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Posted by Giraud on 01/06/07 20:26
Richard Crowley wrote:
> I'll buy it from you if you don't want to get it fixed.
> But I'm assuming that you are aware that model is
> considered one of the best small-form DV cameras
> Sony ever offered. :-)
Well, I'm not sure you'd want it. Along with the dropouts, it has
always had an issue in which the right side of the image has shimmering
vertical lines of dots for the first few seconds after turning it on
(Sony never found the issue, but it is so temporary, it's hard to
reproduce). Also, it now will not charge the battery (we have to use an
external charger), and I am not sure if the A/C adapter effectively
provides power...
But I'll ask my wife! :)
>> I started by comparing the AVI files ...
>
> You must have "normalized" the video files so that
> you were looking at the same sequence of frames,
> etc. Or else you would have got an infinite number
> of "differences". Can you tell us how you did that?
> That seems to be one of the major roadblocks to
> doing the kind of analysis that you performed.
Well, what I did was simply to use WinDV and check the box that
separates the images into clips by a timecode threshold (I use 1
second). This automatically produced frame-perfect breaks in all but
the first clip on the tape (I do not include the first clip in my
comparrison).
> Remember that with pro equipment, there is provision
> for actually making bit perfect copies ("clones") where
> the digital stream itself is transfered from the playback
> to the record machine. Certainly no dubbing that involves
> baseband/composite, Y/C or component "video" could be
> "bit-perfect" as it passes from D->A and then A->D again.
Even though the camera I was using is not pro, doesn't the same apply,
since I was using FireWire? I do know that, by far, *most* bits were
identical. It's just that the number of uncorrectable errors were more
then I expected, for sure!
>> If anyone wants to look at the images I saved, let me
>> know, and I could put them up on a site.
>
> Might be instructive for the non-believers. :-)
OK, here's a page I put together. Let me know what you think:
http://www.skyrush.com/video/minidv_errors/
> Thank you very much for both the research and the
> reporting here. You have made a very significant
> contribution to the information shared here in this
> newsgroup. Kudos! :-))
Hey, no problem! It's cool if my experiment helps!
-Giraud
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