WEBVTT - Beep markers for sample-720p-h264-aac.mp4

NOTE Free sample WebVTT metadata track from
99helpers.com/file-types/vtt. Load it with kind="metadata":
players never show these cues; a script reads each cue's text
when it becomes active. Here every payload is one line of JSON
marking the 0.1-second beep and white square at each whole second.

beep-0
00:00:00.000 --> 00:00:00.100
{"event":"beep","second":0,"frame":0,"toneHz":1000,"square":"top-right"}

beep-1
00:00:01.000 --> 00:00:01.100
{"event":"beep","second":1,"frame":30,"toneHz":1000,"square":"top-right"}

beep-2
00:00:02.000 --> 00:00:02.100
{"event":"beep","second":2,"frame":60,"toneHz":1000,"square":"top-right"}

beep-3
00:00:03.000 --> 00:00:03.100
{"event":"beep","second":3,"frame":90,"toneHz":1000,"square":"top-right"}

beep-4
00:00:04.000 --> 00:00:04.100
{"event":"beep","second":4,"frame":120,"toneHz":1000,"square":"top-right"}

beep-5
00:00:05.000 --> 00:00:05.100
{"event":"beep","second":5,"frame":150,"toneHz":1000,"square":"top-right"}

beep-6
00:00:06.000 --> 00:00:06.100
{"event":"beep","second":6,"frame":180,"toneHz":1000,"square":"top-right"}

beep-7
00:00:07.000 --> 00:00:07.100
{"event":"beep","second":7,"frame":210,"toneHz":1000,"square":"top-right"}

beep-8
00:00:08.000 --> 00:00:08.100
{"event":"beep","second":8,"frame":240,"toneHz":1000,"square":"top-right"}

beep-9
00:00:09.000 --> 00:00:09.100
{"event":"beep","second":9,"frame":270,"toneHz":1000,"square":"top-right"}