Root causes found this session (all player-side, disc is valid -- bd_info
validates it and mpv plays the ISO's feature directly):
- Plain 'vlc <iso>' can't run ANY BD-J: system Java is 26, and libbluray's BD-J
needs a JVM where System.setSecurityManager() works (<=21). run-vlc.sh pins
mise Temurin 8, which is why it gets a menu at all.
- The BD-J VFS-cache 'error creating /tmp/libbluray-bdj-cache' flood is
libbluray's SecurityManager.canWrite() denying the cache root while an Xlet
context is active. Fixed by pointing TMPDIR at LIBBLURAY_CACHE_ROOT (buda
root), which canWrite() allows unconditionally.
- Menu->playback failed with 'blurayReleaseVout: subpicture channel exists':
VLC botches the background->playlist transition for an idle BD-J menu. Now the
Xlet starts the feature immediately and draws the menu on top, so VLC stays in
normal playing mode; MAIN FEATURE just hides the menu, any key brings it back,
and the feature loops.
Also: drop the redundant tools/vlc-plugins swap (system VLC already ships the
bluray plugin), and add scripts/run-mpv.sh to play the feature with no BD-J/JVM
at all. Vendored the SDK helloworld sample for reference.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The disc structure, signed JAR, and video are all valid. The menu never
appeared because 'make run' opened the UDF .iso: libbluray's BD-J stack must
copy BDMV/JAR/00000.jar out of the image into /tmp/libbluray-bdj-cache before
the JVM can load it, and that write is refused by libbluray's BD-J
SecurityManager (usingUdf=true / no disc root). With no JAR mounted the Xlet
class isn't found (ClassNotFoundException: org.homebrew.MyXlet) and VLC falls
back to the raw playlist -> video, no menu.
Opening the build/disc BDMV folder instead lets libbluray read the JAR
directly, so the Xlet loads and the menu overlay runs. The ISO is still built
for burning; real players read the JAR from the disc filesystem directly.
- run-vlc.sh: default to build/disc, accept folder or .iso, add --bluray-menu
- Makefile: 'run' depends on the disc folder, not the ISO
- README: document the folder-vs-ISO libbluray caveat
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Vendored BD-J SDK, tsMuxeR + local VLC plugins, ffmpeg asset generation,
and a signed BD-J Xlet menu (org.homebrew.MyXlet) authored into a UDF 2.50 ISO.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
