WebVTT decoder

Register name used to load filter: vttdec
This filter may be automatically loaded during graph resolution.

This filter decodes WebVTT streams into a SVG scene graph of the compositor filter.
The scene graph creation is done through JavaScript.
The filter options are used to override the JS global variables of the WebVTT renderer.
In stand-alone rendering (no associated video), the filter will use:

• Width and Height properties of input pid if any
• otherwise, osize option of compositor if set
• otherwise, txtw and txth

Options

script (str, default: $GSHARE/scripts/webvtt-renderer.js): location of WebVTT SVG JS renderer

font (str, default: SANS, updatable): font

fontSize (flt, default: 20, updatable): font size

color (str, default: white, updatable): text color

lineSpacing (flt, default: 1.0, updatable): line spacing as scaling factor to font size

txtw (uint, default: 400): default width in standalone rendering

txth (uint, default: 200): default height in standalone rendering