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PIG  August 2013

PIG August 2013

Subject:

Re: Specifying format(s) for audiovisual material

From:

Vicky Phillips <[log in to unmask]>

Reply-To:

PREMIS Implementors Group Forum <[log in to unmask]>

Date:

Wed, 21 Aug 2013 09:26:32 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (548 lines)

Hi Dave,
Many thanks for your response..

On Tue, 20 Aug 2013 10:43:12 -0400, Dave Rice <[log in to unmask]> wrote:
>Hi Vicky,
>
>On Aug 19, 2013, at 10:25 AM, Vicky Phillips <[log in to unmask]> 
wrote:
>
>> However with audiovisual material a file can be made up of several 
tracks 
>> e.g. MP2T (Container) has 1 video track (MPEG Version 2 Main@Main) and 
3 
>> audio tracks (MPEG Version 1 Layer 2).  In these types of instances are 
>> you just including PREMIS format element and link to format registry 
just 
>> for the container file (MP2T) or are you repeating PREMIS format 
elements 
>> for tracks within the container?
>
>The details of the tracks are typically much more significant to long 
term digital preservation than simply the formats. For instance to note 
the presence of so many QuickTime file, so many AVI files, and so many MXF 
file only helps the archive maintain necessary demuxers, but it's usually 
the decoder maintenance that is much more crucial since the technical 
variety and affects of interoperability and obsolescence monitoring are 
more severe.
>
I was afraid that this would be the case and that we should really be 
recording format information down to bitstream level and linking formats 
at this level to technical registry too. 
>> I would be really interested to hear how 
>> others are handling these types of file formats.  Also if anyone is 
using 
>> the second suggestion and would be willing to share an example METS 
>> document I would be extremely grateful.
>
>I use the same PREMIS object for the item as a whole (some media is 
presented as a set of files that are related through concatenation or 
synchronization) so if the file count is greater than one the 
representation type of object is used. Then one PREMIS object per file 
where the format refers to the container format. In order to better 
automate this with diverse audiovisual collections I use libavformat as a 
registry with ffprobe's metadata tool. Then for each track of each file 
there is another object used, this time noting the fourcc, UMID, or codec 
identifier and related registry information from libavcodec. Because of 
this there ends up being a large amount of relationships such as:
>
>    <relationship>
>      <relationshipType>structural</relationshipType>
>      <relationshipSubType>includes</relationshipSubType>
>      <relatedObjectIdentification>
>        <relatedObjectIdentifierType>DHCSMN</relatedObjectIdentifierType>
>        
<relatedObjectIdentifierValue>10bit_v210.mov:audio:0</relatedObjectIdentifi
erValue>
>      </relatedObjectIdentification>
>    </relationship>
>
>Some audiovisual container formats give an index number to each stream 
but some don't. In those I count by order in the file format starting from 
zero.
>
>Note that some tracks are compound streams and have many integrated 
datastreams such as a DV encoding that contains captioning data, timecode, 
audio and video. Some other tracks have substreams such as audio tracks 
that include lossy encodings and then the difference between that and a 
lossless output, so sometimes you may to evaluate to the substream level.
>
I think I follow you, but just to make sure... 
I first of all have the PBCore output as follows...
<METS:techMD ID="techMD_PBCore">
            <METS:mdWrap MDTYPE="OTHER" OTHERMDTYPE="PBCore">
                <METS:xmlData>
                    <pbcore:pbcoreInstantiationDocument>
                        <pbcore:instantiationIdentifier source="File Name"
                            
>aoaaa00056934.mpg</pbcore:instantiationIdentifier>
                        <pbcore:instantiationDate dateType="File Modified 
Date"
                            >2013-03-
12T08:44:15Z</pbcore:instantiationDate>
                        <pbcore:instantiationDigital source="MediaInfoLib" 
version="0.7.62"
                            >video/MP2T</pbcore:instantiationDigital>
                        <pbcore:instantiationStandard profile="" 
source="MediaInfoLib"
                            version="0.7.62">MPEG-
TS</pbcore:instantiationStandard>
                        
