Can huge exported ProRes 4444 alpha channel files be smaller?

I am exporting 3D 30 fps sequences to MOV files using the ProRes 4444 codec and alpha channel (transparency).

These files are huge (close to 1 Gb for a 20 s timeline), and their quality is good.


The trouble is, since I need to export quite a few of similar files, disk space starts to be a worry.

Hence my question.


Is there a way to reduce the size of the exported files without losing in quality? Changing the codec? Something else? Lowering the fps is not an alternative.


Experimenting is quite a burden since almost every export takes about 20-30 min. When laziness speaks…

Motion 5.9

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Br,

Mac mini

Posted on Apr 17, 2025 12:11 AM

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Apr 17, 2025 6:57 AM in response to claude_210

What is the frame size? If you are doing at 4K, and you can work in 1080p instead, that would reduce the file size significantly. Anyway, ProRes 4444 files will always be very big.


You should get yourself one or more external drives if you haven't already. An external 1TB SSD is not expensive nowadays.

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Apr 17, 2025 8:38 AM in response to claude_210

My method is to Save the project as a Generator and finish it in Final Cut where exports can be H.264 or whatever more compressed export you prefer. A Generator gives you the best quality in Final Cut regardless and the memory cost is usually less than 1Mb.

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Apr 18, 2025 9:49 AM in response to claude_210

You should (almost) never need to export video elements from Motion. The idea of Motion is to create whatever *toolkit* you need to edit what you want in Final Cut (easier said than done sometimes...). BTW, when you Save a Motion project *with* video, that video file is copied into the Media resources folder for that project no matter what (there is no Keep files in place option for this.)


In general, use whatever video you need to help you render your Motion graphics. Then delete the video, Save the Generator/Template. Use the video in Final Cut and add the generator. The generator should have all the parameters published that you need to use for your "variations" — you don't really want to build "one-trick" generators for each FC project.


Final Cut is much more proficient at rendering than Motion is, again, in general. All I know about this one is that you need some kind of Alpha with the video. Masking operations in Final Cut are far more powerful than in Motion and if you need masking for your Motion objects, then consider creating Effect projects instead. All Effects have access to Color and Shape Masks [as many as you need] and from what I understand, the new Magnetic masks.


Without specific details of the project you have in mind, it's really hard to offer better advice.



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Apr 17, 2025 11:29 PM in response to fox_m

I see. I suppose I could create "Motion Templates PROJ X" directories (along with Generators subdir) specific to each of my projects and rename them accordingly so that FCP read them in at startup. I am just wondering about how practical this is. Some of my MOV files take 30 min to be generated by Motion. I would hate this to happen in the middle of my editing in FCP. Of course, if the matter is a smaller file, the computing time would be smaller....


I should try. Or think of some other solution... Tx and have a nice Easter!

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Apr 29, 2025 12:37 PM in response to fox_m

fox_m wrote:

You should (almost) never need to export video elements from Motion. The idea of Motion is to create whatever *toolkit* you need to edit what you want in Final Cut (easier said than done sometimes...). BTW, when you Save a Motion project *with* video, that video file is copied into the Media resources folder for that project no matter what (there is no Keep files in place option for this.)

I am sorry I reply that late, as I was a bit busy... But I thought I should just do it in order to see if I understood -or not, what you mean.


I know that Motion was primarily intended to be some sort of a helper program to FCP. Hence the "effect", "generator", "transition" and "title" projects which are specifically intended to FCP. But... Motion evolved IMO and can perfectly be used nowadays as a separate complex video clips generator usable by any editor, FCP included. In particular, the evolution of 3D rendering in Motion makes possible to design intricate videos not directly adapted to these effect/generator/transition/title interfaces to FCP. Tell me if I am wrong.


This is my case. I have been recently designing numerous (10s-30s) and quite long (20 s) full 3D scenes used as an input to any video editor, FCP included of course. I have no idea how practical that would be to use for example the Generator interface for that purpose. I am not sure, but I feel this would be clumsy and add to complexity in Motion. I may be wrong, as I never -not yet, tried. I know I should... In particular, I thought very interesting the camera paths possibilities in Motion, which can bring thrilling possibilities. How would that be reusable in FCP through the generator interface?


BTW, I very rarely make use of video import to Motion, just as one-off use templates to scale Motion objects maybe...


In general, use whatever video you need to help you render your Motion graphics. Then delete the video, Save the Generator/Template. Use the video in Final Cut and add the generator. The generator should have all the parameters published that you need to use for your "variations" — you don't really want to build "one-trick" generators for each FC project.

Final Cut is much more proficient at rendering than Motion is, again, in general. All I know about this one is that you need some kind of Alpha with the video. Masking operations in Final Cut are far more powerful than in Motion and if you need masking for your Motion objects, then consider creating Effect projects instead. All Effects have access to Color and Shape Masks [as many as you need] and from what I understand, the new Magnetic masks.

This is point which is worrying me and that I experienced. Motion videos can be quite bad, sorry to say. The video quality AI learning in particular makes me doubt of Motion rendering top quality. But I have been using it for only a few years, that means, I am still -unfortunately, a beginner.


Without specific details of the project you have in mind, it's really hard to offer better advice.

I may show you my project, at least the final video, which I just got ready in YT. Then, you'll certainly understand what I have in mind. Tx again for your time, Fox!

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Apr 30, 2025 2:13 AM in response to claude_210

If all you want out is a video to be used as is, then exporting as a video, like you are doing, is fine.


A generator in FCP is a lot more flexible than that.

Not onle you can use it as is, but you can also publish multiple parameters that you can then tweak inside FCP. Also, generators can be stretched in time, so you can easily, for example, have an intro that lasts two seconds, an outro that lasts one second, and the middle section can automatically stretch depending on the duration on the FCP timeline. You can include Drop Zones that can be filled with different content from FCP at the time of editing.

Instead of a finished video, a generator is an (aptly named) template of something that is realizable in different ways within FCP.

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Can huge exported ProRes 4444 alpha channel files be smaller?

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