video-generation-api 1.0.0

A powerful Docker-based API for intelligent video generation with professional effects and subtitles

Video Generation API v1.0

中文版

🎬 A powerful Docker-based API for intelligent video generation with professional effects and subtitles.

🚀 Quick Start

Pull and Run

# Pull the Docker image
docker pull betashow/video-generation-api:latest

# Run the container
docker run -d \
  --name video-api \
  -p 5000:5000 \
  betashow/video-generation-api:latest

The API will be available at http://localhost:5000

🚀 Want to Deploy This on AWS?

Check out my second open source project: CloudBurst

CloudBurst helps you deploy this Video Generation API on AWS with:

• ⚡ On-demand instances - Pay only when you need it
• 💰 96% cost savings - Compared to 24/7 GPU instances
• 🔄 Fully automated - Create → Deploy → Process → Terminate
• 📊 Real-time cost tracking - Know exactly what you're paying

Perfect for production use cases where you need to generate videos occasionally but don't want to maintain expensive infrastructure.

📖 API Documentation

Core Endpoint: /create_video_onestep

A single intelligent endpoint that automatically handles all video creation scenarios based on your input parameters.

Request Format

URL: POST http://your-server:5000/create_video_onestep

Headers:

{
  "Content-Type": "application/json",
  "X-Authentication-Key": "your-key-if-required"
}

Body Parameters:

Parameter	Type	Required	Description
input_image	string	Yes	Base64 encoded image (JPG/PNG)
input_audio	string	Yes	Base64 encoded audio (MP3/WAV)
subtitle	string	No	Base64 encoded SRT subtitle file
effects	array	No	Effects to apply. Available: "zoom_in", "zoom_out", "pan_left", "pan_right", "random"
language	string	No	Subtitle language: "chinese" or "english" (default: chinese)
background_box	boolean	No	Show subtitle background (default: true)
background_opacity	float	No	Subtitle background transparency 0-1 (default: 0.2) See important note below
font_size	integer	No	Subtitle font size in pixels (default: auto-calculated based on video size)
outline_color	string	No	Subtitle outline color in ASS format (default: "&H00000000" - black)
is_portrait	boolean	No	Force portrait orientation (default: auto-detect)
watermark	string	No	Base64 encoded watermark image
output_filename	string	No	Preferred output filename

Processing Scenarios

The API automatically detects and optimizes for 4 scenarios:

Scenario	Effects	Subtitles	Description
Baseline	❌	❌	Simple image + audio merge (fastest)
Subtitles Only	❌	✅	Basic video with professional subtitles
Effects Only	✅	❌	Cinematic zoom/pan effects
Full Featured	✅	✅	Effects + professional subtitles

Response Format

{
  "success": true,
  "file_id": "f47ac10b-58cc-4372-a567-0e02b2c3d479",
  "download_endpoint": "/download/f47ac10b-58cc-4372-a567-0e02b2c3d479",
  "filename": "output.mp4",
  "size": 15728640,
  "scenario": "full_featured"
}

Complete Examples

1. Baseline (Simplest)

import requests
import base64

def encode_file(filepath):
    with open(filepath, 'rb') as f:
        return base64.b64encode(f.read()).decode('utf-8')

# Prepare inputs
image_b64 = encode_file('image.jpg')
audio_b64 = encode_file('audio.mp3')

# Make request
response = requests.post('http://localhost:5000/create_video_onestep', 
    json={
        'input_image': image_b64,
        'input_audio': audio_b64
    }
)

result = response.json()
if result['success']:
    # Download the video
    download_url = f"http://localhost:5000{result['download_endpoint']}"
    video = requests.get(download_url)
    with open('output.mp4', 'wb') as f:
        f.write(video.content)

2. With Chinese Subtitles

subtitle_b64 = encode_file('subtitles.srt')

response = requests.post('http://localhost:5000/create_video_onestep',
    json={
        'input_image': image_b64,
        'input_audio': audio_b64,
        'subtitle': subtitle_b64,
        'language': 'chinese',
        'background_box': True,
        'background_opacity': 0.2
    }
)

3. With Effects

# Zoom effects (randomly picks one)
response = requests.post('http://localhost:5000/create_video_onestep',
    json={
        'input_image': image_b64,
        'input_audio': audio_b64,
        'effects': ['zoom_in', 'zoom_out']  # Randomly chooses zoom_in OR zoom_out
    }
)

# Pan effects
response = requests.post('http://localhost:5000/create_video_onestep',
    json={
        'input_image': image_b64,
        'input_audio': audio_b64,
        'effects': ['pan_left']  # Pan from right to center
    }
)

# Let system choose randomly from all effects
response = requests.post('http://localhost:5000/create_video_onestep',
    json={
        'input_image': image_b64,
        'input_audio': audio_b64,
        'effects': ['random']  # System picks any available effect
    }
)

