MPR - Media Processor

Media transcoding platform with dual execution modes: local (Celery + MinIO) and cloud (AWS Step Functions + Lambda + S3).

System Overview

Local Architecture (Development)

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AWS Architecture (Production)

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Components

Reverse Proxy (nginx)
Application Layer (Django Admin, GraphQL API, Timeline UI)
Worker Layer (Celery local mode)
AWS (Step Functions, Lambda - cloud mode)
Data Layer (PostgreSQL, Redis)
S3 Storage (MinIO local / AWS S3 cloud)

Data Model

Entity Relationships

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Entities

MediaAsset - Video/audio files with metadata
TranscodePreset - Encoding configurations
TranscodeJob - Processing queue items

Job Flow

Job Lifecycle

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Job States

PENDING - Waiting in queue
PROCESSING - Worker executing
COMPLETED - Success
FAILED - Error occurred
CANCELLED - User cancelled

Media Storage

MPR separates media into input and output paths, each independently configurable. File paths are stored relative to their respective root to ensure portability between local development and cloud deployments (AWS S3, etc.).

Input / Output Separation

MEDIA_IN - Source media files to process
MEDIA_OUT - Transcoded/trimmed output files

Why Relative Paths?

Portability: Same database works locally and in cloud
Flexibility: Easy to switch between storage backends
Simplicity: No need to update paths when migrating

Local Development

MEDIA_IN=/app/media/in
MEDIA_OUT=/app/media/out

/app/media/
├── in/                    # Source files
│   ├── video1.mp4
│   └── subfolder/video3.mp4
└── out/                   # Transcoded output
    └── video1_h264.mp4

AWS/Cloud Deployment

MEDIA_IN=s3://source-bucket/media/
MEDIA_OUT=s3://output-bucket/transcoded/
MEDIA_BASE_URL=https://source-bucket.s3.amazonaws.com/media/

Database paths remain unchanged (already relative). Just upload files to S3 and update environment variables.

API (GraphQL)

All client interactions go through GraphQL at /graphql.

scanMediaFolder - Scan S3 bucket for media files
createJob - Create transcode/trim job
cancelJob / retryJob - Job lifecycle management
updateAsset / deleteAsset - Asset management

Supported File Types:

Video: mp4, mkv, avi, mov, webm, flv, wmv, m4v
Audio: mp3, wav, flac, aac, ogg, m4a

Access Points

# Add to /etc/hosts
127.0.0.1 mpr.local.ar

# URLs
http://mpr.local.ar/admin    - Django Admin
http://mpr.local.ar/graphql  - GraphiQL IDE
http://mpr.local.ar/         - Timeline UI