demo: commit the recording harness (#8)

2026-09-22 19:41:59 -04:00
parent bf3b8e1a05
commit 5916cdf8a2
12 changed files with 897 additions and 0 deletions
@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+# Record the Windows rewind demo. NO idle compression: the video timeline must
+# equal wall clock so the narration can be aligned to the recorded beat marks.
+set -uo pipefail
+SP="$(cd "$(dirname "$0")" && pwd)"
+REPO=/home/justin/github/zerto-ai-rewind
+PY="$REPO/.venv/bin/python"
+VPG_ID=$(python3 -c "import json;print(json.load(open('$SP/demo_win.json'))['vpg_id'])")
+TAKE="${1:-win1}"
+CAST="$SP/$TAKE.cast"; GIF="$SP/$TAKE.gif"; MP4="$SP/$TAKE.mp4"
+
+tmux -L demo kill-server 2>/dev/null; tmux -L rec kill-server 2>/dev/null; sleep 1
+rm -f "$SP/marks.jsonl"
+
+tmux -L demo new-session -d -s demo -x 200 -y 50 -c "$REPO" \
+  "$PY $SP/windows_driver.py; echo; echo '  [take complete]'; sleep 2; tmux -L demo kill-server"
+tmux -L demo set-option -g status off
+tmux -L demo split-window -h -l 60 -t demo -c "$REPO" \
+  "JOURNAL_ROWS=10 $PY $SP/journal.py $VPG_ID ad1"
+tmux -L demo select-pane -t 0
+
+tmux -L rec new-session -d -s rec -x 200 -y 50 \
+  "$SP/recvenv/bin/asciinema rec '$CAST' --overwrite --quiet -c 'tmux -L demo attach -t demo'"
+
+echo "recording -> $CAST"
+for i in $(seq 1 450); do tmux -L rec has-session -t rec 2>/dev/null || break; sleep 2; done
+tmux -L demo kill-server 2>/dev/null; tmux -L rec kill-server 2>/dev/null; sleep 1
+[ -s "$CAST" ] || { echo "NO CAST"; exit 1; }
+
+echo "cast duration: $(python3 -c "
+import json
+last=0
+for l in open('$CAST'):
+    l=l.strip()
+    if l.startswith('['): last=json.loads(l)[0]
+print(f'{last:.1f}s')")"
+# idle-time-limit huge = no compression, so 1s of cast == 1s of video
+"$SP/bin/agg" --font-size 14 --fps-cap 10 --idle-time-limit 3600 --theme asciinema "$CAST" "$GIF"
+ffmpeg -y -loglevel error -i "$GIF" -movflags +faststart -pix_fmt yuv420p -c:v libx264 -crf 20 \
+  -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" "$MP4"
+echo "MP4: $MP4 ($(du -h "$MP4" | cut -f1))"
+ffprobe -v error -show_entries format=duration:stream=width,height -of default=nw=1 "$MP4"