Posted by Martin Heffels on 01/12/72 11:52

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.

>> 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. 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.

>
>>
>>> 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.

cheers

-martin-
--
"If he can he'll smile 'cos he's a Royal Crocodile."

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