Re: "USB video"

On Mon, 2004-04-26 at 16:54, Terry Hancock wrote:
> On Monday 26 April 2004 02:28 pm, Stefan Richter wrote:
> > On 24 Apr, Terry Hancock wrote:
> > > Please, pardon my ignorance...
> > >
> > > I have a Panasonic "Palmcorder" (PV-DC252D) camera. It
> > > is apparently able to store video in DV format on a
> > > *tape*, and play it back via digital ports. One of these
> > > is (I think) firewire and the other is a USB.
> > >
> > > Is it possible to play the video back via USB onto a
> > > Linux computer,

No, not the high quality DV video for which you purchased the
camera--regardless of platform.

> Hmm. Well, it could be that I misunderstood the manual. Maybe the
> USB will only work to get still images. I guess the logical course

Correct, the USB basically provides storage-like access to the digital
camera half of your camera. Many of these cameras can record short, low
res or low frame-rate mpeg-4 (or similar) video onto the flash memory.
It seems like a silly feature, but it is one more item for the feature
list while confusing many consumers.

> of action would be to actually get a 1394 card for this computer.
> It doesn't look like they're that expensive nowadays.
>
> Assuming that I do that, I suppose it's reasonable to use that
> to download the DV files. I'm a little concerned about this "isochronous"
> concept -- sounds like I might lose data in the process. I mean, I
> was under the impression that the DV data was uncompressed, so it

DV is a form of compression, but its not that heavy. So, you will get
nice, big easily editable files that have very good support for editing
on many platforms. :-) Don't worry about the technical bits of
isochronous because you have no choice. While it is possible to lose
packets, it is typically rare, and capture software usually detects and
warns you.

> ought to be possible to get it intact. I guess this means I need
> to be concerned about the throughput of the 1394 port. Do they
> vary, or is it just a case of "Firewire is firewire"?

For the most part, the answer is yes.

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