Techniques/General/Caption Updates: Difference between revisions

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==Technique Status Category==
==Technique Status Category==


[[Category:Techniques Proposed]]
[[Category:Techniques Ready For Review]]


== Status ==
== Status ==


<blockquote>Include links to discussions, previous drafts, surveys, meeting minutes, or production status as appropriate. Add status updates to the bullet list to help with an at-a-glance audit trail.</blockquote>
* Proposed updates to techniques.
 
* [http://www.w3.org/2014/08/19-wai-wcag-irc#T16-02-54 Action item] for updating Caption related techniques
* New technique.
* [http://www.w3.org/2014/08/19-wai-wcag-minutes.html#item03 Meeting minutes] for reference
* @@ Link to WBS when surveyed by group
* @@ Notes on work still needed before the technique is ready to publish, such as user agent support notes, etc.


== Applicability ==
== Applicability ==


<blockquote>Include information on when it is technically appropriate to use the technique.</blockquote>


{Technology} content with {relevant feature}.
Synchronized multimedia with captions.


== WCAG references ==
== WCAG references ==


<blockquote>Include a list of success criteria, conformance requirements or guidelines to which this technique relates. For each one, provide:
* [http://www.w3.org/TR/WCAG20-TECHS/G87 G87: Providing closed captions] (sufficient)
* [http://www.w3.org/TR/WCAG20-TECHS/G93 G93: Providing open (always visible) captions] (sufficient)
* [http://www.w3.org/TR/WCAG20-TECHS/G9 G9: Creating captions for live synchronized media] (sufficient)
* [http://www.w3.org/TR/WCAG20-TECHS/F8 F8: Failure of Success Criterion 1.2.2 due to captions omitting some dialogue or important sound effects] (failure)
* [http://www.w3.org/TR/WCAG20-TECHS/SM11 SM11: Providing captions through synchronized text streams in SMIL 1.0] (sufficient)
* [http://www.w3.org/TR/WCAG20-TECHS/SM12 SM12: Providing captions through synchronized text streams in SMIL 2.0]  (sufficient)
* [http://www.w3.org/TR/WCAG20-TECHS/FLASH9 FLASH9: Applying captions to prerecorded synchronized media] (sufficient)


* the ID or anchor for that item;
* the number of the item;
* the short name for the item;
* whether the technique is sufficient, advisory, or a failure of the item.


It is not necessary to provide a live link to the guidelines, but if you do, double-check that the link points to the correct place. It is also not necessary to provide redundant links to the Understanding and How to Meet documents; those are done automatically by the generator later in the process. The suggested format for these references is in the sample item below.</blockquote>
* [http://www.w3.org/TR/UNDERSTANDING-WCAG20/media-equiv-captions.html SC 1.2.2 Captions (Prerecorded)] (Level A)
 
* [http://www.w3.org/TR/UNDERSTANDING-WCAG20/media-equiv-real-time-captions.html 1.2.4 Captions (Live)] (Level AA)
* text-equiv-all: [http://www.w3.org/TR/WCAG20/#text-equiv-all SC 1.1.1 Non-text Content] (sufficient)


== User Agent and Assistive Technology Support Notes ==
== User Agent and Assistive Technology Support Notes ==
<blockquote>Provide notes regarding known lack of support for this technique with particular user agents or assistive technologies.</blockquote>


== Description ==
== Description ==
<blockquote>Main text of the technique. Techniques begin with "The objective of this technique is to..." and describe what the user should accomplish, then move on to how. Some techniques are best explained through examples, but an overview of the approach should still be provided in the description.</blockquote>
The objective of this technique is to...


== Examples ==
== Examples ==


<blockquote>Examples for the technique, or links to external examples. Provide a description of the example, and source code if applicable. Explanatory content can be intermixed with code samples.
== Resources ==


If you are providing multiple examples, there are two approaches:
== Related Techniques ==


* Simple examples can just be provided in a bulleted list.
@@ Propose adding F8 as a Related Technique to [http://www.w3.org/TR/WCAG20-TECHS/G87 G87: Providing closed captions] and [http://www.w3.org/TR/WCAG20-TECHS/G93 G93: Providing open (always visible) captions]
* More elaborate examples should have sub-headers for each example. Provide a descriptive title for the header but do not number them, this is done later in the process. Use the samples in this template for each example.
* [http://www.w3.org/TR/WCAG20-TECHS/F8 F8: Failure of Success Criterion 1.2.2 due to captions omitting some dialogue or important sound effects] (failure)


You can include links to working examples or upload examples (see "upload file" link under tools navbar) to the wiki as needed.
== Tests ==
</blockquote>
 
Description of example.
 
Code sample. Be sure to put a space at the beginning of each line, and manually wrap
lines so they don't push out to the right.
This technique is shown in operation in the [http://example.com/ working example of {technique or example title}]. The [http://example.com/ source code of {technique or example title}] is also available.


== Resources ==
@@ Propose updating the final step in the Test Procedure for G87 and G93 as follows below.  Earlier steps are not changed, but are provided for context.  Bruce thinks that this phrasing approach means that the quality expectations between live and prerecorded media don't need to be called out.


