How is the stability of FCP 11.1 on macOS 15.5?

I see that 15.5 is available for install. Tom, Luis, Joema, Ben, have you tried it with FCP 11.1?


[Re-Titled by Moderator]

Original Title: MacOS 15.5 and FCP 11.1?

Posted on May 21, 2025 6:02 PM

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Posted on Jun 3, 2025 3:00 PM

It was reported on M2 Max and MacBook Pro M4 Air. I reproduced it on M1 Ultra. It might be Apple-Silicon specific. The test clip I used was 60 seconds, 4k/23.98 10-bit 4:2:2 HEVC. I plan on testing other codecs and machines, and isolating the version where this appeared (maybe 11.0?), but I haven't done that yet.


Since Apple Silicon was released, there have been several bugs specific to Apple Silicon (not Intel) and a few specific to M-series CPUs with multiple encode/decode units such as Max/Ultra. Recently, we had a bug reported that was unique to M4. So it can take considerable testing to feel out possible dependencies on specific M-series versions.

28 replies

Jun 2, 2025 11:57 AM in response to Ian R. Brown

-To Ian-

Exactly how were the shape mask and Gaussian blur used and what was the media?

Media details.



OP provided media samples and library(version 11.1.1) *Deadline June 8th

https://xgf.nu/HwWXJ



-To joema-

Zip or compress file and upload to here: https://we.tl/r-SoCdwheEdK

Could not add. When I downloaded OP's Spindump.zip, an empty folder was displayed. Is this correct?


Spindump.zip

https://xgf.nu/Vw54S


Jun 2, 2025 1:55 PM in response to LocaAlicia

I could not download anything from that site. They need to use a well-known file-sharing site like Dropbox, Google Drive, WeTransfer, etc.


I double-checked that the WeTransfer file request URL I previously posted is still active. It is. This one, which has not changed: https://we.tl/r-SoCdwheEdK


Note: this one is solely for *uploading* files, similar to a Dropbox "File Request Folder." It is not a general-purpose upload/download location. Only I can see uploaded files there, which if needed I will re-share to the group separately. This is for security reasons to prevent inadvertent spread of malware.

Jun 3, 2025 5:24 PM in response to Ian R. Brown

I couldn't understand where to click on the page that opened.

⚫︎Screenshots and GIF animations


・Screenshot of the editing screen

・Screenshot of when it freezes during editing (First time applying Gaussian: No freeze, Second time: Frozen)


The link to the OP's question has already been provided. You can get the information you want on the Japanese site. Ian, have you looked at the Japanese site? I haven't put it on the US site yet, but I'm waiting for other information necessary for verification.

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How is the stability of FCP 11.1 on macOS 15.5?

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