ci: throwaway mac snapshot timing

Author: miguel-heygen

.github/workflows/dscan-snap-mac.yml

@@ -0,0 +1,45 @@
+name: dscan-snap-mac
+on:
+  push:
+    branches: [ci/dscan-snap-mac]
+jobs:
+  snap:
+    runs-on: macos-15
+    timeout-minutes: 30
+    steps:
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 24
+      - name: project
+        run: |
+          brew list ffmpeg >/dev/null 2>&1 || brew install ffmpeg >/dev/null 2>&1
+          mkdir proj && cd proj
+          echo '{}' > hyperframes.json
+          ffmpeg -v error -y -f lavfi -i "testsrc2=size=1280x720:rate=30" -t 8 -pix_fmt yuv420p clip.mp4
+          cat > index.html <<'H'
+          <!doctype html><html><head><meta charset="utf-8"></head><body style="margin:0;background:#101820">
+          <div id="root" data-composition-id="main" data-start="0" data-duration="8" data-width="1280" data-height="720">
+          <video id="v" src="clip.mp4" data-start="0" data-duration="8" data-track-index="0" muted playsinline></video>
+          <div style="position:absolute;left:80px;top:60px;font:72px Arial;color:#fff">Static title</div>
+          </div>
+          <script src="https://cdn.jsdelivr.net/npm/gsap@3.12.5/dist/gsap.min.js"></script>
+          <script>window.__timelines=window.__timelines||{};window.__timelines["main"]=gsap.timeline({paused:true});</script>
+          </body></html>
+          H
+          npx -y hyperframes@0.8.219 browser ensure 2>&1 | tail -n 3
+      - name: time default vs software
+        run: |
+          cd proj
+          t() { s=$(date +%s.%N 2>/dev/null || python3 -c 'import time;print(time.time())'); "$@" >/dev/null 2>&1; e=$(python3 -c 'import time;print(time.time())'); python3 -c "import sys;print('%.1f' % (float('$e')-float('$s')))"; }
+          python3 - <<'P'
+          import subprocess,time
+          def run(label,args):
+              out=[]
+              for i in range(3):
+                  s=time.time(); r=subprocess.run(["npx","-y","hyperframes@0.8.219","snapshot","--at","1,3,5","--no-end","--describe","false","-o","shots_"+label]+args,capture_output=True,text=True); out.append(round(time.time()-s,1))
+              print(label,out,"exit",r.returncode)
+          run("default",[])
+          run("software",["--no-browser-gpu"])
+          run("default2",[])
+          run("software2",["--no-browser-gpu"])
+          P