Re: Camcorder/GolfSwing Technology Question
- From: "Dave Lee" <DaveLeeNC@xxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 21 Oct 2005 11:20:50 GMT
Re: Attached
Thanks, Bill. That last comment explains a lot as there really is a real
time issue to deal with.
dave
"Birdie Bill" <bighorn_bill@xxxxxxxxxxx> wrote in message
news:1129868950.663980.131040@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Birdie Bill wrote:
> > Dave Lee wrote:
> > > 1) cSwing recommends a specific line of camcorders because they have
> > > explicit shutter speed controls. They state that this is superior to
the
> > > "Sports Mode" that is more common. However it is my understanding that
the
> > > "Sports Mode" sets the shutter speed to the fastest possible for the
> > > existing lighting conditions. If this is the case why would I need
manual
> > > control?
> >
> > You really don't. However, some camcorders do much better in low-light
> > situations than others. This translates also into higher shutter
> > speed for the same light level. So that's one of the things you
> > might want to compare when you make your choice. Usually this
> > is related to the size of the lense.
> >
> > >
> > > 2) cSwing specifically recommends a Firewire connection, as "in USB
the
> > > video quality is poor". If I were trying to do genuine video capture
with my
> > > old camcorder I can see why the speed of the connection matters (no
buffer
> > > so everything has to be done in real time). But in this case I assume
that
> > > the data in the CCD chip (chips?) is continuously being formatted and
dumped
> > > to an internal tape (or some kind of digital storage) inside the
camera. I
> > > don't know whether the .avi (or whatever) files that ultimately get
stored
> > > on your computer are built inside the camera or in software supplied
by the
> > > camera manufacturer and built on the computer. But in either case
there
> > > would not seem to be a real time limitation, so the speed of the
interface
> > > should not affect the final result (only the time it takes to get it).
> > >
> > > But the cSwing site seems pretty intent on stating that Firewire
speeds are
> > > required for the best resolution (is Firewire a wider bandwidth than
USB2?).
> > > Additionally I have seen this process referred to as "capture" which
is
> > > somehow different than how I would describe my understanding (or lack
> > > thereof) of the process going on here.
> >
> > The data gets usually gets stored digitally onto tape (although
> > some camcorders use other forms of storage). I recommend miniDV
> > rather than digital-8 (or whatever they call it).
> >
> > The issue is when you download to the computer, and the time it
> > takes. If you are trying to monitor the video on your computer
> > in real time, as you can do with cswing, you will drop frames
> > if you don't have enough bandwidth - either in the connection
> > or in the computer.
> >
> > USB used to be about 10X slower than Firewire, so that is why
> > everyone says to get Firewire for video. However, USB2 is now
> > roughly comparable to Firewire in terms of bandwidth. Either
> > is sufficient to handle digital video.
> >
> > Capture is like you say, just downloading from the camcorder
> > to the computer and creating a video file usually in .avi
> > format. Avi file are uncompressed, so they are large,
> > but they have noticeably better detail and resolution
> > than compressed forms like .mpg or .wmv, etc.
> >
> > Hope this helps some.
>
> I didn't explain that quite fully. The issue
> is, when the camcorder dumps the digital data to the computer,
> it does so at the real time frame rate. It has to do that
> if it is feeding a TV monitor, etc. , and the tape transport
> inside the camcorder runs at that rate (it doesn't start
> and stop as the data goes out). If the interface or
> computer is too slow, frames will be dropped. But it
> should be no problem using either firewire or USB2.
>
> However, you need a decent computer to keep up!
>
.
- References:
- Camcorder/GolfSwing Technology Question
- From: Dave Lee
- Re: Camcorder/GolfSwing Technology Question
- From: Birdie Bill
- Re: Camcorder/GolfSwing Technology Question
- From: Birdie Bill
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