Crash on macOS 26 when playing music file

[Kevin Rushforth]

I was able to play that media file with no problem on macOS 26.1 using 
the tests/manual/media/FXMediaPlayer app in the FX repo. I didn't try 
with your application.

I can see from the hs_err log you attached, that it is crashing in our 
libjfxmedia_avf library in a callback from CoreFoundation.

I was running JDK 25.0.1 and I tried the latest mainline JavaFX (26 ea) 
as well as JavaFX 25.0.1. Can you confirm the exact versions of JDK 25 
and JavaFX 25 you were running?

-- Kevin


On 11/25/2025 5:07 AM, Christopher Schnick wrote:
> Hello, I encountered a reproducible crash when playing a music file 
> with MediaPlayer. This does not occur on older versions of the app 
> using an older JDK+JavaFX version on macOS 26.
>
> It crashes with JDK25 and JavaFX 25 for me. Attached is the crash log.
>
> I have not tested this in an isolated reproducer, but I don't see how 
> any of my application logic can influence this. If it does not happen 
> in an isolated manner, I can investigate what specific changes cause 
> it to crash. The music file I tested with is from 
> https://github.com/mkpaz/atlantafx/blob/master/sampler/src/main/resources/atlantafx/sampler/media/Beat%20Thee.mp3 
> . The project to reproduce the crash is 
> https://github.com/xpipe-io/kickstartfx, where you just have to select 
> the music player and click on play sample.
>
> Best
> Christopher Schnick
>
> P.S. There is still a message I sent a few days ago in the mailing 
> list moderation queue because it was larger than the maximum allowed 
> attachment size
>
>