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Bug 20847 - WebVTT: Ignoring direction of the cue text when positioning the cue
Summary: WebVTT: Ignoring direction of the cue text when positioning the cue
Alias: None
Product: TextTracks CG
Classification: Unclassified
Component: WebVTT (show other bugs)
Version: unspecified
Hardware: All All
: P2 normal
Target Milestone: ---
Assignee: Silvia Pfeiffer
QA Contact: This bug has no owner yet - up for the taking
Depends on:
Reported: 2013-02-01 15:09 UTC by vcarbune
Modified: 2013-07-08 03:32 UTC (History)
4 users (show)

See Also:


Description vcarbune 2013-02-01 15:09:13 UTC
According to the third step of the rendering rules, the direction parameter is determined based on the cue text contents by applying the Unicode Bidirectional Algorithm.

Depending on the text direction, the cue is positioned differently within the video element with the same cue settings.

An use case of not changing the final positioned cue with respect to the determined language are translated captions.

For example, if the cue was positioned in a specific part of the video as to not occlude visual elements of the video, this would allow the translated caption to preserve this property if the final position is not changed.

Adding a setting that would override the default language dependent behavior would allow caption translators and automatic services to have no knowledge about the different positioning schemes of the cue (and not require to reverse engineer the original position).
Comment 1 Silvia Pfeiffer 2013-07-08 03:32:59 UTC
The introduction of regions now provides an ability to fix the positioning of cues independent of their directionality.

If that is not sufficient to satisfy your use case, please re-open this bug.