4. Full Featured (Effects + Subtitles)

response = requests.post('http://localhost:5000/create_video_onestep',
    json={
        'input_image': image_b64,
        'input_audio': audio_b64,
        'subtitle': subtitle_b64,
        'effects': ['zoom_in', 'zoom_out'],
        'language': 'chinese'
    }
)

5. Advanced Subtitle Customization

response = requests.post('http://localhost:5000/create_video_onestep',
    json={
        'input_image': image_b64,
        'input_audio': audio_b64,
        'subtitle': subtitle_b64,
        'language': 'chinese',
        'font_size': 48,                    # Custom font size
        'outline_color': '&H00FF0000',      # Blue outline
        'background_box': True,             # Show background
        'background_opacity': 0.3           # 30% transparent (dark background)
    }
)

Other Endpoints

Health Check

GET /health

Returns API status, FFmpeg version, and available endpoints.

Download Video

GET /download/{file_id}

Download the generated video file. Files expire after 1 hour.

Cleanup Expired Files

GET /cleanup

Manually trigger cleanup of expired files.

🔧 Authentication

The API supports two modes:

Default Mode (No Authentication)

By default, the API is open and requires no authentication.

Secure Mode

Set the AUTHENTICATION_KEY environment variable to enable authentication:

docker run -d \
  -e AUTHENTICATION_KEY=your-secure-uuid-here \
  -p 5000:5000 \
  betashow/video-generation-api:latest

Then include the key in your requests:

headers = {
    'Content-Type': 'application/json',
    'X-Authentication-Key': 'your-secure-uuid-here'
}

🎯 Features

• Intelligent Processing: Automatically optimizes based on input parameters
• Professional Subtitles: High-quality subtitle rendering (not FFmpeg filters)
• Auto-Orientation: Detects portrait/landscape videos automatically
• Cinematic Effects: Hollywood-style zoom and pan effects
• Multi-Language: Supports Chinese and English with proper fonts
• GPU Acceleration: Automatic GPU detection and usage when available

🎨 Advanced Subtitle Styling

Subtitle Background Transparency

⚠️ IMPORTANT: The background_opacity parameter controls transparency, not opacity!

Value	Visual Result	Description
0.0	Solid black	Completely opaque background
0.2	Dark background	Default - Good readability
0.5	Semi-transparent	50% see-through
0.7	Very transparent	Old default - quite see-through
1.0	No background	Completely transparent

Examples:

• For darker, more readable subtitles: Use lower values (0.0 - 0.3)
• For more transparent subtitles: Use higher values (0.5 - 1.0)
• Recommended: 0.2 (the new default) provides excellent readability

# Dark, readable background (recommended)
'background_opacity': 0.2

# Solid black background
'background_opacity': 0.0

# Very transparent (hard to read)
'background_opacity': 0.8

Color Format (ASS/SSA Style)

The outline_color parameter uses ASS subtitle format: &HAABBGGRR where:

• AA = Alpha (transparency): 00 = opaque, FF = transparent
• BB = Blue component (00-FF)
• GG = Green component (00-FF)
• RR = Red component (00-FF)

Common Colors:

• &H00000000 - Black (default)
• &H00FFFFFF - White
• &H000000FF - Red
• &H0000FF00 - Green
• &H00FF0000 - Blue
• &H0000FFFF - Yellow
• &H00FF00FF - Magenta

Font Size Guidelines

If not specified, font size is auto-calculated based on video resolution:

• 1080p Landscape: ~45px for Chinese, ~60px for English
• 1080p Portrait: ~21px for Chinese, ~30px for English
• 4K Videos: Proportionally larger

📋 Requirements

• Docker
• 2GB+ RAM (4GB recommended)
• 10GB+ free disk space
• GPU (optional, for faster processing)

🎬 Output Examples

See what this API can generate:

English Example:

Chinese Example:

Features Demonstrated:

• ✅ Professional subtitles with semi-transparent background
• ✅ Smooth zoom effects (Ken Burns effect)
• ✅ Perfect audio-visual synchronization
• ✅ High-quality 1080p video output
• ✅ Support for both English and Chinese

Both examples were generated using the "Full Featured" mode with subtitles and effects enabled.

🐳 Docker Image Details

The image includes:

• Ubuntu 22.04 base
• FFmpeg with GPU support
• Python 3.10
• Chinese fonts (LXGW WenKai Bold)
• All required video processing libraries

📝 Notes

• All file inputs must be Base64 encoded
• Generated videos expire after 1 hour
• The API returns relative download paths, not full URLs
• This is designed for on-demand, disposable container usage

🚨 Important

This Docker image is designed for temporary, on-demand usage. The container can be destroyed and recreated as needed - all paths are relative and no persistent storage is required.

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Ready to generate amazing videos? Start the container and make your first request!