- From: Thierry MICHEL <tmichel@w3.org>
- Date: Wed, 29 Jun 2011 13:58:31 +0200
- To: "public-media-annotation@w3.org" <public-media-annotation@w3.org>
resent to the group
-------- Message original --------
Sujet: Re: Flash container example for the Ontology for Media Resources 1.0
Date : Mon, 20 Jun 2011 15:06:07 -0700
De : Alan Lillich <alillich@adobe.com>
Pour : Felix Sasaki <felix.sasaki@dfki.de>
Copie à : tmichel@w3.org <tmichel@w3.org>
Felix,
I know I'm confused as to exactly what you guys want. And I think you
might be confused about the use of metadata in FLV and F4V. There is no
such thing as an "XMP sidecar" for FLV and F4V. The XMP is embedded.
I've extracted that XMP and sent it below. There are separate issues
with non-XMP metadata in FLV and F4V.
In the case of FLV there is a smallish "onMetaData" tag that contains
technical metadata. There is no RDF form for this. It is binary
metadata, the details are in the FLV file format spec. The sample file
that Frank sent contains these values (partial output from an FLV dump
tool we have):
onMetaData @ 0x18 : ECMA array [10]
duration @ 0x2A : float = 24.858000
width @ 0x3D : float = 320.000000
height @ 0x4D : float = 160.000000
videodatarate @ 0x5E : float = 250.000000
framerate @ 0x76 : float = 23.976013
videocodecid @ 0x8A : float = 4.000000
audiodatarate @ 0xA1 : float = 128.000000
audiodelay @ 0xB9 : float = 0.027000
audiocodecid @ 0xCE : float = 2.000000
canSeekToEnd @ 0xE5 : bool = 1
The "@ 0x..." part is a file offset. None of this is implicitly mapped
to XMP by the Adobe XMP Toolkit SDK, although the app creating the FLV
can duplicate some of this in the xmpDM: namespace. And did in the
example Frank sent.
In the case of F4V, any MPEG-4 as far as Adobe is concerned, there is
some technical metadata scattered around the file as shown in 5.2.3.2.2
F4V. And sometimes requiring computation. I don't have an easy way to
dump this technical metadata from a file. Like the FLV example, the
creation app choose to duplicate some of this info in the XMP's xmpDM
namespace.
=================================
XMP from AdobeBand_800K_H264_1.flv:
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:xmp="http://ns.adobe.com/xap/1.0/">
<xmp:CreateDate>2011-06-07T21:50:44.00304+05:30</xmp:CreateDate>
<xmp:ModifyDate>2011-06-07T21:50:47.0021+05:30</xmp:ModifyDate>
<xmp:MetadataDate>2011-06-07T21:50:47+05:30</xmp:MetadataDate>
<xmp:NativeDigests rdf:parseType="Resource">
<xmp:FLV>BE43924B4416E4ABD0ABEFCA877AB863</xmp:FLV>
</xmp:NativeDigests>
</rdf:Description>
<rdf:Description rdf:about=""
xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
xmlns:stEvt="http://ns.adobe.com/xap/1.0/sType/ResourceEvent#">
<xmpMM:OriginalDocumentID>xmp.did:CDB5C2062291E011985F90416E3DB9C2</xmpMM:OriginalDocumentID>
<xmpMM:InstanceID>xmp.iid:D1B5C2062291E011985F90416E3DB9C2</xmpMM:InstanceID>
<xmpMM:DocumentID>xmp.did:D1B5C2062291E011985F90416E3DB9C2</xmpMM:DocumentID>
<xmpMM:History>
<rdf:Seq>
<rdf:li rdf:parseType="Resource">
<stEvt:action>saved</stEvt:action>
<stEvt:instanceID>xmp.iid:CEB5C2062291E011985F90416E3DB9C2</stEvt:instanceID>
<stEvt:when>2011-06-07T21:50:14+05:30</stEvt:when>
<stEvt:softwareAgent>Adobe Adobe Media Encoder
5.0.0</stEvt:softwareAgent>
<stEvt:changed>/metadata</stEvt:changed>
</rdf:li>
<rdf:li rdf:parseType="Resource">
<stEvt:action>saved</stEvt:action>
<stEvt:instanceID>xmp.iid:CFB5C2062291E011985F90416E3DB9C2</stEvt:instanceID>
<stEvt:when>2011-06-07T21:50:24+05:30</stEvt:when>
<stEvt:softwareAgent>Adobe Adobe Media Encoder
5.0.0</stEvt:softwareAgent>
<stEvt:changed>/metadata</stEvt:changed>
</rdf:li>
<rdf:li rdf:parseType="Resource">
<stEvt:action>saved</stEvt:action>
<stEvt:instanceID>xmp.iid:D1B5C2062291E011985F90416E3DB9C2</stEvt:instanceID>
<stEvt:when>2011-06-07T21:50:47+05:30</stEvt:when>
<stEvt:softwareAgent>Adobe Adobe Media Encoder
5.0.0</stEvt:softwareAgent>
</rdf:li>
</rdf:Seq>
</xmpMM:History>
</rdf:Description>
<rdf:Description rdf:about=""
