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/puddle-jumping-parade.srt

@@ -0,0 +1,83 @@
+1
+00:00:06,760 --> 00:00:08,680
+One, two! Ready, go!
+
+2
+00:00:08,680 --> 00:00:12,300
+Put on my yellow boots and grab my red umbrella too
+
+3
+00:00:12,300 --> 00:00:16,079
+The rain has stopped and left the sky a shiny, happy blue!
+
+4
+00:00:16,079 --> 00:00:20,079
+A giant puddle in the street is looking back at me
+
+5
+00:00:20,079 --> 00:00:23,859
+I take a giant running leap—one, two, and three!
+
+6
+00:00:23,859 --> 00:00:27,660
+Splash! Goes the water, jumping to the sky
+
+7
+00:00:27,660 --> 00:00:32,140
+Even little sparrows stop to watch us marching by!
+
+8
+00:00:32,659 --> 00:00:36,200
+Hooray, hooray! Join the happy parade!
+
+9
+00:00:36,200 --> 00:00:40,159
+Dancing in the sunshine that the morning made!
+
+10
+00:00:40,159 --> 00:00:43,859
+Clap your hands together, stomp your little feet
+
+11
+00:00:44,439 --> 00:00:49,299
+Every single puddle makes the melody complete!
+
+12
+00:00:49,299 --> 00:00:54,099
+La-la-la, step in time, smiling ear to ear!
+
+13
+00:00:56,420 --> 00:01:00,100
+A snail upon the garden wall is waving with its horn
+
+14
+00:01:00,100 --> 00:01:03,899
+The brightest, biggest rainbow in the neighborhood is born!
+
+15
+00:01:03,899 --> 00:01:07,719
+We'll share a pocketful of sweets and sing a silly tune
+
+16
+00:01:07,719 --> 00:01:11,439
+And march around the playground till we reach the afternoon!
+
+17
+00:01:13,060 --> 00:01:16,239
+Hooray, hooray! Join the happy parade!
+
+18
+00:01:16,239 --> 00:01:20,120
+Dancing in the sunshine that the morning made!
+
+19
+00:01:20,120 --> 00:01:23,900
+Clap your hands together, stomp your little feet
+
+20
+00:01:23,900 --> 00:01:29,200
+Every single puddle makes the melody complete!
+
+21
+00:01:29,200 --> 00:01:31,280
+Jump! Splash! Hooray!