<pbcore:instantiationLocation>/home/rdw/aoaaa00056934.mpg</pbcore:instantia
tionLocation>
                        <pbcore:instantiationMediaType source="PBCore" 
version="1.1">Moving
                            Image</pbcore:instantiationMediaType>
                        <pbcore:instantiationFileSize 
unitsOfMeasure="bytes"
                            >1194508196</pbcore:instantiationFileSize>
                        
<pbcore:instantiationTimeStart>11:46:04.028</pbcore:instantiationTimeStart>
                        
<pbcore:instantiationDuration>01:01:59.862</pbcore:instantiationDuration>
                        <pbcore:instantiationDataRate 
unitsOfMeasure="bits/second"
                            >2568797</pbcore:instantiationDataRate>
                        <pbcore:instantiationTracks>1 video track, 3 audio
                            tracks</pbcore:instantiationTracks>
                        <pbcore:instantiationChannelConfiguration>MPEG 
Video with MPEG Audio, MPEG
                            Audio, MPEG 
Audio</pbcore:instantiationChannelConfiguration>
                        <pbcore:instantiationEssenceTrack>
                            
<pbcore:essenceTrackType>Video</pbcore:essenceTrackType>
                            <pbcore:essenceTrackIdentifier 
source="Mediainfo.ID"
                                >570</pbcore:essenceTrackIdentifier>
                            <pbcore:essenceTrackIdentifier 
source="Mediainfo.StreamKindID"
                                >0</pbcore:essenceTrackIdentifier>
                            <pbcore:essenceTrackEncoding ref="2" 
annotation="">Version 2
                                Main@Main</pbcore:essenceTrackEncoding>
                            <pbcore:essenceTrackFrameRate>25.000 
fps</pbcore:essenceTrackFrameRate>
                            <pbcore:essenceTrackBitDepth>8 
bit</pbcore:essenceTrackBitDepth>
                            
<pbcore:essenceTrackFrameSize>544x576</pbcore:essenceTrackFrameSize>
                            
<pbcore:essenceTrackAspectRatio>16:9</pbcore:essenceTrackAspectRatio>
                            
<pbcore:essenceTrackTimeStart>11:46:04.466</pbcore:essenceTrackTimeStart>
                            
<pbcore:essenceTrackDuration>01:01:59.680</pbcore:essenceTrackDuration>
                            <pbcore:essenceTrackAnnotation 
annotationType="StreamOrder"
                                >0-0</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="MenuID"
                                >8456</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Format_Settings_BVOP"
                                >Yes</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation
                                
annotationType="Format_Settings_BVOP_String"
                                >Yes</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Format_Settings_Matrix"
                                >Custom</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation
                                
annotationType="Format_Settings_Matrix_String"
                                >Custom</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation
                                
annotationType="Format_Settings_Matrix_Data"
                                
>10111112121213131313141414141415151515151516161616161616171717171717171718
181819181818191A1A1A1A191B1B1B1B1B1C1C1C1C1E1E1E1F1F21</pbcore:essenceTrack
Annotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Format_Settings_GOP">M=3,
                                N=12</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="BitRate_Mode"
                                >VBR</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="BitRate_Maximum"
                                >15000000</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="PixelAspectRatio"
                                >1.882</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="DisplayAspectRatio"
                                >1.778</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="ActiveFormatDescription"
                                >14</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation
                                
annotationType="ActiveFormatDescription_String">Letterbox 16:9
                                image, with alternative 14:9 
center</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation
                                
annotationType="ActiveFormatDescription_MuxingMode"
                                >A/53</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="FrameCount"
                                >92992</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="ColorSpace"
                                >YUV</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="ChromaSubsampling"
                                >4:2:0</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="ScanType"
                                >Interlaced</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="ScanOrder"
                                >TFF</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Compression_Mode"
                                >Lossy</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Compression_Mode_String"
                                >Lossy</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Delay_Source"
                                >Container</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Delay_Source_String"
                                >Container</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="BufferSize"
                                >206848</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="intra_dc_precision"
                                >8</pbcore:essenceTrackAnnotation>
                        </pbcore:instantiationEssenceTrack>
                        <pbcore:instantiationEssenceTrack>
                            
