iter1 phase3: archive helper scripts used during baseline measurement

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

phase3_scripts/safe_probe.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+# Safe baseline probe — only the 3 codecs that should work on this kernel.
+# HEVC SKIPPED (oopses kernel rkvdec_hevc_prepare_hw_st_rps).
+# VP9 SKIPPED (mainline-rc3 RK3588 rkvdec doesn't expose V4L2_PIX_FMT_VP9_FRAME).
+# AV1 SKIPPED (libva backend iter38b only probes 2 fds, not the av1-vpu-dec at /dev/media3).
+echo "=== ampere baseline: libva HW decode probe (H.264 + VP8 + MPEG-2) ==="
+for codec in h264 vp8 mpeg2; do
+  case $codec in
+    h264)  cf=$HOME/measurements/encoded/bbb_60s_720p.h264.mp4 ; route="rkvdec /dev/video1" ;;
+    mpeg2) cf=$HOME/measurements/encoded/bbb_60s_720p.mpeg2.ts ; route="hantro /dev/video2" ;;
+    vp8)   cf=$HOME/measurements/encoded/bbb_60s_720p.vp8.webm ; route="hantro /dev/video2" ;;
+  esac
+  t0=$(date +%s.%N)
+  out=$(LIBVA_DRIVER_NAME=v4l2_request timeout 12 ffmpeg -hide_banner -loglevel error \
+      -hwaccel vaapi -hwaccel_output_format vaapi \
+      -i "$cf" -vf "hwdownload,format=nv12" -f null - 2>&1 </dev/null)
+  rc=$?
+  t1=$(date +%s.%N)
+  el=$(awk "BEGIN { printf \"%.2f\", $t1-$t0 }")
+  status=$([ $rc -eq 0 ] && echo "OK" || echo "FAIL rc=$rc")
+  fps=$(echo "$out" | grep -oE "fps=[ ]*[0-9.]+" | tail -1)
+  frames=$(echo "$out" | grep -oE "frame=[ ]*[0-9]+" | tail -1)
+  err=$(echo "$out" | grep -iE "error|invalid|failed|not supported|unable" | head -1)
+  printf "  %-6s  %-25s  %s  elapsed=%ss  %s %s  %s\n" "$codec" "$route" "$status" "$el" "${frames}" "${fps}" "$err"
+done
+echo "=== done $(date -Iseconds) ==="