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