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
