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Posted by mmaker@my-deja.com on 10/05/82 11:52
ptravel@travelersvideo.com wrote:
> Simply saying so doesn't make it so.
Look, you can claim all you like the data dropouts don't happen on DV,
but some of us have been working with DV for the best part of a decade,
and have seen plenty of them. Which are we supposed to believe: your
claims or our experience?
> > > In the
> > > 200-300 hours of digital video that I've shot, I've never had a single
> > > instance of drop-out -- not one.
> > Really? Your deck actually tells you when it gets an uncorrectable
> > error?
> No -- drop out is obvious when it occurs.
How? The only obvious dropouts are when a) the dropout is in the audio
track, where the DV deck can't mask it and drops in a frame of silence
instead or b) when there's too much motion in the frame for it to hide
the dropout by replacing a video block with the same block from the
previous frame. Otherwise you won't notice dropouts when they occur,
but you've still lost data from the original file.
> > Or are you just guessing you've never had a dropout because you've
> > never noticed it?
> See above.
Where you said nothing useful.
> I think you'd be surprised by the result.
No I wouldn't, because I know what the result would be.
> I have no intention of
> wasting that kind of time.
Good for you. But if you're not willing to actually do the tests to
determine the level of dropouts, no-one should be expected to believe
you when you claim they're 'extremely rare'.
> Nonetheless, drop out is not the same
> thing as generational loss.
No-one ever said it was.
> So what? How often is a hard drive read, versus tape? The recording
> density is far greater for hard drives than tape.
How is that even remotely relevant?
A hard disk is reliable because it's designed to pretty much guarantee
reliable storage of data: if it gets a single random error it can read
the block again and hopefully get the correct data the second time, and
if it continually gets errors on the same block it can move the data
elsewhere. A tape can't do anything like that, if a section of tape is
bad, you're going to get dropouts because there's nowhere else for the
camera to write the data and it can't go back and try to read the tape
a second time.
> DV cameras don't replace drop-out with anything,
Yes they do... you merely need to look at the playback of a section of
tape with serious dropouts to see exactly what the camera is doing.
Again, you're just proving that you don't know what you're talking
about.
Mark
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