Re: "USB video"

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,

http://www.linux-usb.org/

> Your page at SF describes 1394 as a protocol, so I'm
> not really sure if it is specific to the firewire
> hardware, or if the USB transmission would be the same
> from the software side.

Video data transmission over the 1394 port works probably as
isochronous transmission (data rate guaranteed, data integrity
not guaranteed). Several different video formats can be streamed
by means of isochronous transmissions. Furtheremore, different
high-level protocols for the control of video devices over 1394
exist (start, stop commands etc. by means of asynchronous
transmissions).

I never heard of ischronous transmissions over USB. I guess they
use a proprietary protocol. Some still image devices simply work
as standard USB storage device class though.

-- 
Stefan Richter
-=====-=-=-- -=-- ==-=-
http://arcgraph.de/sr/
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