<pbcore:essenceTrackType>Audio</pbcore:essenceTrackType>
                            <pbcore:essenceTrackIdentifier 
source="Mediainfo.ID"
                                >571</pbcore:essenceTrackIdentifier>
                            <pbcore:essenceTrackIdentifier 
source="Mediainfo.StreamKindID"
                                >0</pbcore:essenceTrackIdentifier>
                            <pbcore:essenceTrackEncoding ref="4" 
annotation="">Version 1 Layer
                                2</pbcore:essenceTrackEncoding>
                            <pbcore:essenceTrackDataRate 
unitsOfMeasure="bits/second"
                                
annotation="CBR">128000</pbcore:essenceTrackDataRate>
                            <pbcore:essenceTrackSamplingRate>48
                                kHz</pbcore:essenceTrackSamplingRate>
                            
<pbcore:essenceTrackTimeStart>11:46:04.136</pbcore:essenceTrackTimeStart>
                            
<pbcore:essenceTrackDuration>01:01:59.880</pbcore:essenceTrackDuration>
                            
<pbcore:essenceTrackLanguage>eng</pbcore:essenceTrackLanguage>
                            <pbcore:essenceTrackAnnotation 
annotationType="Channels"
                                >2</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="StreamOrder"
                                >0-1</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="MenuID"
                                >8456</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="BitRate_Mode"
                                >CBR</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="SamplingCount"
                                >178554240</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="FrameCount"
                                >154995</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Compression_Mode"
                                >Lossy</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Compression_Mode_String"
                                >Lossy</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Delay_Source"
                                >Container</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Delay_Source_String"
                                >Container</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="StreamSize"
                                >59518080</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="StreamSize_Proportion"
                                >0.04983</pbcore:essenceTrackAnnotation>
                        </pbcore:instantiationEssenceTrack>
                        <pbcore:instantiationEssenceTrack>
                            
<pbcore:essenceTrackType>Audio</pbcore:essenceTrackType>
                            <pbcore:essenceTrackIdentifier 
source="Mediainfo.ID"
                                >572</pbcore:essenceTrackIdentifier>
                            <pbcore:essenceTrackIdentifier 
source="Mediainfo.StreamKindID"
                                >1</pbcore:essenceTrackIdentifier>
                            <pbcore:essenceTrackEncoding ref="4" 
annotation="">Version 1 Layer
                                2</pbcore:essenceTrackEncoding>
                            <pbcore:essenceTrackDataRate 
unitsOfMeasure="bits/second"
                                
annotation="CBR">128000</pbcore:essenceTrackDataRate>
                            <pbcore:essenceTrackSamplingRate>48
                                kHz</pbcore:essenceTrackSamplingRate>
                            
<pbcore:essenceTrackTimeStart>11:46:04.176</pbcore:essenceTrackTimeStart>
                            
<pbcore:essenceTrackDuration>01:01:59.832</pbcore:essenceTrackDuration>
                            
<pbcore:essenceTrackLanguage>cym</pbcore:essenceTrackLanguage>
                            <pbcore:essenceTrackAnnotation 
annotationType="Channels"
                                >2</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="StreamOrder"
                                >0-2</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="MenuID"
                                >8456</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="BitRate_Mode"
                                >CBR</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="SamplingCount"
                                >178551936</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="FrameCount"
                                >154993</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Compression_Mode"
                                >Lossy</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Compression_Mode_String"
                                >Lossy</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Delay_Source"
                                >Container</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Delay_Source_String"
                                >Container</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="StreamSize"
                                >59517312</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="StreamSize_Proportion"
                                >0.04983</pbcore:essenceTrackAnnotation>
                        </pbcore:instantiationEssenceTrack>
                        <instantiationEssenceTrack>
                            
