Re: DV datecode from QuickTime?
Re: DV datecode from QuickTime?
- Subject: Re: DV datecode from QuickTime?
- From: Brian Gardner <email@hidden>
- Date: Mon, 29 Jun 2009 13:34:00 -0700
Hi, Darrin.
Yes, by "travel with the clip" I meant as part of an accessible
data structure within a pro app, after the clip has been imported
from disk into app memory. Specifically, I was wondering if metadata
was accessible (perhaps through a property/value pairing dictionary,
separate track [timecode, subtitle, text, etc] , or any other
structure).
As you say, though, apparently it is not.
So, even if a clip on disk had a datecode (or any other metadata
acquired from an HD camera),
and a QT component that could handle that metadata,
it would still be useless to an FxPlug -- since that metadata would
not be available within the pro app, and no accessor methods are
available to a FxPlug. (Or any other pro app developer mechanism.)
I'm involved with a lot of multiple camera shoots.
The metadata from the cameras is very important.
So, I have a lot of issues similar to these datecode queries.
Currently, I have no clear direction to go for solutions.
I'd like to have the metadata accessible to FxPlugins from with the
pro apps.
So, I was watching this DV datecode discussion in the hopes
to glean some insights.
-- Brian
On Jun 29, 2009, at 11:17 AM, Darrin Cardani wrote:
I don't understand what you mean by "travel with the clip." The clip
is on disk, and the metadata is generally stored inside the same
file which contains the frames of video. So if you move the clip to
another disk, or wherever, the metadata will move with it. The XML
files which describe an FCP or Motion project point to the original
video file on disk, so 3rd party apps just need to access the
original video file at the path stored in the XML project file to
get at the metadata (if they know how to do that).
In the timeline, clips get chopped up and rearranged, so I'm not
sure it would make sense to associate said metadata with any one or
all of the pieces of the original clip. It would probably depend on
the type of metadata. Regardless, it doesn't currently happen in any
way other than as I described above.
There are no mechanisms within the FxPlug API for dealing with
metadata. I believe that QuickTime Components could potentially
create and ingest said metadata, but I don't believe the apps will
do anything with it. And there's no way to get that metadata to an
FxPlug.
Darrin
On Jun 29, 2009, at 10:34 AM, Brian Gardner wrote:
Out of curiosity.... In the pro apps, does QT metadata
generally travel with the clip?
I mean, if QT did support certain metadata, like datecode,
are the pro apps constructed to have that metadata
stay attached to the video clips, inside the pro apps?
Or does that metadata only exist if it is converted
into a separate track or converted into an existing
data mechanism (like timeline position, duration, etc)?
For example, could an import plugin (or even a FxGenerator)
store metadata within a clip's data, which that an FxPlug (filter
or transition)
could later catch/access that metadata and respond to it?
-- Brian
On Jun 29, 2009, at 9:18 AM, Darrin Cardani wrote:
You might get a better answer to this question on the QuickTime
list, since (I think) the DV codec is part of QuickTime. You can
sign up at:
<http://lists.apple.com/mailman/listinfo/quicktime-api>
Darrin
On Jun 26, 2009, at 9:15 PM, Bruce Sharpe wrote:
CatDV probably does read it, but I'm not looking for an
application, I
want a programming interface.
Bruce
On Fri, Jun 26, 2009 at 9:09 PM, Patrick
Sheffield<email@hidden> wrote:
Doesn't CatDV read the Meta Data?
Patrick
On Jun 26, 2009, at 10:04 AM, Bruce Sharpe wrote:
Thanks, Andreas, I'll do that. For what it's worth there seems
to be
lots of information about how to do this with video in AVI
format but
not QuickTime.
Bruce
On Fri, Jun 26, 2009 at 9:37 AM, Andreas
Kiel<email@hidden> wrote:
Hi Bruce,
Though I can't help you I would recommend to google for
recording format
descriptions and their matching SMPTE docs which do describe
these
formats.
This might be a bit difficult as often the SMPTE docs have to be
purchased.
There is nothing "ready made" which comes which the OS.
Regards
Andreas
On 26.06.2009, at 18:18, Bruce Sharpe wrote:
I'm trying to figure out how to get the time-of-day
information that
is encoded in DV/HDV formats (and others?). This is
variously called
datecode or datacode or time-of-day code. It is not timecode
(although
many people confuse the terms).
I've spent a day Googling and grepping QuickTime headers etc.
but
haven't come up with anything. Can someone point me in the
right
direction?
Bruce
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Darrin Cardani
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