This script is designed to create a selective and impactful collage, utilizing a 3x5 tile layout to present a selection of moments from the video. By extracting 15 frames at optimized intervals and sizes, and outputting as a high-quality JPEG, the script aims to produce a visually engaging summary of the video content.

create_collage.sh

#!/bin/bash

# Check for the correct number of arguments
if [ "$#" -ne 1 ]; then
    echo "Usage: $0 <video_filename>"
    exit 1
fi

VIDEO_FILE="$1"
DURATION=$(ffmpeg -i "$VIDEO_FILE" 2>&1 | grep Duration | awk '{print $2}' | tr -d , | awk -F: '{print $1*3600+$2*60+$3}')
# Calculate the interval for extracting 15 frames
INTERVAL=$(echo "scale=2; $DURATION / 15" | bc -l)

TEMP_DIR=$(mktemp -d)

# Extract and scale down frames to fit within 800 pixels in width, maintaining aspect ratio
ffmpeg -i "$VIDEO_FILE" -vf "fps=1/$INTERVAL,scale='min(800,iw):-2'" -vsync vfr "$TEMP_DIR/frame_%04d.png"

OUTPUT_FILE="${VIDEO_FILE%.*}-collage.jpg"
# Update the montage command for a 3x5 tile layout and output as JPEG
montage "$TEMP_DIR/frame_*.png" -geometry +0+0 -tile 3x5 -quality 85 "$OUTPUT_FILE"

# Clean up the temporary directory
rm -r "$TEMP_DIR"

echo "Collage created: $OUTPUT_FILE"