Posted by PTravel on 01/12/57 11:52

"PTravel" <ptravel@ruyitang.com> wrote in message
news:4hg0ejF1rh144U1@individual.net...
>
> "Richard Crowley" <richard.7.crowley@intel.com> wrote in message
> news:e8ueph$9p9$1@news01.intel.com...
>> "PTravel" wrote ...
>>> Can you site me to something that says how often this happens? I've
>>> never heard of DV video transfers being described as anything other than
>>> lossless.
>>
>> There are some CD players and DAT recorders which display
>> the raw error rates while playing. I know that everyone who has
>> seen those numbers are astounded by them.
>
> Well, yes, but that's not what I'm asking for, i.e. a source for the
> number of uncorrectable errors that result in video data being "filled in"
> by extrapolation.
>
>>
>>> I meant that the resulting data is not the same as the original, hence
>>> there is data lost. But how often does this happen?
>>
>> It typically happens several times per second for your average
>> audio CD. I'd bet that it is roughly equivalent for DAT and DV
>> tape.
>
> Sorry, but that's not what I'm asking. The contention here is that there
> is generational loss in straight copies of digital video data, and I've
> never heard that anywhere else. For generational loss to occur, there
> have to be gross drop out errors that can be fixed by conventional ECC
> and, per you and Martin, are fixed by extrapolating based on prior or
> subsequent video data, i.e. pixels are filled in. I'll take your word
> that happens, but I don't believe it happens often enough to be a concern.
> I'd like to see some data that suggests that, notwithstanding every source
> I've ever seen that says digital video dupes are lossless, this isn't so
> (see the quote from Adobe in a post I made to Martin).
>

More sloppy typing by me -- that should read "gross drop out errors that
CAN'T be fixed by conventional ECC . . . "

Sorry.


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