VTTFilter Fails to rewrite Timestamp 00:01.000 --> 00:02.000

The VTTFilter is currently unable to rewrite the timestamp 00:01.000 --> 00:02.000. This issue affects the proper handling of VTT files, particularly when attempting to fill in missing or incomplete time ranges. Please investigate and resolve this functionality gap.

Example

WEBVTT

00:01.000 --> 00:04.500

Winters come after Autumn.

00:05.000 --> 00:10.000

Often the weather goes too cold in winter.