List of internal modules used by itview. Those that are already implemented as re-usable modules and used outside the itview application are highlighted in blue. All the modules are written in python 2.x unless specified otherwise.

Techstack

• Python, PyQt, Cython, C++, Scala

GUI

• PyQt v4 (PySide compatible)

Viewport

• OpenGL based “layer stack”

Playback Engine

• Timecube (timing module) that takes over the Qt event loop
• Videostreamer, manages read-ahead logic for video and invoking the read codecs
• Audiostreamer, same as videostreamer but for audio

I/O Layer

• OIIO for individual image files (C++)
• FileSequence (C++)
• Understands individual image files for a rendered sequence
• SpMovie (C++)
• Wrapper around third party libraries and internal movie formats (h264, J2K codecs)
• Internal movie file format using J2K with DCP compliant encoding (12 bit depth)
• Ffmpeg based libraries for most third party movie file formats
• MediaCache
• Finds the physical media on disk based on tracking number
• VirtualMedia
• Programmatically generate frames for blackframes, error card, contact sheet, title cards
• Media layer that abstracts all video, audio I/O
• Support pixel probing
• Recognize colorspace, aspect ratio, stereo

Playlist

• Manages a list of clips (media with video and/or audio)
• Clip can have one video and/or audio
• Manages metadata with playlists, clips and the media objects themselves
• Transitions: cross-dissolves and wipes
• Timewarps: customize the order of frames for playback, holding frames, speed changes etc
• Playlist files are in XML format

Database Layer

• Shotgun (Production tracking)
• Edbot (Editorial tracking: proprietary, maybe replaced with OTIO in the future)
• VFO (review notes)
• VnP (Versioning and Publishing - proprietary asset management system)

Annotations

• Supports
• Scribbles with various Brushes, Text, Color Corrections (rectangles, ellipses and lasso)
• Vector format (resolution independent), stored as XML in database
• Internal API for storing and retrieving
• Would be great to move to an interchangeable format+API (OTIO, USD)

Color Pipeline

• OCIO (C++)
• Color correction operations are sent as OCIO requests and rendered
• Aware of display devices being used and will choose the correct look

Misc

• FCurve
• FTGL/Freetype
• FormWidgets
• ResolutionTable
• StereoConvergence

Plugins

• Python based
• Internal “pyCore” module exposes most of core itview functionality to plugins

Messaging

• PyQt signals/slots
• ZeroC ICE api
• Sockets

Remote Sync

• Sync Server (Scala)
• Separate project, written in Scala for high performance
• Itview clients talk to it via ZeroC ICE api protocol
• Manages permissions and access controls for remote users
• Host itview Qt events and API calls are broadcast to remote clients
• Sync sessions provide a “headless itview” with it’s entire state backed by a database
• Public (show based) /private user based sessions as well as internal “context view playlists”
• Aware of editorial information for sequence/shots