From d8f1cd9e71c8bb1406466b5bf8861332bb334637 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=27=C3=A9lectron=20rare?=
 <108685187+electron-rare@users.noreply.github.com>
Date: Mon, 29 Jun 2026 22:24:14 +0200
Subject: [PATCH] fix(launcher): gpu mediapipe delegate on non-M5

---
 launcher/concert/launch_concert.sh | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/launcher/concert/launch_concert.sh b/launcher/concert/launch_concert.sh
index c04470e..cd0111c 100755
--- a/launcher/concert/launch_concert.sh
+++ b/launcher/concert/launch_concert.sh
@@ -12,7 +12,15 @@ set -u
 REPO="$HOME/Documents/Projets/AV-Live"
 DEV="AC1CDE5F-DDC4-5B2C-80D7-9953D8ABA0AC"   # iPhone 16 Pro (xcrun devicectl list devices)
 export PATH=/opt/homebrew/bin:$PATH
-export MEDIAPIPE_DELEGATE=cpu
+# MediaPipe Metal GPU delegate runs Pose+Face+Hand inference on the GPU instead of
+# the CPU. The CPU delegate pegged ~1.6 cores and, under load, starved the realtime
+# pose loop -> choppy/jittery/flickering detection (body+hands). GPU frees the CPU
+# (measured 163%->60% on M1 Max) and is stable on M1/M2/M3 Max. It flakes on M5, so
+# fall back to cpu there.
+case "$(sysctl -n machdep.cpu.brand_string 2>/dev/null)" in
+  *M5*) export MEDIAPIPE_DELEGATE=cpu ;;
+  *)    export MEDIAPIPE_DELEGATE=gpu ;;
+esac
 export POSE_FILTER=median+kalman+lookahead+ik+arkit_fuse
 # CONCERT_MIRROR=0 in the environment disables the video mirror.