Welcome to Viewline Doc

Viewline is a professional Python-based review player framework for VFX, animation, and post-production workflows. It provides accurate frame-based and time-based playback for image sequences and movie files while integrating seamlessly with production management and publishing workflows.

This project is to provide a lightweight, extensible, and production-friendly framework for media playback, image sequence review, OpenEXR workflows, and OCIO-based color management.

Core Responsibilities

Review image sequences, movie files and 3D Scene(usd).
Frame-accurate playback.
Audio and video synchronization.
Timeline navigation and scrubbing.
Playback controls (Play, Pause, Loop, Frame Step).
OpenColorIO (OCIO) color management. (in progress)
Cache visualization.
AOV (Arbitrary Output Variable) switching.
Overlay information (frame number, resolution, FPS, metadata).
Snapshot and annotation support.
Pipeline integration with published versions and review notes.

The project is built primarily using

Python 3.10
PySide6
OpenGL
OpenImageIO
PyAV
OCIO
Open USD

This is still an early beta release focused mainly on core architecture, playback workflow, and UI foundations. There is still a lot to improve, but the project has reached a stage where I’m comfortable sharing progress publicly.