Final cut pro freezes system when rendering

There have been some reports of problems with third party plugins, and some people have written that they seem to be solved in the latest beta of 10.14.4. Just passing it along, as I cannot test this.

I have similar case. Mac mini 2018/8 GB/3GHz Intel Core i5/OSX Mojave 10.14.3, newest updates for OSX and FCPX.

Found out that PixelFilm Studios Horror LUT plugin is the issue for me. Removed the plugin (eg. moved it to trash from Motion Templates), restarted FCPX, selected another LUT with mLut plugin and rendering with LUT goes in 1 minute for 1 minute clip.

When I remove mLut LUT from video and use PxelFilm Studios Horror LUT and export video it takes about 4 hours to export the one minute clip, might take even more.

One thing I have noticed is that when I open Activity Monitor and select from Window-menu to see GPU and CPU usage in small windows and start video export both CPU and GPU is very well used when I have mLut + external LUT files in use and it is fast as it should be.

When I select Horror LUT instead my GPU is barely used and CPU is not used either. Still the whole system is almost unresponsive. For example when I tried to take screenshot it took minute or more until I got the region handles where I can select what area I want to screenshot to. I finally take photo with my cellphone about this strange behavior.

With PixelFilm studios Horror LUT it looks like this (photo above). This was in the middle of rendering when it was around 7 %. First 5 % had no any kind of LUT's so first five seconds went in couple of seconds.

With mLut + Triune Color Horror LUT it looks like this (photo below). In this time it has already done big part of rendering. GPU and CPU is both used very well and system is not unresponsive at all.

Anyway I have contacted to Pixel Film Studios for technical support about this so let's hope they will find a reason for this. Would be nice to use that plugin since there is nice LUT's for my usage. :)

Everyone,

We’ve noticed that more and more people are complaining about these freezes in FCPX while using 3rd party plugins on machines running latest 10.14.3 version of macOS Mojave.

We were able to replicate this issue spending dozens of hours on our end and this issue is not caused by any third-party software/plugins. The same freezes can be replicated using Final Cut’s built-in titles and effects (4K project, one clip in H264 format + lower3rd above and Gaussian Blur effect applied to the Lower 3rd) so it’s most likely a bug in the recent MacOS update.

It only occurs on machines with an integrated Intel Iris Plus 5XX or 6XX series GPU (without a discrete Radeon or any external GPU) so a faulty update for the Intel Graphics drivers would be our best bet.

We are just finishing the Bug Reporter file, which will soon be sent to Apple. We advise you to do the same (macOS 10.14.4 is around the corner so they don’t have too much time to fix this).

Please fill submit your issue directly to Apple yourself - they do read all of them! https://www.apple.com/feedback/finalcutpro.html

Szymon Masiak

MotionVFX.com

Hello

Same issue for me, rendering H264 4K computer version on a Mac Mini late 2014 iris graphic board - 10.14.3 , FCPX 10.4.5 no plugins.

Same issue on a 2nd Mac Mini with same config / OSX & FPCX

No issue on a Macbook pro OSX 10.14 (same project)

I also notice some issues with GoPro Fusion rendering H264 output

I have send a report to Apple

You were the one who said you had the problem and brand new iMac Pro. On that information alone, Tom's advice is the correct one.

Of course, it is possible that you have taken this brand new iMac Pro, and have migrated your stuff from an older mac, and that may cause software problems.

In that case, it is up to you, the user, to do some troubleshooting.

The first thing I'd do is have a drive with a clean install and test.

If - as it is almost certainly the case - this clean system does NOT crash, it points to some conflict with other software.

The recommended course is to run Etrecheck and post its report for others here to take a look.

It may transpire that you have stuff dating from, say, 10.6; or you have antivirus that are causing the crashes, or that you have installed one of the infamous "cleaners". Nobody knows what software you are running, so we need that report in order to give further advice.

Did you try updating to 10.4.6?

Like Tom pointed out, several people that were affected said that updating solved the issue.

You said you were waiting for update to fix things, but you also said you were running 10.4.4, two versions behind the current one. You can’t know if it is fixed unless you try.

All of us have different setups, and very often symptoms like application slowdowns can be caused by very different things.

It seems that you have video "freezing", whereas the original problem was the SYSTEM "freezing", so a very different problem.

So you should probably start a new thread, and give much more information about the problem, including:

What is your mac model, system drive, media drive and connection, free space?

I restored to OS 10.14. I planned to keep FXPX at 10.4 but before I could turn off Auto Updates it went back to 10.4.6. OS did not auto update tho, and my issue resolved. So I agree its something with integrated graphics and anything over Mojave 10.14.

Could you share the names of some of these plugins? Have you contacted the developers?

This is in FCP 10.4.5? Flicker Free is slow to render for me, but it doesn't freeze.

Are you seeing the problem in the 10.4.4 beta as well?