Information for SMI, SMPTE-TT, SRT, STL, TTML - AWS Elemental Live

This is version 2.18 of the AWS Elemental Live documentation. This is the latest version. For prior versions, see the Previous Versions section of AWS Elemental Live and AWS Elemental Statmux Documentation.

Information for SMI, SMPTE-TT, SRT, STL, TTML

This section provides information specific to SMI, SMPTE-TT, SRT, STL, and TTML input captions. describes the fields that appear when you choose SCC in the Source field in the Caption Selector section of the Create New Live Event screen. For more context, see Step 1: Identify the Source Captions That You Want.

With these formats, the source captions are supplied in a captions file that is external to the video input. You must specify this file.

  • External Caption File: Specify the location of this file.

  • Time Delta: Complete this field to adjust the timestamp in the caption file. With the SCC files, the situation sometimes arises where the timestamp in the file for the first captions does not work with the video. With these types of captions, the start time for both the video/audio always 00:00:00. Assume that, in the video, the first words are spoken at 00:06:15. But in the captions file, this time is marked as 00:06:18, and every other caption is also off by 3 seconds. The solution is to adjust the times in the captions file. In this example, subtract 3 seconds from the captions file.

    Enter a value in this field to push the captions earlier or later.

    • Enter a positive number to add to the times in the caption file. For example, enter 2 to add 2 seconds to all the times in the caption file.

    • Enter a negative number to subtract from the times in the caption file. For example, enter -3 to remove 3 seconds from all the times in the caption file.