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METS  November 2006

METS November 2006

Subject:

Re: time offsets

From:

Jerome McDonough <[log in to unmask]>

Reply-To:

Metadata Encoding and Transmission Standard <[log in to unmask]>

Date:

Tue, 21 Nov 2006 11:52:57 -0600

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (63 lines)

On Nov 20, 2006, at 8:38 PM, Riley, Jenn wrote:

> Hi all,
>
> I'm faced with a situation where we might need a METS structMap that
> refers to audio files that have in their header an instruction  
> (assumed
> to be read and understood by knowledgeable applications) that the file
> should not begin at time 0, but rather at some arbitrary offset,  
> say, 5
> minutes. I'm wondering what to do with the fptr/area/@begin and @end
> attributes for this file. Should those values be relative to 0 or
> relative to the 5 minute offset? Put another way, should we be  
> assuming
> those reading the METS doc will take the file header information
> indicating the time offset into account or not. I can control this
> behavior in my local environment, but we're concerned with helping  
> wider
> interpretations of this information be done correctly.
>

I need more detail here.  Is this some form of one-off metadata  
that's embedded
in a header, or is this SMPTE or MIDI time code data, or something  
else entirely?

> On a related note, how would we explicitly record this offset
> information in the METS file? I've never used the behaviorSec - my  
> first
> thought is that it might be useful, but I'm having trouble seeing a
> clear machine-readable implementation path for this. We can  
> probably put
> this information in techMD, but I suspect if we can't rely on  
> downstream
> applications to read and understand the audio header information
> indicating the time offset, we can't expect them to do that with the
> technical metadata either.
>

Again, a lot depends on the form the time data is encoded in within  
your file.
If you're using standard SMPTE or MIDI time code values, then  
documenting
their use in the METS technical metadata might be sufficient.  If  
you're using something
that's more unique, you might want more detail, including pointing to  
utility software
to extract the information.  Also, obviously, a huge amount depends  
on what you
anticipate people trying to do with the information.  Does the audio  
need to be
synced with separate video information?  Other audio files?  Are you  
just trying
to record exactly when audio information was captured?

Jerome McDonough, Asst. Professor
Graduate School of Library & Information Science
University of Illinois, Urbana-Champaign
501 E. Daniel Street, Room 202
Champaign, IL 61820
(217) 244-5916
[log in to unmask]

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