Time-aligned Text and video accessibility

Reviewed Silvia's workplan for video accessibility (Mozilla)

Short term goals

• we need example files for:
  • picture-in-picture (signing)
  • multiple languages (audio)
  • multiple languages (text)
• Specify ways of rendering each of these
• Come up with a requirements doc for rendering methods (might be best to just specify as HTML)
• Implementations of OggText?, OggSRT?

Long term goals

• Implementations of <itext> (finish specification)
• Specification of TDHT, OggTDHT?
• specification for content selection and adaptation