Add bounded session playback, synced audio and frame thumbnails

scripts/validate/measure-cpu.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+"""Measure child CPU/wall time without depending on GNU time."""
+import pathlib
+import resource
+import subprocess
+import sys
+import time
+
+before = resource.getrusage(resource.RUSAGE_CHILDREN)
+started = time.monotonic()
+result = subprocess.run(sys.argv[2:], check=False)
+elapsed = time.monotonic() - started
+usage = resource.getrusage(resource.RUSAGE_CHILDREN)
+user = usage.ru_utime - before.ru_utime
+system = usage.ru_stime - before.ru_stime
+pathlib.Path(sys.argv[1]).write_text(
+    f"cpu_user={user:.3f} cpu_system={system:.3f} wall={elapsed:.3f} "
+    f"cpu_percent={(user + system) / elapsed * 100:.1f}%\n"
+)
+sys.exit(result.returncode)