.find((t) => /^ko/i.test(t.languageCode || '')) ? 'ko' : 'off';
if (tracks.length) capWant[vid] = tracks.some(isRealKo) ? 'ko' : 'off';
else if (capTries[vid] > 16) capWant[vid] = 'off'; // no tracks: keep it off
else return; // tracklist not ready yet
}
// Enforce it every tick so YouTube cannot silently re-enable captions.
let curLc = '';
try { const c = p.getOption('captions', 'track'); curLc = (c && c.languageCode) || ''; } catch {}
// Enforce it every tick so YouTube cannot silently re-enable captions or
// swap our manual Korean track for the auto-generated one.
let curTrack = null;
try { curTrack = p.getOption('captions', 'track'); } catch {}
const curLc = (curTrack && curTrack.languageCode) || '';
if (capWant[vid] === 'ko') {
if (!/^ko/i.test(curLc)) {
if (!isRealKo(curTrack)) { // not on the real Korean track (off, or ASR) -> set it
let tracks = []; try { tracks = p.getOption('captions', 'tracklist') || []; } catch {}
const ko = tracks.find((t) => /^ko/i.test(t.languageCode || ''));
if (ko) { try { p.setOption('captions', 'track', { languageCode: ko.languageCode }); } catch {} }
const ko = tracks.find(isRealKo);
// Pass the full track object so YouTube selects this exact manual track
// and not the same-languageCode auto-generated one.
if (ko) { try { p.setOption('captions', 'track', ko); } catch {} }
}
} else if (curLc) { // want off but a track is on -> turn it off
try { p.setOption('captions', 'track', {}); } catch {}