<pbcore:essenceTrackType>Audio</pbcore:essenceTrackType>
                            <pbcore:essenceTrackIdentifier 
source="Mediainfo.ID"
                                >573</pbcore:essenceTrackIdentifier>
                            <pbcore:essenceTrackIdentifier 
source="Mediainfo.StreamKindID"
                                >2</pbcore:essenceTrackIdentifier>
                            <pbcore:essenceTrackEncoding ref="4" 
annotation=""
                                >4</pbcore:essenceTrackEncoding>
                            
<pbcore:essenceTrackLanguage>cym</pbcore:essenceTrackLanguage>
                            <pbcore:essenceTrackAnnotation 
annotationType="StreamOrder"
                                >0-3</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="MenuID"
                                >8456</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Compression_Mode"
                                >Lossy</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Compression_Mode_String"
                                >Lossy</pbcore:essenceTrackAnnotation>
                            <pbcore:essenceTrackAnnotation 
annotationType="Language_More">Visual
                                impaired 
commentary</pbcore:essenceTrackAnnotation>
                        </instantiationEssenceTrack>
                        <pbcore:instantiationAnnotation 
annotationType="Container"
                            >MPEG-TS</pbcore:instantiationAnnotation>
                        <pbcore:instantiationAnnotation annotationType="ID"
                            >8205</pbcore:instantiationAnnotation>
                        <pbcore:instantiationAnnotation 
annotationType="OverallBitRate_Mode"
                            >VBR</pbcore:instantiationAnnotation>
                        <pbcore:instantiationAnnotation 
annotationType="Delay"
                            
>42364027.712481</pbcore:instantiationAnnotation>
                        <pbcore:instantiationAnnotation 
annotationType="Delay_String">11h
                            46mn</pbcore:instantiationAnnotation>
                        <pbcore:instantiationAnnotation 
annotationType="Delay_String1">11h 46mn 4s
                            28ms</pbcore:instantiationAnnotation>
                        <pbcore:instantiationAnnotation 
annotationType="Delay_String2">11h
                            46mn</pbcore:instantiationAnnotation>
                        <pbcore:instantiationAnnotation 
annotationType="File_Modified_Date"
                            >2013-03-
12T08:44:15Z</pbcore:instantiationAnnotation>
                        <pbcore:instantiationAnnotation 
annotationType="File_Modified_Date_Local"
                            >2013-03-
12T08:44:15</pbcore:instantiationAnnotation>
                    </pbcore:pbcoreInstantiationDocument>
                </METS:xmlData>
            </METS:mdWrap>
        </METS:techMD>

Then I have PREMIS object for the archive level file which contains 
checksums, format information for container along with reference to PRONOM 
and then PREMIS relationship for tracks within archive file.

<METS:techMD ID="techMD_PREMIS-CRC-ARCHIVE">
            <METS:mdWrap MDTYPE="PREMIS:OBJECT">
                <METS:xmlData>
                    <premis:objectIdentifier>
                        
<premis:objectIdentifierType>WlAbNL_METS_AOAAA000006576</premis:objectIdent
ifierType>
                        
<premis:objectIdentifierValue>fileID1</premis:objectIdentifierValue>
                    </premis:objectIdentifier>
                    <premis:objectCatagory>file</premis:objectCatagory>
                    <premis:objectCharacteristics>
                        
<premis:compositionLevel>0</premis:compositionLevel>
                        <premis:fixity>
                            
<premis:messageDigestAlgorithm>MD5</premis:messageDigestAlgorithm>
                            
<premis:messageDigest>b17221b6f784f82e09d64820f5326fce</premis:messageDiges
t>
                        </premis:fixity>
                        <premis:fixity>
                            <premis:messageDigestAlgorithm>SHA-
1</premis:messageDigestAlgorithm>
                            
