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Preview from BDMV folder so the BD-J menu Xlet actually loads

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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>
This commit is contained in:
happy 2026-08-25 14:57:31 -04:00
parent 9c88b8f7f6
commit 48c172cb80
3 changed files with 42 additions and 10 deletions
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30
scripts/run-vlc.sh
View file

@ -1,12 +1,28 @@
#!/usr/bin/env bash
set -euo pipefail
ISO_PATH="${1:-build/adjustments.iso}"
ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
MISE_BIN="${MISE_BIN:-$HOME/.local/bin/mise}"
if [[ ! -f "$ISO_PATH" ]]; then
echo "Missing ISO: $ISO_PATH" >&2
# Default to the on-disk BDMV folder, not the ISO.
#
# When libbluray opens a UDF *image* (.iso), its BD-J stack must first copy
# BDMV/JAR/00000.jar out of the image into a temp cache dir. On this setup that
# write is refused by libbluray's BD-J SecurityManager (usingUdf=true, no disc
# root), so the JAR never mounts, the Xlet class is never found, and VLC falls
# back to playing the raw playlist with no menu. Opening the *folder* lets
# libbluray read the JAR directly, so the Xlet (menu) loads. Pass an explicit
# path to override (folder or .iso).
TARGET="${1:-$ROOT_DIR/build/disc}"
if [[ -d "$TARGET" && ! -d "$TARGET/BDMV" ]]; then
echo "Not a BDMV folder (no BDMV/ inside): $TARGET" >&2
echo "Run: make" >&2
exit 1
fi
if [[ ! -e "$TARGET" ]]; then
echo "Missing disc target: $TARGET" >&2
echo "Run: make" >&2
exit 1
fi
@ -32,5 +48,9 @@ if [[ -d "$LOCAL_VLC_PLUGINS" ]]; then
export VLC_PLUGIN_PATH="$LOCAL_VLC_PLUGINS:/usr/lib/vlc/plugins${VLC_PLUGIN_PATH:+:$VLC_PLUGIN_PATH}"
fi
ABS_ISO="$(cd "$(dirname "$ISO_PATH")" && pwd)/$(basename "$ISO_PATH")"
exec vlc --reset-plugins-cache "bluray://$ABS_ISO"
if [[ -d "$TARGET" ]]; then
ABS_TARGET="$(cd "$TARGET" && pwd)"
else
ABS_TARGET="$(cd "$(dirname "$TARGET")" && pwd)/$(basename "$TARGET")"
fi
exec vlc --reset-plugins-cache --bluray-menu "bluray://$ABS_TARGET"