post: generating subtitles for songs that ship without timestamps

Tutorial on turning untimed AI-generated audio into LRC + SRT: align ASR word
timestamps against the KNOWN lyrics (SequenceMatcher) instead of trusting a
transcript, then a governor that rejects impossible anchors, refills runs by
unit-proportional duration, and enforces a 1.2 s minimum line gap.

Ships 18 English songs (342 subtitle lines, mean anchor coverage 0.96, 9/18
fully anchored) with synced lyrics plus downloadable .srt per track. Documents
both player bugs and the headless-Chrome numeric probe that finally caught them.

public/subs/willow-by-the-silver-stream.srt

@@ -0,0 +1,75 @@
+1
+00:00:23,828 --> 00:00:26,699
+Mmm-mmm, ahh-ahh...
+
+2
+00:00:26,699 --> 00:00:32,859
+Silver runs the quiet stream beneath the willow tree
+
+3
+00:00:33,640 --> 00:00:39,700
+Golden is the evening star shining down on me
+
+4
+00:00:40,540 --> 00:00:46,359
+All the little meadow flowers fold their petals tight
+
+5
+00:00:46,359 --> 00:00:53,020
+Waiting for the moon to weave a blanket of the night
+
+6
+00:00:53,020 --> 00:00:59,759
+May the wind be gentle on your weary wings
+
+7
+00:00:59,759 --> 00:01:06,280
+May you hear the lullaby the river softly sings
+
+8
+00:01:06,280 --> 00:01:13,519
+Close your eyes and drift away where the shadows gleam
+
+9
+00:01:13,519 --> 00:01:21,120
+Peace will walk beside you in the valley of a dream
+
+10
+00:01:27,319 --> 00:01:31,439
+Fireflies are dancing slow among the reeds and moss
+
+11
+00:01:33,140 --> 00:01:39,459
+Showing every wandering heart the stepping stones to cross
+
+12
+00:01:39,459 --> 00:01:46,659
+Nothing in the dark can harm the light inside your chest
+
+13
+00:01:46,659 --> 00:01:53,620
+Lay your head upon the grass and let the world rest
+
+14
+00:01:53,620 --> 00:01:59,760
+May the wind be gentle on your weary wings
+
+15
+00:01:59,760 --> 00:02:06,299
+May you hear the lullaby the river softly sings
+
+16
+00:02:06,299 --> 00:02:13,419
+Close your eyes and drift away where the shadows gleam
+
+17
+00:02:13,419 --> 00:02:21,259
+Peace will walk beside you in the valley of a dream
+
+18
+00:02:50,859 --> 00:02:54,719
+In the valley of a dream...
+
+19
+00:02:56,539 --> 00:03:00,680
+Sleep in peace tonight.