<blockquote>Provide a list of links to external resources, if any.</blockquote>
=== G87 Procedure ===


* [http://www.w3.org/WAI/GL/ WCAG Working Group]
# Turn on the closed caption feature of the media player
# View the synchronized media content
# Check that captions are visible and verify that:
#* Captions are synchronized with the audio
#* Dialogue and important sounds are accurately captioned
#* Where possible, captions do not obscure or obstruct relevant information in the video, including faces


=== Related Techniques ===
=== G93 Procedure ===


<blockquote>Provide a list of related techniques. For techniques that are part of the published suite, a technique id (ex. H30) is sufficient. For techniques that exist only in the wiki, link to the wiki page.</blockquote>
# Watch the synchronized media with closed captioning turned off.
# Check that captions are visible and verify that:
#* Captions are synchronized with the audio
#* Dialogue and important sounds are accurately captioned
#* Where possible, captions do not obscure or obstruct relevant information in the video, including faces


* [http://www.w3.org/TR/WCAG20-TECHS/H30 H30]


== Tests ==
@@ SM11, SM12, and FLASH9 are all technology-specific techniques for displaying closed captions.


<blockquote>Describe how to test reliably that the technique has been applied, or that it has not been applied. If there is more than one type of test procedure, copy the entire section including the "Tests" header, and provide information about the type of test in this space before the "Procedure" header.</blockquote>
Marc 19 Aug:  While testing for caption accuracy probably shouldn't apply to these techniques, I think it's applicable to test that the technique will not obscure important information.


=== Procedure ===
Bruce 2 Sept:  Agree we can assume good quality.  Note that Flash9 already had step for checking quality, so this helps with consistency among the three.  Do we need them even more consistent?


<blockquote>If there are any prerequisite tests, list passing them as a required first step in the procedure. Provide an ordered list of steps, with at least one step to check for a particular condition.</blockquote>
Propose updating the final step in the Test Procedure for SM11, SM12, and FLASH9 with the following:


# step 1
=== SM11 and SM12 Procedure ===
# step 2
# check that xyz


=== Expected Results ===
# Enabled caption preference in player, if present
# Play file with captions
# Check that captions are displayed and verify that:
#* Captions are synchronized with the audio
#* Captions do not obscure or obstruct relevant information in the video, including faces


<blockquote>Indicate which step(s) from the test procedure must evaluate to true. For failure techniques, use wording like "If check #2 is false, then this failure condition applies and the content fails this success criterion."</blockquote>
=== FLASH9 Procedure ===


* #3 is true
Watch all video content displayed by your Flash movie. Ensure that:
# Captions are available for all audio content, either turned on by default or as a user preference.
# Captions are synchronized with the audio and do not obscure or obstruct relevant information in the video, including faces


== Test Files ==
== Test Files ==
<blockquote>Provide test files here. Currently, techniques do not reference test files, but we may do something with them in the future. Note that working examples (including source code) do not go here, they should be referenced in the examples section.</blockquote>

Latest revision as of 13:57, 2 September 2014

Technique Category

Technique Status Category

Status

Applicability

Synchronized multimedia with captions.

WCAG references


User Agent and Assistive Technology Support Notes

Description

Examples

Resources

Related Techniques

@@ Propose adding F8 as a Related Technique to G87: Providing closed captions and G93: Providing open (always visible) captions

Tests

@@ Propose updating the final step in the Test Procedure for G87 and G93 as follows below. Earlier steps are not changed, but are provided for context. Bruce thinks that this phrasing approach means that the quality expectations between live and prerecorded media don't need to be called out.

G87 Procedure

  1. Turn on the closed caption feature of the media player
  2. View the synchronized media content
  3. Check that captions are visible and verify that:
    • Captions are synchronized with the audio
    • Dialogue and important sounds are accurately captioned
    • Where possible, captions do not obscure or obstruct relevant information in the video, including faces

G93 Procedure

  1. Watch the synchronized media with closed captioning turned off.
  2. Check that captions are visible and verify that:
    • Captions are synchronized with the audio
    • Dialogue and important sounds are accurately captioned
    • Where possible, captions do not obscure or obstruct relevant information in the video, including faces


@@ SM11, SM12, and FLASH9 are all technology-specific techniques for displaying closed captions.

Marc 19 Aug: While testing for caption accuracy probably shouldn't apply to these techniques, I think it's applicable to test that the technique will not obscure important information.

Bruce 2 Sept: Agree we can assume good quality. Note that Flash9 already had step for checking quality, so this helps with consistency among the three. Do we need them even more consistent?

Propose updating the final step in the Test Procedure for SM11, SM12, and FLASH9 with the following:

SM11 and SM12 Procedure

  1. Enabled caption preference in player, if present
  2. Play file with captions
  3. Check that captions are displayed and verify that:
    • Captions are synchronized with the audio
    • Captions do not obscure or obstruct relevant information in the video, including faces

FLASH9 Procedure

Watch all video content displayed by your Flash movie. Ensure that:

  1. Captions are available for all audio content, either turned on by default or as a user preference.
  2. Captions are synchronized with the audio and do not obscure or obstruct relevant information in the video, including faces

Test Files