Video & Image Processing Scripts

A collection of high-performance shell scripts for video compression, image optimization, and format conversion, designed for web content optimization.

Table of Contents

• Prerequisites
• Scripts Overview
• Installation
• Usage
• Configuration
• Examples
• Troubleshooting

Prerequisites

Required dependencies:

• ffmpeg for video processing
• ImageMagick for image processing
• libwebp-tools for WebP conversion
• bc for mathematical calculations

Install dependencies on Ubuntu/Debian:

sudo apt update
sudo apt install ffmpeg imagemagick webp bc

Scripts Overview

1. Video Compression Script (compress_video.sh)

Compresses and optimizes videos for web delivery with responsive sizes.

Features:

• Multiple output sizes (mobile, tablet, desktop)
• Object-cover-like scaling
• WebP thumbnail generation
• Progress tracking
• Quality preservation
• Automatic aspect ratio handling

2. Video Cropping Script (crop_video.sh)

Crops and resizes videos while maintaining aspect ratios.

Features:

• Smart cropping with center focus
• Custom dimensions support
• Progress tracking
• WebP thumbnail generation
• Multiple output formats

3. Image Compression Script (compress_image.sh)

Optimizes JPEG images for web use.

Features:

• Maintains image quality
• Strips metadata
• Resizes to maximum dimensions
• Progressive loading support
• Batch processing capability

4. WebP Conversion Script (convert_webp.sh)

Converts images to WebP format with optimization.

Features:

• Quality control
• Batch processing
• Size comparison
• Progress tracking
• Original file preservation

Installation

1. Clone or download the scripts
2. Make them executable:

chmod +x compress_video.sh crop_video.sh compress_image.sh convert_webp.sh

Usage

Video Compression

./compress_video.sh input_video.mp4
# or process all videos in input directory
./compress_video.sh

Video Cropping

./crop_video.sh input_video.mp4

Image Compression

./compress_image.sh -q 82 -w 1920 -p "*.jpg" -o compressed

WebP Conversion

./convert_webp.sh -q 82 -p "*.jpg" -o webp

Configuration

Video Compression Settings

# Default CRF values (lower = better quality)
LAPTOP_CRF=23
TABLET_CRF=24
MOBILE_CRF=25

# Default dimensions
LAPTOP: 1920x1080
TABLET: 1280x720
MOBILE: 854x480

Image Compression Settings

QUALITY=82        # JPEG quality
MAX_WIDTH=1920    # Maximum width

WebP Conversion Settings

QUALITY=82        # WebP quality

Examples

Compress a Video for Web

./compress_video.sh video.mp4

Output:

• video_laptop.mp4 (1920x1080)
• video_tablet.mp4 (1280x720)
• video_mobile.mp4 (854x480)
• video_thumb_[size].webp

Crop Video to Specific Dimensions

./crop_video.sh video.mp4

Output:

• video_mobile.mp4 (500x700)
• video_tablet.mp4 (800x700)
• video_thumb.webp

Compress Images

./compress_image.sh -q 85 -w 1600 -p "images/*.jpg"

Convert to WebP

./convert_webp.sh -p "french-dandy-*.jpg" -q 85

Troubleshooting

Common Issues

1. Permission Denied

chmod +x script_name.sh

2. FFmpeg Not Found

sudo apt install ffmpeg

3. Low Quality Output

• Adjust CRF values (lower number = higher quality)
• Modify quality settings for images

4. Processing Fails

• Check input file exists
• Verify sufficient disk space
• Check FFmpeg/ImageMagick installation

Tips

• Use -h flag for help with any script
• Monitor output directory for space
• Check generated file sizes and quality
• Use appropriate quality settings for your needs

License

These scripts are provided under the MIT License.

Contributing

Feel free to submit issues, fork the repository, and create pull requests.