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Posted by ptravel on 10/05/07 11:52
Martin Heffels wrote:
> On Sun, 09 Jul 2006 21:58:21 GMT, "PTravel" <ptravel@travelersvideo.com>
> wrote:
>
> >Bits don't get corrupted during a firewire transfer,
>
> Long firewire cable + earthing problems :-)
>
> >There is no generation loss when copying digital video.
>
> Correct. Except from tape-to-tape, where there is a slight possibility.
Absolutely not. There is a slight possibility of data drop out, as
there is with any digital storage medium (and that possiblity is
extremely rare). There is, however, no generational loss.
>
> >> Doubt it. I do remember one test involving multiple generations of
> >> recompression of DV footage which claimed degradation after about 18
> >> generations, but you shouldn't see serious issues when making digital
> >> copies. You're likely to have the odd dropout on the tape, but
> >> otherwise the general quality should be fine.
> >
> >You're correct that the there will be no generation loss. However, drop-out
> >from digital video tape is very, very rare.
>
> Not correct. This solely depends on the quality of the codecs used.
Look up the meaning of drop out. It has nothing to do with codecs.
> And
> then it can quickly add up. The standard MS-codec is still of lower
> quality, and won't keep up with those 18 generations at all.
Absolute nonsense. You can dupe a D-25 tape 18 times and the 18th copy
will be identical to the first.
>
> >
> >>
> >>> When I copy a file in my computer even a hundred times, it should
> >>> be exactly the same.
> >>
> >> But hard disks are far less prone to bit errors than tape: for one
> >> thing they can detect faulty disk blocks and move the data elsewhere...
> >> you can't do that with tape. On the other hand, the lifespan of a hard
> >> disk is typically far less than that of a tape.
> >
> >Both hard drives and digital tape employ error correction, which is one of
> >the reasons why drop-out is so rare for digital video tape.
>
> But both are different.
Yeah -- one is tape, one isn't. However, the statement stands: error
correction is used for both media, and the chances of drop out are
miniscule on either.
>
> cheers
>
> -martin-
> --
> "If he can he'll smile 'cos he's a Royal Crocodile."
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