🎬 8MB Video Compressor (Termux)

A smart Bash script that compresses videos to a user-defined target size using ffmpeg, designed for Termux and lightweight environments.

💬 Discord Note: Discord currently allows 10MB uploads for free users. The script defaults to 8MB for safety but lets you choose another target size interactively at runtime.

Perfect for:

• Discord uploads (10MB free limit — 8MB default)
• Quick file sharing
• Mobile encoding via Termux
• Low-resource Linux systems

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📦 Features

• 🎯 User-selectable target output size (default 8MB)
• 🔁 2-pass encoding for accurate size targeting
• 📊 Real-time progress bar
• 🧠 Automatic bitrate calculation
• 🔊 Smart audio/video bitrate allocation
• 📐 Auto resolution detection
• 📉 Auto downscale to 720p if width > 1280px
• ⚡ Uses all available CPU cores
• 📱 Optimized for Termux & minimal systems
• 🧹 Automatic temporary file cleanup

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🛠 Requirements

You need:

• bash
• ffmpeg
• ffprobe
• coreutils (for nproc, usually preinstalled)

Install in Termux:

pkg update
pkg install ffmpeg

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🚀 Usage

chmod +x compress8mb.sh
./compress8mb.sh input.mp4 output.mp4

When running, you will be prompted:

Enter target size in MB (default 8 MB):

• Press Enter to keep 8MB
• Type 10 or any other number to change target size

Example:

./compress8mb.sh video.mp4 compressed.mp4

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⚙️ How It Works

1. Prompts for target size (default 8MB)

2. Reads video duration using ffprobe

3. Converts target size into total available kilobits

4. Reserves 64 kbps for audio

5. Assigns remaining bitrate to video

6. Downscales to 720p if width > 1280px

7. Performs 2-pass encoding:

   • Pass 1: analysis
   • Pass 2: final encode with progress tracking

8. If file exceeds target:

   • Reduces video bitrate by 5%
   • Re-encodes automatically

9. Cleans up temporary files

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🧮 Bitrate Formula

Target size (MB) × 8192 = total kilobits
Total kilobits ÷ duration (seconds) = total bitrate (kbps)
Video bitrate = total bitrate − audio bitrate

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📊 Example Output

══════════════════════════════════════
Duration: 120s
Target: 8MB
Video Bitrate: 482k
Audio Bitrate: 64k
Threads: 24
Scaling: 720p
Codec: libx264 (2-pass)
══════════════════════════════════════
Progress: [##########################          ] 54% (65s/120s)
Done: compressed.mp4 (~8MB)

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⚠️ Notes

• Output size will never exceed target
• Very long videos will have lower quality (bitrate constrained)
• Very short videos may look very high quality
• Uses all logical CPU cores detected via nproc
• Designed for reliability over raw speed

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🔧 Customization

You can change the default prompt value or modify audio/preset options:

# Default prompt value
DEFAULT_TARGET_MB=8

# Change audio bitrate (kbps)
AUDIO_BITRATE=64

# Change x264 preset
-preset fast

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🆚 Why 2-Pass?

2-pass encoding:

• Improves bitrate distribution
• Ensures accurate file size
• Produces better quality at low bitrates
• Guarantees ≤ TARGET_MB output

This version prioritizes accuracy and reliability while remaining lightweight.

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📄 License

MIT License — free to use and modify.

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