Here is an example .srt snippet from wikipedia:

```
1
00:00:10,500 --> 00:00:13,000
Elephant's Dream

2
00:00:15,000 --> 00:00:18,000
At the left we can see...
```

If we take ID from the timestamp we would have `00:00:10,500 --> 00:00:13,000` and `00:00:15,000 --> 00:00:18,000`.