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Problem with FCP/alpha channel…
I’m working on a project using footage shot in DVCPro50 and adding a logo with an alpha channel (animation).
The layer with the alpha channel does not move at all and has no effects applied to it.Everything looks great on the monitor but when I export it or “print to video” the logo seems to undo itself in some areas as it moves.
The original footage is pristine and the logo with alpha is perfect too.
We did the same exercise in 3 different machines carrying 3 different brand video cards (different versions of both FCP and QT too) and the results were very similar.
I dumped both FCP’s and QT’s preferences.
I tried exporting the exact same secuence from AE and it shows no problems at all.
I ended up recording directly from the timeline
Any clues?
Thanks in advance,
E.C.
Here’s a sample of the “deffect”:
https://www.eduardochacon.com/uploads/dissolve.jpg -
17 Replies
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I’m sorry but that I cannot tell what that picture even is.
Have you rendered everything, even full rt effects? Is your alpha channel set properly (straight, white or black)?
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Yes, everything was rendered and tests with straight, black and white settings for the alpha gave bad results.
We tested in both 8 and 10 bit and in several different codecs with same or very similar results.Here’s another frame of the render:
https://www.eduardochacon.com/uploads/flaw.jpg
At it’s center it should be transparent but there are many “missing” pixels on the logo.
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Where’d you get this graphic from?
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it was created in a 3D program.
I’ve ben using this graphic for over 3 years now and still today it has no problem in other programs than FCP.
The problem also occurs with any moving graphic with an alpha channel. I created out of a PS logo and gave it some movement in FCP and when I tried to render I got the exact same weird results. -
Did you check your sequence’s render format and RGB/YUV settings, and make sure the graphic’s color mode is compatable?
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I really don’t know what to say as I don’t get these problems. The only thing I can think of is that the graphic is in a format that FCP does not like.
rcPics might be on to something. If the photoshop graphic is CMYK, FCP might not like it. As far as the 3D thing, that’s probably in RGB and FCP should accept that file. Maybe it’s time to re-render a new one?
Jeremy
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Hi Jeremy,
the file has been re-rendered in after effects and re-imported to FCP with the same crappy results.Not only that, I created another graphic in PS and gave it some motion and there was the problem again.
As I said before this happens in 4 different machines using different versions of both FCP and QT and also AJA, Decklink and CineWave cards.
I’m trying to schedule a meeting with several FCP pro’s here in SoFla to see if any one has any idea of the problem.
See, until now I’ve been using AE to post produce all my commercials. Only recently I decided to get a Ciprico 320R to save some time with FCP’s real-time features but this “flaw” happened.
It’s hard to believe that FCP wouldn’t be able to handle a moving logo with alpha, so there’s got to be something going on.
Thanks. -
[jarane] “It’s hard to believe that FCP wouldn’t be able to handle a moving logo with alpha, so there’s got to be something going on.”
It most definitely can. There’s no chance you can post the real logo can you? Or perhpas a portion of it? Without being able to see it, it’s hard for me to help.
How did you render out of AE, that is, what are your settings?
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Where are you located?
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AE render settings: animation millions of colors, the sequence was created by dropping the footge on the composition icon so there shouldn’t be any discrepancies.
Here a screen shot of the results Iv’e been getting with the different instances of the logo renders.
The one in the lower left is the PS logo I told you about… this one is about 15 inches wide at 300 dpi (completely different from the animation logo which is a 720×486 QT movie), and still we get the weird result.
The link to the screenshot:https://www.eduardochacon.com/uploads/alphaproblem.jpg
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