[MacDV] Re: DV->JPEGs?
Mark M. Florida
markflo at mac.com
Mon Dec 23 19:14:08 PST 2002
Here ya go... slide transfer adapter (for video camera)
http://shop.store.yahoo.com/ador/cafp100.html
On Monday, December 23, 2002, at 08:57 PM, Mark M. Florida wrote:
> one more thought... if you go the digital still camera route, I
> believe you can get a slide-transfer adapter that just clips onto the
> front of the lens (of course the camera would need good macro
> abilities). You'd just need a good light source to illuminate it.
>
> On Monday, December 23, 2002, at 08:52 PM, Mark M. Florida wrote:
>
>> I would suggest (and yes, it involves a possible equipment purchase)
>> to just use a digital still camera. If you only need enough res for
>> video, then shoot at a lower resolution (give yourself a little extra
>> room, though -- don't go under 800x600 for video use). The color
>> range of most digital cameras is close to the "legal" video
>> color/contrast range, so that shouldn't be a problem -- if anything,
>> just create a Photoshop action to batch process your images to
>> squeeze the colors into the "legal" video spectrum. Another possible
>> advantage of using a digital still camera is: if you shoot at a
>> higher resolution, then you will have a better looking copy in case
>> you want to use these images for something else in the future. Oh...
>> one more thing... if you use iPhoto to import from the still camera,
>> then you have a visual reference for selecting the slides, and you
>> can (fairly) easily export to video by just making a new "Photo
>> Album" of the pictures you want to use, and then exporting to video
>> from there.
>>
>> (I guess you left out what system you have, what kind of camera you
>> have, etc. -- important info for figuring out the best way to do
>> something with what you already have)
>>
>> Also, you might want to look into getting an old A/V Mac -- like a
>> 7100 or 8100 with an A/V card (or even a 7500, 7600 or 8500). You
>> could connect your camera's analog outputs to the analog inputs on
>> the A/V card and use the built-in "Video Player" app to capture still
>> frames -- it automatically saves them in a sequentially numbered
>> sequence -- super convenient!
>>
>> The last option involves a possible software purchase. Premiere has
>> a "Time Tapse" function that you can use either automatically or
>> manually. So you could record your slideshow to video as you
>> described, then use the "Time Lapse" feature to manually capture the
>> clip every time it changes (click a button with your mouse). You
>> could use this feature with any version of Premiere from 4.0 on up to
>> 6.0 (don't know about 6.5 though), and you could use it with an old
>> A/V Mac (Premiere 4-5), or any FireWire Mac (Premiere 6)... So maybe
>> just a couple hundred dollars (at the absolute most) to set up an old
>> A/V Mac with an old version of Premiere.
>>
>> I wouldn't sweat it trying to come up with some crazy software to
>> visually analyze the video (unless you do this kind of programming
>> already). And if you do create something like this, I'm sure you'll
>> have a decent market with some folks on this here e-mail list.
>>
>> So... to sum up your choices:
>>
>> 1. Use a digital camera (or even something like Sony's video cameras
>> with the Memory Stick slot -- I have one and it works fine for
>> capturing video stills)
>>
>> 2. Get an old A/V Mac and use the built-in (clunky) capture software
>> to grab stills from your existing video camera.
>>
>> 3. Get Adobe Premiere 6.x and use the "Time Lapse" feature on any
>> FireWire Mac
>>
>> 4. Get Adobe Premiere 4.x (or 5.x) and use the "Time Lapse" feature
>> on any older A/V Mac (with analog video inputs)
>>
>> 5. Write a video analyzer app that will extract stills when a scene
>> changes? (and sell as shareware maybe?)
>>
>> Just some thoughts.
>>
>> Hope that helps.
>>
>> - Mark
>>
>>
>> On Monday, December 23, 2002, at 05:28 PM, Randy Wilson wrote:
>>
>>> I'm wondering if anyone knows how to take a DV stream and
>>> automatically
>>> extract the individual frames out of it as JPEGs?
>>>
>>> Better yet, are there any libraries out there that give you access to
>>> the actual frames in a DV stream?
>>>
>>> What I want to do is organize a large (>20,000) set of slides. I
>>> thought I could run a DV camcorder while I rifle through the slides
>>> (about 2 seconds per slide). Then I could write a little bit of
>>> code to
>>> examine each frame of the DV stream (either directly, or look at the
>>> pictures extracted from it) in order to determine how bright it is.
>>> By
>>> looking at the brightness level as the frames move along, there will
>>> be
>>> an area of relative darkness, followed by a transition to lightness
>>> (with perhaps some adjustment going on as the auto exposure does its
>>> thing), then sudden darkness again. This would appear, if plotted
>>> out,
>>> as a series of flat plateous and flat valleys with some
>>> overcorrective
>>> transitions between them, along with a bit of noise, of course.
>>> With a
>>> few constraints on how fast/slow the slides are allowed to be pushed
>>> through, it should be possible to find the point a few frames before
>>> each transition begins. Then that frame could be snipped out as its
>>> own
>>> .jpeg file and eventually labeled in such a way as to make it
>>> possible
>>> to find the original slide again (or at least know that it's "about
>>> slide 25" in a particular row in a particular box) when a
>>> high-quality
>>> scan is needed of it.
>>>
>>> What I'd REALLY like, of course, is a slide scanner that was actually
>>> fast [like 3 seconds per slide] with a large slide feeder (like 150+
>>> slides at once), but alas, no such luck.
>>>
>>> In the short term, I want to make a nice 1-hour video featuring a lot
>>> of slides from this collection (maybe 1000). But I'd like to have a
>>> quick scan available to select which ones I want to use. But the
>>> quality of the quick scans--while if displayed on a video
>>> directly--would be too blocky for any sort of smooth zooming/panning
>>> shots.
>>>
>>> Also, is there a format for saving individual miniDV frames in that
>>> would avoid further compression? The frames are already pretty
>>> heavily
>>> compressed. They could be saved as TIFF, of course, but if I wanted
>>> to
>>> save individual frames out and then use them later as still clips in
>>> iMovie, for example, is there a particular format that would avoid
>>> decompression/recompression? Just wondering.
>>>
>>> Wow. That's a lot of questions.
>>>
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>>
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>
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