Accessibility/Video a11y requirements: Difference between revisions

** (structured) annotations that describe the scene and semantics

** similar to audio description, but tends to be structured along different fields

** may also be a random note left by somebody to leave a comment

** there are different types of annotations that are typically handled differently

** RDF type annotations, e.g. is not rendered as text, but available for machine processing only

** visible annotations are short pieces of text that are attached through speech/thought bubbles, or as notes  

** visible annotations require a time range, on-screen position, text styling, and annotation box styling

** visible annotations could also contain graphics, but mostly simple formatting such as for notes is required

** sequence of images that represent the original way in which the video was scripted

** if it is possible to align it with the resulting video, provides insights into the video planning and production

** if it cannot be time-aligned with the video, it should be referenced separately (text with url on webpage)

** textual description of everything that happens in the video

** basically similar to what captions and audio annotations provide together

** it is probably better to keep as much of the different types of annotations separate as possible and call the complete textual annotations available to a audio/video file its "transcript"

** if it cannot be time-aligned with the video, it should be referenced separately (text with url on webpage)

** transcripts are mostly not displayed on top of the video, but in parallel to it with the current text block selected in sync to the video

** rich formatting is possible

** wiki-style editing is often encouraged

** often there are hyperlinks in transcripts

** original description of the video for production purposes

** if it is possible to align it with the resulting video, provides insights into the video planning and production

** if it cannot be time-aligned with the video, it should be referenced separately (text with url on webpage)

** same as transcript

** for music files, a special type of transcript / subtitle format has evolved - the [http://en.wikipedia.org/wiki/Time_tag lyrics .lrc] file format

** this is also a text codec and can be time-aligned with audio / video

** same as transcript

** most videos have titles and/or credits at the start/end respectively

** where it is possible to make these available as separate text rather than burnt in (i.e. open), they should be made part of a transcript

** same as transcript

** news often have a ticker text at the bottom of the screen

** ticker text always stays at the same position and scrolls through from left to right

** the ticker text often has small ads in it, too

** there are often graphics included

** advertisers in particular want to mark regions on online video with hyperlinks and some scroll-over text, which is linked to the region

** there is the active region and there is the region for the scroll-over text

** there can be text & graphics in the scroll-over text box

** can be placed anywhere on top of the video screen

** the active region is typically empty and lights up upon scroll-over