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Color change at beginning of video transition
Doing some editing in FCP and still relatively new to the program. I have a source file that uses the AIC codec and I am trying to use a wipe transition, but getting a weird color change error right when the transition starts. I’m using a clock wipe at the moment and on the very first frame, the color shifts to a more blue color as if there were a color correcter adding a blue tint (and I can assure you there isn’t). This all happens with the transition on its default settings.
It appears normal before I render the section with the transition, but as soon as it’s rendered the error is present. I thought it was maybe just an FCP display issue so I exported a video file but sure enough the error is present in the file as well.
Does anybody have any ideas on what could be causing this and how to rectify the issue? Thank you.
Michael
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6 Replies
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Hi Michael,
Not sure if is this the issue, but in FC remains some 8b RGB effects and transitions.
When you apply them on any YUV sequence, the shift in color space while the transition is unavoidable.
A solution could be rendering the sequence in RGB, but not sure here is an option on FCE.
rafael -
Thanks for the reply Rafael. I’ve changed the sequence to always render in RGB in the Video Processing options and that seems to fix the issue. My question now is, how will this affect the overall output? As mentioned, I’m using source files with the Apple Intermediate Codec which I’m guessing is a YUV based codec based on the fact that the sequence settings defaulted to that when I imported the first clip. So when I render the entire thing as RGB, will that have any negative affects on the output? Thanks.
Michael
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One question I have is do you have to edit in the AIC codec? That’s a pretty old, clunky codec that’s not really all that great for editing when you have much better codecs like ProRes at your disposal. You won’t have any weirdness with transitions and filters.
Walter Biscardi, Jr.
Editor, Colorist, Director, Writer, Consultant, Author, Chef.
HD Post and Production
Biscardi Creative Media“Foul Water, Fiery Serpent” Winner, Best Documentary, LA Reel Film Festival.
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Hi Michael,
I haven’t paid attention to the AIC codec.
Walter is very right. Rendering to a better codec you will avoid further compression.[Michael MacInnis] ” My question now is, how will this affect the overall output? As mentioned, I’m using source files with the Apple Intermediate Codec which I’m guessing is a YUV based codec based on the fact that the sequence settings defaulted to that when I imported the first clip. So when I render the entire thing as RGB, will that have any negative affects on the output?”
When you change color space (YUV to RGB or RGB to YUV), there are unavoidable changes.
Negative effects? You will have to compare both pictures (YUV and RGB rendered) to see if the RGB rendering is screwing colors or Gamma.Michael I suggest you a more elegant and professional way to resolve the issue (render everything in RGB just to fix this, is a cheap trick).
Build your self that transition using a B&W Matte. is very easy:
– Open a new sequence with the same setting than your actual time-line.
– Put a solid Black in Video Track 1 and solid White in Video Track 2.
– Apply your wipe to go from Track 1 to Track 2 (Leave some black head and white tail).
You will end up with a clip that changes from Black to White through your wipe.
Now you can use that clip as a Travel Matte Luma on your original time-line.
FC will render this in YUV (even 10b if needed) and you will get rid of that annoying Gamma shift.
rafael
PS: If you don’t know how to apply the Travel Matte, you are lucky to have those resources:
https://library.creativecow.net/articles/biscardi_walter/FCPTravelMat1.php -
I will give that a try, thank you.
In regards to rendering with a different codec, is it possible for me to maintain all my cuts in FCP and simply swap the footage with the newly rendered source? For example, the original source is DVD and has been converted to AIC using MPEG Streamclip. If I were to create a new .MOV file with a different codec, can I simply swap that with the .MOV file in FCP to maintain all my cuts? The files would be the exact same length and frame count, just different codecs.
Also, what would be the best codec and settings to use to maintain the quality of the DVD source?
Thanks.
Michael
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Hi Michael,
I’ve never worked with FCE, but I guess that you can import any QT movie.
The application is limited to RENDER and EXPORT AIC, but i think shouldn’t be any problem importing any other kind of QT Movie.
Not sure; I’ve never worked with FCE.
Avoiding the pre-conversion to AIC, you would skip one generation lost and work on the original stuff.
Much better of course.
rafael
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