bvibber
commented
8 years ago The notion of zones & synced canvas annotations for subtitles should perhaps be broken out separately from the 'native' subtitle & multi-language audio issue. They have overlap in use, but will need to be treated differently I think.
A few other things to consider on audio:
- A/V file may have multiple audio tracks in separate languages (for instance, a rip of a multilingual DVD) - may need to be able to select an audio track explicitly? Is this reliable enough in HTML5 video playback? (I think so but have not tested)
- could choose to ship separate audio tracks with a silent base video track (commonly done for MPEG-DASH / HLS these days) -- could hide this behind a MPEG-DASH/HLS manifest file, or explicitly list the files (could require direct use of MSE by the player, which will not work on iOS Safari, whereas using HLS would work)
jronallo
Description
Internationalization: Audio streams in welsh / english, along with subtitles in Welsh/English.
Proposed Solutions
Embedded textual content handled via JSON-LD. Options: (1) Single annotation with a Choice of different resource, by language, as the body. (2) Layer per-language with annotations with a single body. (3) Refer to subtitles resource in existing format as the body of an annotation (4) ?? expose existing srt/vtt files and burned-in captions in info.json? (or TTML [https://www.w3.org/TR/ttaf1-dfxp/] )
For situations when there are more than one video associated with a canvas, it might be useful to associate the subtitles (etc) with the canvas as individual annotations.
For situations when there is a single media stream, it would be easier to use existing subtitle resources and have the player render them. → Reference from info.json to different language subtitle files (outside of presentation API) Subtitles that should be rendered by the viewing application in a separate window/panel should be annotations on the canvas rather than a subtitle file. Transcription (with speaker identification) != captioning SRT “spec” http://srt-subtitles.com/ & https://en.wikipedia.org/wiki/SubRip - very simple entries: entry number, time range, text (with limited HTML)
Use case for zones: associate timestamps of subtitles with the zone, and then associate zone with the time frame of multiple canvases. Can associate annotations with the canvas. Link from video-info.json to a zone.
Additional Background
Source: BL workshop notes Interest: 100%