Batch Video Speed Up

A Python CLI tool to batch speed up MP4 videos in a directory.

Features

• Batch process all .mp4 files in a directory
• Configurable speed multiplier (default: 5x)
• High-quality output using libx264 with CRF 18
• Skips already processed files to avoid redundant work
• Preserves audio (sped up accordingly)

Requirements

• Python 3.x
• ffmpeg (must be installed and available in PATH)
• moviepy

Installation

1. Install ffmpeg:

   # macOS
   brew install ffmpeg
   
   # Ubuntu/Debian
   sudo apt install ffmpeg
   
   # Windows
   # Download from https://ffmpeg.org/download.html

2. Install Python dependencies:

   pip install moviepy

Usage

# Speed up videos by 5x (default)
python videos_speed_up.py -d /path/to/videos

# Speed up videos by 10x
python videos_speed_up.py -d /path/to/videos -s 10

# Using long flags
python videos_speed_up.py --directory /path/to/videos --speed 3

Arguments

Argument	Short	Required	Default	Description
--directory	-d	Yes	-	Path to folder containing .mp4 files
--speed	-s	No	5	Speed multiplier

Output

Processed videos are saved in the same directory with the speed factor appended to the filename:

• video.mp4 → video_5x.mp4

Running Tests

# Run all tests
pytest

# Run with verbose output
pytest -v

# Run specific test class
pytest test_videos_speed_up.py::TestProcessVideos

# Run tests matching pattern
pytest -k "test_speed"

License

MIT