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Re: Systematic access to media/plugin metadata

From: Eric Carlson <eric.carlson@apple.com>
Date: Tue, 12 Apr 2011 11:51:57 -0700
Cc: Henri Sivonen <hsivonen@iki.fi>, Silvia Pfeiffer <silviapfeiffer1@gmail.com>, Danny Ayers <danny.ayers@gmail.com>, "public-html@w3.org" <public-html@w3.org>
Message-id: <6789C6C8-2436-4F1B-BFA4-A24D51BD142D@apple.com>
To: Laura Carlson <laura.lee.carlson@gmail.com>

On Apr 12, 2011, at 10:42 AM, Laura Carlson wrote:

> Hi Eric,
> 
> On 4/12/11, Eric Carlson <eric.carlson@apple.com> wrote:
>> Laura -
>> 
>> On Apr 12, 2011, at 10:14 AM, Laura Carlson wrote:
>> 
>>> 
>>> Silvia, maybe accessing video and audio transcripts would be a another
>>> use case to add. I don't know. Would that be applicable? Transcripts
>>> may be embedded in a video but when people are on a dialup modem, (I
>>> am a majority of the time), they have no way to obtain that transcript
>>> unless the author remembers to supply a link to the transcript in the
>>> body of the document. In this use case they are locked out of all
>>> video content.
>>> 
>>  Textual transcripts embedded in a video file are available to script
>> though the Track API [1].
> 
> How does the end user obtain the transcripts if there is no script?
> 
  They can't, but as far as I know there is no standard way to mark a text track in an audio or video file as a "transcript" so a script with hard-coded knowledge about the contents of such a movie will be required for this anyway.

  In any case all of the samples in a media file are typically intermixed, eg. a text track will be broken up into small chunks and spread throughout the file. This means that it isn't usually possible to load only a text track, and in your example of a user with a slow network connection it will be necessary to download the entire video file even if they only want the transcript.

eric
Received on Tuesday, 12 April 2011 18:52:27 UTC

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