I want to create a collage of 20 screenshots from a video, arranged in a 5x4 grid, regardless of the video’s length. How can I do this efficiently on a Linux system?

Specifically, I’d like a way to automatically generate this collage of 20 thumbnails from the video, without having to manually select and arrange the screenshots. The number of thumbnails should always be 20, even if the video is longer or shorter.

Can you suggest a command-line tool or script that can handle this task efficiently on Linux? I’m looking for a solution that is automated and doesn’t require a lot of manual work.

Here’s what I’ve tried but I only get 20 black boxes:

#!/bin/bash

# Check if input video exists
if [ ! -f "$1" ]; then
    echo "Error: Input video file not found."
    exit 1
fi

# Get video duration
duration=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$1")

# Calculate interval between frames
interval=$((duration / 20))

# Extract 20 frames from the video
for i in {1..20}; do
    ffmpeg -ss $((interval * ($i - 1))) -i "$1" -vf scale=200:-1 -q:v 2 "${1%.*}_frame$i.jpg"
done

# Create collage
montage -mode concatenate -tile 5x4 -geometry +2+2 "${1%.*}_frame*.jpg" output_collage.jpg

# Clean up temporary files
rm "${1%.*}_frame*.jpg"

echo "Collage created: output_collage.jpg"
  • NegativeInf@lemmy.world
    5·
    3 months ago

    Requires ffmpeg and imagemagick

    #!/bin/bash

# Check if input video file is provided and exists
if [ $# -lt 1 ]; then
    echo "Usage: $0 <input_video>"
    exit 1
fi

input_video="$1"

if [ ! -f "$input_video" ]; then
    echo "Error: Input video file not found."
    exit 1
fi

# Get video duration in seconds (floating-point)
duration=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$input_video")

# Check if the duration was successfully extracted
if [ -z "$duration" ]; then
    echo "Error: Could not retrieve video duration."
    exit 1
fi

# Calculate fps as 20 frames divided by the duration
fps=$(echo "20 / $duration" | bc -l)

# Create a directory to store frames
mkdir -p frames


# Extract 20 frames from the video using the fps filter
ffmpeg -i "$input_video" -vf "fps=$fps,scale=200:-1" -frames:v 20 "frames/frame_%02d.jpg" -loglevel error

# Create the collage using ImageMagick's montage tool
montage -mode concatenate -tile 5x4 -geometry +2+2 frames/frame_*.jpg output_collage.jpg

# Clean up temporary files (delete frames directory)
rm -r frames

echo "Collage created: output_collage.jpg"