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Green artifacts around Alpha channel in FCP 5.0.x?
Has anyone here run into problems with FCP5 rendering green, “speckle”-type artifacts around overlaid graphics?
Yesterday, while in a client-supervised finishing session, I dropped a logo (a single-layer PSD file) over a clip, and although it looked fine before I rendered the composite, AFTER I rendered it, wierd green artifacts appeared around portions of the edges of the graphic. Something wierd is obviously happening during the rendering process, since these artifacts don’t appear when the playhead is stopped or scrubbing through the clips BEFORE it gets rendered. I tried saving the PSD out as PICT and TGA with alpha, and the problem still persists.
The artifacts are visible both in the Canvas as well as the NTSC output.
After spending some time troubleshooting, I finally discovered that if the “Motion Filtering Quality” setting for the sequence is set to anything other than “Fastest”, the artifacts always pop up. The only way around this problem is to set the Motion Filtering to “Fastest”, but obviously you compromise the render quality of any other motion effect in the sequence, which needless to say really sucks.
Can anyone here duplicate this problem? I’ll probably submit a bugreport to Apple, but I’m curious if anyone else has run into this.
BTW, my system config:
Dual 2.7 GHz G5
OSX 10.4.3
FCP 5.0.4
Blackmagic Decklink Pro (v5.4 drivers)
Editing with SD, uncompressed 10-bit footage. -
3 Replies
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I’v run into some video plugins can cause green anomalies but not just a Photoshop file.
Hope this helps-
Matthew
Dual 500 G4
OSX 10.3.9
Ram 1.38
FCP 4.5/AE 6.5/DVDSP3 -
I’ve had this problem with tiff files and certain plug ins.
The way I get rid of it is to not render at 10 bit.
Do it at 8 bit and you don’t get any greenies.
Go to sequence settings, video processing, render in 8 bit YUV.
You can now render those motion effects at best quality.
But if you have complicated color effects you may see
some slight banding. But for me I have not had that problem.
I still do all the editing in 10 bit uncompressed,
but if I get one of these greenie problems for an effect,
I’ll just change the render setting to 8 bit and they go away.I’m thinking this is a codec problem. I use Aurora Pipe Studio
and Aurora codecs, but you say you use Blackmagic?
So maybe they both have this problem. I wonder if AJA people
see this too?Dan
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This is an FCP/Quicktime 10 bit problem, it happens with AJA hardware as well. It’s been around for a while.
Joe Murray
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