VTT Usage: Correct X-TIMESTAMP-MAP and VLC Synchronize

Abstract: This article explains how to correct VTT subtitle files with incorrect X-TIMESTAMP-MAP and VLC synchronization issues.

Created: 2024-02-06 by UserComp.com Editors

What is VTT and how is the X-TIMESTAMP-MAP used in VTT subtitle files?

WebVTT (VTT) is a format for displaying captions or subtitles for video content. It is a plain text format that contains timing information and text to be displayed. The X-TIMESTAMP-MAP is a feature used in VTT subtitle files to synchronize the subtitles with the video. This is especially useful when the video has been edited or the playback speed has been changed.

Format of the X-TIMESTAMP-MAP in VTT files

The X-TIMESTAMP-MAP is included in the first lines of the VTT file and has the following format:

WEBVTT
X-TIMESTAMP-MAP=MPEGTS:1810830,LOCAL:00:00:00.00000:35:43.618-->00:35:46.138

00:00:02.000 --> 00:00:04.500
Subtitle 1

The X-TIMESTAMP-MAP line contains the mapping between the MPEGTS (Media Playback Timestamp) and the LOCAL (wall clock) time. The timestamp map is used to convert the MPEGTS time to the LOCAL time, which is used to display the subtitles at the correct time.

How to use the X-TIMESTAMP-MAP in VTT files

To use the X-TIMESTAMP-MAP in a VTT file, the video player must support it. The player will use the mapping to convert the MPEGTS time to the LOCAL time and display the subtitles at the correct time. The X-TIMESTAMP-MAP can be generated using a tool or manually by specifying the mapping between the MPEGTS and LOCAL time.

Advantages of using the X-TIMESTAMP-MAP in VTT files

Using the X-TIMESTAMP-MAP in VTT files has several advantages:

It allows for accurate synchronization of subtitles with the video, even if the video has been edited or the playback speed has been changed.
It is supported by most modern video players.
It is a simple and easy-to-use format.

The X-TIMESTAMP-MAP is a useful feature in VTT subtitle files that allows for accurate synchronization of subtitles with the video. It is supported by most modern video players and is easy to use. By using the X-TIMESTAMP-MAP, video creators can ensure that their subtitles are accurately synchronized with the video, providing a better viewing experience for their audience.

References

This article was written using information from the following sources:

Mozilla Developer Network (MDN) - WebVTT API
W3C - WebVTT 1.0
IETF - draft-holcomb-webvtt-timestamp-map

Tags: VTT subtitle X-TIMESTAMP-MAP VLC synchronize

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