xmlns:xmpDM="http://ns.adobe.com/xmp/1.0/DynamicMedia/"
xmlns:stDim="http://ns.adobe.com/xap/1.0/sType/Dimensions#">
<xmpDM:videoFrameRate>23.976024</xmpDM:videoFrameRate>
<xmpDM:videoFieldOrder>Progressive</xmpDM:videoFieldOrder>
<xmpDM:videoPixelAspectRatio>1/1</xmpDM:videoPixelAspectRatio>
<xmpDM:audioSampleRate>44100</xmpDM:audioSampleRate>
<xmpDM:audioSampleType>Compressed</xmpDM:audioSampleType>
<xmpDM:audioChannelType>Stereo</xmpDM:audioChannelType>
<xmpDM:duration rdf:parseType="Resource">
<xmpDM:value>2248320</xmpDM:value>
<xmpDM:scale>1/90000</xmpDM:scale>
</xmpDM:duration>
<xmpDM:startTimecode rdf:parseType="Resource">
<xmpDM:timeFormat>23976Timecode</xmpDM:timeFormat>
<xmpDM:timeValue>00:00:00:00</xmpDM:timeValue>
</xmpDM:startTimecode>
<xmpDM:videoFrameSize rdf:parseType="Resource">
<stDim:w>320</stDim:w>
<stDim:h>160</stDim:h>
<stDim:unit>pixel</stDim:unit>
</xmpDM:videoFrameSize>
<xmpDM:altTimecode rdf:parseType="Resource">
<xmpDM:timeValue>00:00:00:00</xmpDM:timeValue>
<xmpDM:timeFormat>23976Timecode</xmpDM:timeFormat>
</xmpDM:altTimecode>
</rdf:Description>
<rdf:Description rdf:about=""
xmlns:dc="http://purl.org/dc/elements/1.1/">
<dc:format>FLV | F4V</dc:format>
</rdf:Description>
</rdf:RDF>
===============================
XMP from AdobeBand_800K_H264.f4v:
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:xmp="http://ns.adobe.com/xap/1.0/">
<xmp:CreateDate>2011-06-06T21:50:24+05:30</xmp:CreateDate>
<xmp:ModifyDate>2011-06-06T21:50:24+05:30</xmp:ModifyDate>
<xmp:MetadataDate>2011-06-07T21:50:26+05:30</xmp:MetadataDate>
</rdf:Description>
<rdf:Description rdf:about=""
xmlns:xmpDM="http://ns.adobe.com/xmp/1.0/DynamicMedia/"
xmlns:stDim="http://ns.adobe.com/xap/1.0/sType/Dimensions#">
<xmpDM:videoFrameRate>23.976024</xmpDM:videoFrameRate>
<xmpDM:videoFieldOrder>Progressive</xmpDM:videoFieldOrder>
<xmpDM:videoPixelAspectRatio>1/1</xmpDM:videoPixelAspectRatio>
<xmpDM:audioSampleRate>44100</xmpDM:audioSampleRate>
<xmpDM:audioSampleType>Compressed</xmpDM:audioSampleType>
<xmpDM:audioChannelType>Stereo</xmpDM:audioChannelType>
<xmpDM:duration rdf:parseType="Resource">
<xmpDM:value>2237234</xmpDM:value>
<xmpDM:scale>1/90000</xmpDM:scale>
</xmpDM:duration>
<xmpDM:startTimecode rdf:parseType="Resource">
<xmpDM:timeFormat>23976Timecode</xmpDM:timeFormat>
<xmpDM:timeValue>00:00:00:00</xmpDM:timeValue>
</xmpDM:startTimecode>
<xmpDM:videoFrameSize rdf:parseType="Resource">
<stDim:w>320</stDim:w>
<stDim:h>160</stDim:h>
<stDim:unit>pixel</stDim:unit>
</xmpDM:videoFrameSize>
<xmpDM:altTimecode rdf:parseType="Resource">
<xmpDM:timeValue>00:00:00:00</xmpDM:timeValue>
<xmpDM:timeFormat>23976Timecode</xmpDM:timeFormat>
</xmpDM:altTimecode>
</rdf:Description>
<rdf:Description rdf:about=""
xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
xmlns:stEvt="http://ns.adobe.com/xap/1.0/sType/ResourceEvent#">
<xmpMM:OriginalDocumentID>xmp.did:CDB5C2062291E011985F90416E3DB9C2</xmpMM:OriginalDocumentID>
<xmpMM:InstanceID>xmp.iid:D0B5C2062291E011985F90416E3DB9C2</xmpMM:InstanceID>
<xmpMM:DocumentID>xmp.did:D0B5C2062291E011985F90416E3DB9C2</xmpMM:DocumentID>
<xmpMM:History>
<rdf:Seq>
<rdf:li rdf:parseType="Resource">
<stEvt:action>saved</stEvt:action>
<stEvt:instanceID>xmp.iid:CEB5C2062291E011985F90416E3DB9C2</stEvt:instanceID>
<stEvt:when>2011-06-07T21:50:14+05:30</stEvt:when>
<stEvt:softwareAgent>Adobe Adobe Media Encoder
5.0.0</stEvt:softwareAgent>
<stEvt:changed>/metadata</stEvt:changed>
</rdf:li>
<rdf:li rdf:parseType="Resource">
<stEvt:action>saved</stEvt:action>
<stEvt:instanceID>xmp.iid:D0B5C2062291E011985F90416E3DB9C2</stEvt:instanceID>
<stEvt:when>2011-06-07T21:50:26+05:30</stEvt:when>
<stEvt:softwareAgent>Adobe Adobe Media Encoder
5.0.0</stEvt:softwareAgent>
</rdf:li>
</rdf:Seq>
</xmpMM:History>
</rdf:Description>
<rdf:Description rdf:about=""
xmlns:dc="http://purl.org/dc/elements/1.1/">
<dc:format>FLV | F4V</dc:format>
</rdf:Description>
</rdf:RDF>
hope this helps somewhat,
Alan
Received on Wednesday, 29 June 2011 11:58:47 UTC