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shaka-project / shaka-packager

A media packaging and development framework for VOD and Live DASH and HLS applications, supporting Common Encryption for Widevine and other DRM Systems.
https://shaka-project.github.io/shaka-packager/
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Queries on: Fixed position and style formatting for EBU-TT-D subtitles #1335

Closed Brainiarc7 closed 5 months ago

Brainiarc7 commented 8 months ago

System info

Operating System: Ubuntu 22.04 Shaka Packager Version: main, git tip

Issue and steps to reproduce the problem:

This is a query on the current state of Fixed position and style formatting for EBU-TT-D subtitles in shaka-packager. As highlighted on this PR, EBU Teletext input following Level 1.5 of the core specification ETSI EN 300 706 V1.2.1 (2003-04) and webvtt in MP4 segments output are implemented. This works well, as tested.

However, fixed position and style formatting for the same aren't implemented (yet), which raises two questions:

  1. Can this be extended to match what Amazon's Medialive implementation achieves?

  2. Is such a feature within the scope of a downstream packager such as Shaka?

tobbee commented 6 months ago

I'm working on adding vertical positioning, approximative alignment (calculated from text positions to be left, center, and right) as well as text color. Should hopefully have a PR before the end of the month (March 2024).

cosmin commented 5 months ago

Closed by #1384