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Q&A How can I efficiently create a collage of video thumbnails on Linux?

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 t...

2 answers  ·  posted 1mo ago by ShadowsRanger‭  ·  last activity 1mo ago by GeraldS‭

Question bash
#2: Post edited by user avatar ShadowsRanger‭ · 2024-10-08T10:52:57Z (about 1 month ago)
  • 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.
  • To create a collage of 20 screenshots from a video on a Linux system, we can use a combination of FFmpeg (for video processing) and ImageMagick (for image manipulation).
  • Here's what I've tried but I only get 20 black boxes:
  • 1. The script checks if the input video exists.
  • 2. It calculates the duration of the video and determines the interval between frames (approximately 1 second in this case).
  • 3. FFmpeg is used to extract 20 frames from the video at regular intervals.
  • 4. ImageMagick's `montage` tool creates a 5x4 grid collage from the extracted frames.
  • 5. Finally, the script cleans up temporary files.
  • ```bash
  • #!/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"
  • ```
  • 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:
  • ```bash
  • #!/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"
  • ```
#1: Initial revision by user avatar ShadowsRanger‭ · 2024-10-08T10:52:03Z (about 1 month ago)
How can I efficiently create a collage of video thumbnails on Linux?
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.

To create a collage of 20 screenshots from a video on a Linux system, we can use a combination of FFmpeg (for video processing) and ImageMagick (for image manipulation).

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

1. The script checks if the input video exists.
2. It calculates the duration of the video and determines the interval between frames (approximately 1 second in this case).
3. FFmpeg is used to extract 20 frames from the video at regular intervals.
4. ImageMagick's `montage` tool creates a 5x4 grid collage from the extracted frames.
5. Finally, the script cleans up temporary files.

```bash
#!/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"
```