Subtitles

This document is part of eXtensible Binary Universal Protocol project documentation. It contains description of format for storing subtitles and karaoke.

This format should provide way how to store text and probably other types of visual data as for presentation or multimedia running in time.

One of the direct use of text blocks is a format for storing subtitle data for audio and video files. In this area there are many applicable alternatives. For this format XBTS suffix is introduced.

The simplest variant is to declare text only and time range for how long to display it, or you can use a suitable algorithm for generating text display time. This doesn't include any support for text location or effects.

Format for textual subtitles

• Sequence of times and text strings
  
  • Time Mark
    
    • String
    • …
  • Time Mark
    
    • String
      

For the basic variant of the subtitle this might be one possible extension, which primarily provides additional meta information.

• Definition of the text meaning - This extension should allow to distinguish between spoken words and for example background sounds or scripts and so on.
• Identify the person speaking - This extension include person identification for spoken sentences.

The following variant allows for basic text captions to define the font, font color, text placement or algorithms for positioning of the image or text.

The following extension allows to accurately place the optional text into view, as well as other objects.

This format allows the use of the following formats:

• Picture - Picture inserted into frame
• Picture Animation - Possible to change coordinates in time and to use various transformations
• Font - It is possible to use attached fonts

Concrete realization of the test format is XBTS. Defines the permitted ranges of blocks, available compression methods and supported functionality.