Downconvert/Field Issues-Upper vs Lower?

[Gary Adcock]

[John Pale] “Gary, I see this too on with my Kona 2 on a CRT broadcast monitor.
I dont think what’s going on is what you think it is. It may not be affecting everyone, but it is real.”

Thats interesting John,
in my testing the ghosting results were not seen on a CRT or my scopes (were it should show up), just on the uprezed output signal the plasma.

So I have been dissecting this from a differing point of view since I do not see the ‘ghosting’ on any of my output tests — expect when the display itself is converting interlaced fields to frames like plasmas do. (plasma display technology uses an internal conversion that line doubles the interlaced fields to convert it to a progressive output)

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows

[Kevin Wild]

Gary, I sent you a picture to your site email (info@…) so you can see what we’re talking about and again, what AJA has admitted is a bug. This was taken from 37″ LCD monitor. I have others that look even worse from a 42″ and 50″. It is a problem with the downconvert…

Kevin

[John Pale]

[gary adcock] “Thats interesting John,
in my testing the ghosting results were not seen on a CRT or my scopes (were it should show up), just on the uprezed output signal the plasma. “

I worked on a Kona 3 system today at a different facility and did NOT see it on their CRT. The bug may be limited to certain board revisions or hardware combinations. Should be a piece of cake to troubleshoot this 🙂

[Gary Adcock]

[John Pale] “I worked on a Kona 3 system today at a different facility and did NOT see it on their CRT. The bug may be limited to certain board revisions or hardware combinations. Should be a piece of cake to troubleshoot this :)”

OK
so all of us are right… now lets see what’s different.

I am on the most current versions of everything,
running on 3 Quad intels and a Dual 2.5 PCI-x

So that means
OS 10.4.10 / QT 7.2 / FCP 6.01 / Kona Build v4 (on all 4 machines)

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows

[Alexander Serpico]

Just to add my experience, when downconverting either through the kona card or in FCP (ie. anamorphic to letterboxed 4×3), i always get a soft line doubled ghosted image also. I too have not yet figured a way around this. From my point of view this is not exactly a field issue, more of an interlacing issue (splitting hairs maybe). Trying to down convert with shake, just opens another pandora’s box of frame resizing issues due to interlacing. I assume the trade off of in having the kona card or fcp software do this conversion so quickly is the ghosting, verses shake or compressor (in its default or most basic of settings for conversion) getting the horizontal ripping. I would love to pin point a solid way of doing this, and i admit to not spending enough time trying to solve this issue with tweaked settings in shake or compressor. also i have not tried to do this in the latest version of fcp, which i heard has better resizing (or maybe i just hope that is the case).

[John Pale]

[gary adcock] “I am on the most current versions of everything,
running on 3 Quad intels and a Dual 2.5 PCI-x

So that means
OS 10.4.10 / QT 7.2 / FCP 6.01 / Kona Build v4 (on all 4 machines)”

MacOSX 10.4.10/QT 7.2/FCP 6.0.1/Kona v4
PowerMac G5 Dual 2ghz/Kona 2

[Tom Brooks]

Sounds like a field flip issue to me. I had an SD experience with that look a day or two ago. A colleague had an uncompressed sequence (720×486) with some DV (720×480) clips on it (He should have made a DV sequence). I changed the sequence setting to DV. It looked horrible. I looked at the motion tab on the clips and found that they were all set on “1” in the Y position instead of 0. Moved them back to 0–bingo, looks good again. Any chance you are getting a field flip because of incorrect Y position of the material?

[John Pale]

No. I did try to shift the fields and it did not help.

Anyway, I know what a field shift looks like and this is different looking.
Unfortunately I cant think of an effective way to post a screen shot.

[Tom Brooks]

I did the quick title test and I see what you’re talking about on the downconvert.

FCP 5.1.4, QT7.2, Kona LHe, Kona Control Panel V3.4