Bizarre glitching in FCP Part Deux

[Aaron Neitz]

What are version numbers: FCP? QT? Are you using hardware like Aja or Blackmagic?

I’ve had glitchy renders, but I’ve never seen this.

[Aaron Neitz]

…wait, when you say you have to “render” the footage – do you have effects? That is, when it’s on the timeline are you getting a green preview line or anything?

[Aaronjohnson]

I’m not at the client’s office right now so I can’t check out the FCP version, but I think it’s the latest version. Same with QT. There are no filters or effect… The glitching occurs when dragging the video straight onto the timeline. I’ve compared the properties of the timeline to the properties of the video and EVERYTHING matches up. ENIGMA!

[Todd Beabout]

Just wanting to clarify… In your original post you said:

“When we put it on the timeline, the preview looks/plays fine. Then when we RENDER it has glitches like this during periods of motion”

But in this post you then say:

[AaronJohnson] “There are no filters or effect… The glitching occurs when dragging the video straight onto the timeline.”

This sounds contradictory. Are you sure there is not some specific filter that you might have applied? Because if your sequence and source clip settings all match you should not have to render obviously.

When you get back to the FCP box, also check to see what you are using to capture (i.e. AJA, Blackmagic, etc.) like Charlie asked. This could help troubleshoot the problem. Also, and just asking here… you didn’t try to add another pulldown or anything like that did you?

-Todd Beabout
Vazda Studios

[Aaronjohnson]

Hey, thanks for everything thus far…

I’m positive there are no filters or effects. When I say it looks fine before we render, I mean, it looks fine in draft mode. It does have a red bar, however, exactly like it would if there were a filter or effect – but I assure you, we haven’t applied any filter or effects! I messed with pulldown to see if it had anything to do with it and it doesn’t seem to help, but to answer your question – no, no pulldown.

So essentially, in short… When you lay it down in the timeline, it looks fine, but it’s in draft mode and there is a red bar. When you render it, it takes an unusually long amount of time and then the glitching occurs. So, it would seem to me like there is some sort of conversion/filtering going on but I can’t for the life of me figure out where it’s happening. One odd thing… The source video says it’s 486×720 instead of the usual 480×720, but it also says it’s regular ol’ NTSC DVCPRO/25. I have a feeling this might have something to do with it, but i can’t seem to change the timeline to 486×720 for love nor money and I don’t even know if that would help.

Gasp.

-Aaron

[Dan Nocera]

Did the transfer house give you the the transfered footage dv on tapes or did you get it on a hard drive as quicktime files?

DV footage should always be 720X480. You said it was listed in a browser as 720X486 which is the size for CCIR 601 uncompressed video.

It sounds like it was captured wrong with the wrong preset.
If that was the case just throw out and recapture using DV NTSC preset

It’s also why you have to render everytime you pull it into a dv sequence.

Try opening one of the clips in quicktim and get info and then get properties and see what it says.
What is the frame rate listed as?
See what it says especially under format.

If it says DV/DVCPRO – NTSC, 720 x 480, Millions under format
and 29.97 for FPS
and 720X486 pixels under normal size (wrong size)

Try going into properties ->video track->visual settings and uncheck preserve aspect box and change scale size to 720X480
then save a self contained copy of the footage, import new footage and see if that fixes the glitching problem

Dan Nocera
CTFCPUG Moderator

If all else fails give it a whack!!
-Anonymous Techie

[Aaronjohnson]

I’ll check all of that out tonight when I go to the client’s office again. For what it’s worth, we never captured anything – it was given to us on a hard drive.