<premis:messageDigest>91036216cd7001fdff4ae509e8da441b2caa0423</premis:mess
ageDigest>
                        </premis:fixity>
                        <!--Record format with reference to PRONOM format 
registry -->
                        <premis:format>
                            <premis:formatDesignation>
                                <!-- formatName e.g. MPEG Transport 
Stream. Information obtained from MediaInfo ouput-->
                                <premis:formatName>MPEG Transport 
Stream</premis:formatName>
                                <!-- e.g. 2. Information obtained from 
MediaInfo ouput -->
                                
<premis:formatVersion>2</premis:formatVersion>
                            </premis:formatDesignation>
                            <premis:formatRegistry>
                                <!-- formatRegistryName e.g.PRONOM -->
                                
<premis:formatRegistryName>##FILL_ME##</premis:formatRegistryName>
                                <!-- formatRegistryKey e.g. fmt/9 -->
                                
<premis:formatRegistryKey>##FILL_ME##</premis:formatRegistryKey>
                                
<premis:formatRegistryRole>specification</premis:formatRegistryRole>
                            </premis:formatRegistry>
                        </premis:format>
                    </premis:objectCharacteristics>
                    <premis:significantProperties>
                        
<premis:significantPropertiesType>content</premis:significantPropertiesType
>
                        <premis:significantPropertiesValue>content
                            only</premis:significantPropertiesValue>
                    </premis:significantProperties>
                    <!-- Relationship of Tracks within MP2T -->
                    <premis:relationship>
                        
<premis:relationshipType>structural</premis:relationshipType>
                        
<premis:relationshipSubType>includes</premis:relationshipSubType>
                        <premis:relatedObjectIdentification>
                            
<premis:relatedObjectIdentifierType>WlAbNL_METS_AOAAA000006576</premis:rela
tedObjectIdentifierType>
                            <premis:relatedObjectIdentifierValue>TrackID 
570</premis:relatedObjectIdentifierValue>
                        </premis:relatedObjectIdentification>
                        <premis:relatedObjectIdentification>
                            
<premis:relatedObjectIdentifierType>WlAbNL_METS_AOAAA000006576</premis:rela
tedObjectIdentifierType>
                            <premis:relatedObjectIdentifierValue>TrackID 
571</premis:relatedObjectIdentifierValue>
                        </premis:relatedObjectIdentification>
                        <premis:relatedObjectIdentification>
                            
<premis:relatedObjectIdentifierType>WlAbNL_METS_AOAAA000006576</premis:rela
tedObjectIdentifierType>
                            <premis:relatedObjectIdentifierValue>TrackID 
572</premis:relatedObjectIdentifierValue>
                        </premis:relatedObjectIdentification>
                    </premis:relationship>

And finally PREMIS object for each track (bitstream) within the container 
as follows...

<METS:techMD ID="techMD_BITSTREAM-1">
            <METS:mdWrap MDTYPE="PREMIS:OBJECT">
                <METS:xmlData>
                    <premis:objectIdentifier>
                        
<premis:objectIdentifierType>WlAbNL_METS_AOAAA000006576</premis:objectIdent
ifierType>
                        <premis:objectIdentifierValue>TrackID 
570</premis:objectIdentifierValue>
                    </premis:objectIdentifier>
                    
<premis:objectCategory>bitstream</premis:objectCategory>
                    <premis:objectCharacteristics>
                        
<premis:compositionLevel>0</premis:compositionLevel>
                        <premis:format>
                            <premis:formatDesignation>
                                <premis:formatName>MPEG</premis:formatName>
                                
<premis:formatVersion>2</premis:formatVersion>
                            </premis:formatDesignation>
                            <premis:formatRegistry>
                                
<premis:formatRegistryName>PRONOM</premis:formatRegistryName>
                                <premis:formatRegistryKey>???
</premis:formatRegistryKey>
                            </premis:formatRegistry>
                            <premis:formatNote>IMX 50 
4:2:2@main</premis:formatNote>
                        </premis:format>
                    </premis:objectCharacteristics>
                </METS:xmlData>
            </METS:mdWrap>
        </METS:techMD>

Does that look ok?

Is anyone using EBUCore for holding technical metadata?

Many thanks,
Vicky

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