The mpeg4 format can technically handle frame-by-frame (or frame-as-
needed) annotations and has been used to include location data.
Unfortunately there do not seem to be good open-source tools for
managing this yet. Such location frames were added to video in OGC's
OWS-3 testbed (GeoVideo) but MS Media Player was needed to work with
it. Apple's ChapterTool allows a variety of metadata, esp. media
references, to be added to an m4a or m4b file (but playback is
limited to itunes, etc.).
This would be a great area for extending GeoRSS to reference media
segments, but the development of tools to support it might be
complicated by patent issues.
Josh Lieberman
On Jun 6, 2006, at 4:16 AM, Rich Gibson wrote:
I agree that georeferencing audio files is a Good Thing. I did some
work on georeferencing the audio files from my Olympus voice recorder.
They have this 'DSS' file format. It has a header that is readable
so I wrote the Audio::DSS perl module to read the meta data.
Of interest is the starting time, ending time (last edited time), and
track length. I then synced that up with track logs to create a
continuous georeference.
Having a single point for an audio recording is probably a good
simplification, but it sort of bugs me. I often do sound recording
while I'm moving. I would like my recordings to be represented as
tracks, rather than single points. Back 'in the day' I had a number
of clever names for this. I just checked and all the domains I
considered are now being used to sell google ads or cell phone ring
tones :-)
The simplest use case is for audio travel annotations: local history,
geology, etc. A person can record a commentary while traveling ( or
create one after the fact to match a specific area ), add the right
meta data, including locations for the track, rather than a single
point, and rely on sufficiently magic technology to adjust the
playback to match the actual speed of the listener.
So if something was timed to be heard while travelling 60 mph, it
could be adjusted with pauses, or pitch compression, to match your
actual speed. The content creator can then also embed 'key frames'
into the audio. For example, 'at 55 seconds in, your should be at
this location' which allows the commentary to have things like 'look
at the road cut into late cretaceous shale on your left, then look
right at the alluvial fan into the dried lake.'
(okay...the lines are not truly continuous, since they rely on a
series of individual positions, but continuous enough. As the quote
on electronics goes 'we don't actually know if DC current exists,
since we have not been able to measure any DC source for long
enough...maybe it just cycles very slowly :-)
On 6/3/06, Russ Nelson <[EMAIL PROTECTED]> wrote:
http://russnelson.com/georeferencing-mp3s.html
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Rich Gibson
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http://mappinghacks.com
http://geocoder.us
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