Re: Best way to backup DV tape?

On Tue, 12 Jul 2005 15:25:20 -0700, "Richard Crowley"
<richard.7.crowley@xxxxxxxxx> wrote:

>"Owamanga" wrote ...
>> Detection and correction are done at many levels,
>> the application layer is only one of them. Firewire
>> is missing it at the transport layer, Ethernet and USB
>> are not. That feature was simply missing from the
>> IEEE standards.
>
>As it was a more modern standard, and since the computing/
>communication landscpe has changed since Ethernet (and
>USB) was invented, leaving it up to the application layer
>seems pretty smart to me.

Blame it on what you want, even the application layer in this case
*fails* to provide the capability to recover from a dropped frame. Of
course the entire frame wouldn't have had to be dropped if the small
error within it was corrected by the transport layer in the first
place.

>> I'm just saying that the argument "It doesn't need/can't have
>> error correction because its 'VIDEO" is bogus.
>
>But thats not what we are saying. Were saying that because it
>is "TAPE" (or live camera) it must be processed in real-time
>with no opportunity to to back and request re-transmission, etc.

Okay, "TAPE" is the key now is it?. Still bogus. DAT tape drives are
TAPE systems yet they provide hamming codes and other methods to
*RECONSTRUCT* missing data. THIS IS NOT AN EXCUSE.

There is *no* good excuse.

The data can come from live source, tape, disk, flash memory or little
pieces of damp string, it makes no difference. A simple buffer in the
sending unit (eg DV camera), say 5 frames big (>800kbytes) would allow
for a retransmission of any frame that failed to arrive intact.

They simply didn't bother.

For live transmission, the impact of a 5 frame buffer delay between
the action and when it arrives at the other end equates to 0.2
seconds, hardly a big cost for assuring quality don't you think?

--
Owamanga!
http://www.pbase.com/owamanga
.

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