snapshot of https://github.com/tldraw/tldraw.git (main, 2026-09-23; blobs > 131072B omitted)

skills/pr-walkthrough/scripts/make-video.sh

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+#!/bin/bash
+# make-video.sh — Assemble walkthrough slides + audio into a final MP4.
+#
+# Usage:
+#   ./make-video.sh <slide-dir> <output.mp4> [outro-duration]
+#
+# Expects in <slide-dir>:
+#   slide-00.png, slide-01.png, ...  (one per segment, including outro)
+#   audio-00.wav, audio-01.wav, ...  (one per narrated segment)
+#
+# The last slide PNG without a matching audio WAV is the silent outro.
+#
+set -euo pipefail
+
+SLIDE_DIR="${1:?Usage: make-video.sh <slide-dir> <output.mp4> [outro-duration]}"
+OUTPUT="${2:?Usage: make-video.sh <slide-dir> <output.mp4> [outro-duration]}"
+OUTRO_DUR="${3:-3}"
+
+# Resolve relative paths
+[[ "$SLIDE_DIR" != /* ]] && SLIDE_DIR="$(pwd)/$SLIDE_DIR"
+[[ "$OUTPUT" != /* ]] && OUTPUT="$(pwd)/$OUTPUT"
+
+mkdir -p "$(dirname "$OUTPUT")"
+
+TMPDIR_WORK=$(mktemp -d)
+trap "rm -rf $TMPDIR_WORK" EXIT
+
+echo "=== Assembling video ==="
+echo "  Slides: $SLIDE_DIR"
+echo "  Output: $OUTPUT"
+
+# Count slides and audio
+SLIDE_COUNT=$(ls "$SLIDE_DIR"/slide-*.png 2>/dev/null | wc -l | tr -d ' ')
+AUDIO_COUNT=$(ls "$SLIDE_DIR"/audio-*.wav 2>/dev/null | wc -l | tr -d ' ')
+
+echo "  Found $SLIDE_COUNT slides, $AUDIO_COUNT audio clips"
+echo "  Last slide (no audio) = outro (${OUTRO_DUR}s)"
+
+# Create per-segment videos
+CONCAT_LIST="$TMPDIR_WORK/concat.txt"
+> "$CONCAT_LIST"
+
+for i in $(seq 0 $((SLIDE_COUNT - 1))); do
+  NUM=$(printf "%02d" $i)
+  SLIDE="$SLIDE_DIR/slide-${NUM}.png"
+  AUDIO="$SLIDE_DIR/audio-${NUM}.wav"
+  SEGMENT="$TMPDIR_WORK/segment-${NUM}.mp4"
+
+  if [ -f "$AUDIO" ]; then
+    # Get audio duration
+    DUR=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$AUDIO")
+    echo "  segment-${NUM}: slide + audio (${DUR}s)"
+
+    # Create video segment: static image for duration of audio, with audio
+    ffmpeg -y -loop 1 -i "$SLIDE" -i "$AUDIO" \
+      -c:v libx264 -tune stillimage -pix_fmt yuv420p \
+      -vf "scale=1600:900:force_original_aspect_ratio=decrease,pad=1600:900:(ow-iw)/2:(oh-ih)/2" \
+      -c:a aac -b:a 192k -ar 48000 \
+      -shortest -movflags +faststart \
+      "$SEGMENT" 2>/dev/null
+  else
+    # Silent outro slide
+    echo "  segment-${NUM}: silent outro (${OUTRO_DUR}s)"
+    ffmpeg -y -loop 1 -i "$SLIDE" -f lavfi -i anullsrc=r=48000:cl=mono \
+      -c:v libx264 -tune stillimage -pix_fmt yuv420p \
+      -vf "scale=1600:900:force_original_aspect_ratio=decrease,pad=1600:900:(ow-iw)/2:(oh-ih)/2" \
+      -c:a aac -b:a 192k -ar 48000 \
+      -t "$OUTRO_DUR" -movflags +faststart \
+      "$SEGMENT" 2>/dev/null
+  fi
+
+  echo "file '$SEGMENT'" >> "$CONCAT_LIST"
+done
+
+# Concatenate all segments
+echo ""
+echo "  Concatenating ${SLIDE_COUNT} segments..."
+ffmpeg -y -f concat -safe 0 -i "$CONCAT_LIST" \
+  -c copy -movflags +faststart \
+  "$OUTPUT" 2>/dev/null
+
+# Report
+FINAL_DUR=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$OUTPUT")
+FINAL_SIZE=$(ls -lh "$OUTPUT" | awk '{print $5}')
+echo ""
+echo "=== Done ==="
+echo "  Output: $OUTPUT"
+echo "  Duration: ${FINAL_DUR}s"
+echo "  Size: $FINAL_SIZE"