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Re: RE : Recapitulation of ma:format vs. ma:compression.

From: David Singer <singer@apple.com>
Date: Sun, 30 Jan 2011 07:26:53 +0900
Cc: Joakim Söderberg <joakim.soderberg@ericsson.com>, Daniel Park <soohongp@gmail.com>, "public-media-annotation@w3.org" <public-media-annotation@w3.org>
Message-Id: <8EFB3384-18B8-45DC-83B5-18191DA14579@apple.com>
To: tmichel@w3.org
In further discussion, it seems that using anchor syntax and a # as the separator is cleaner.  Can we change to

>> attValue="URI#Name"

>>     compression="urn:example-org:codingnames2010#ITU-H264"
>>     compression="http://example.net/standards/codecs#G711"

with corresponding changes to the text?

On Jan 29, 2011, at 23:28 , Thierry MICHEL wrote:

> 
>> compression	
>> 
>> (attName="compression", attValue="URI" | "String")	
>> 
>> The compression type used. For container files (e.g., QuickTime, AVI), the compression is not defined by the format, as a container file can have several tracks that each use different encodings. In such a case, several compression instances SHOULD be used. Thus, querying the compression property of the track media fragments will return different values for each track fragment. Note: it is possible to use an extendedMIME type as the value for this property, see [RFC 4281].
>> 
>> 
>> 
>> suggested change to
>> 
>> compression	
>> 
>> (attName="compression", attValue="URI, String")	
>> 
>> The compression type used. For container files (e.g., QuickTime, AVI), the compression is not defined by the format, as a container file can have several tracks that each use different encodings. In such a case, several compression instances SHOULD be used. Thus, querying the compression property of the track media fragments will return different values for each track fragment.   The indicator is a pair of values, separated by a comma. The first is a URI that identifies the naming convention used for the second parameter, which is a string.  For some container files, the format parameter can also carry an extended MIME type to document this; see [RFC 4281] for one such instance.
>> 
>> Examples:
>>     compression="urn:example-org:codingnames2010, ITU-H264"
>>     compression="http://example.net/standards/codecs, G711"
>> where ITU-H264 and G711 are defined by example.org (who also defined a URN to identify their naming conventions), and by example.net (who use a URL to identify theirs).
>> 
> 
> 
> Updated the compression Statement.
> http://dev.w3.org/2008/video/mediaann/mediaont-1.0/mediaont-1.0.html#core-property-lists
> 
> For the examples; I have added a link to the following section, which contains the examples.
> 
> 5.1.3.1 Examples for the compression property
> 
> Best,
> 
> Thierry
> 

David Singer
Multimedia and Software Standards, Apple Inc.
Received on Saturday, 29 January 2011 22:27:59 GMT

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