ossia score is a sequencer for audio-visual artists, designed to create interactive shows.

Sequence OSC, MIDI, DMX, sound, video and more, between multiple software and hardware. Create interactive and intermedia scores, script and live-code with JavaScript, ISF Shaders, Faust, PureData or C++. Leverage IoT protocols such as CoAP or MQTT, interact with joysticks, Wiimotes, Leapmotions, Web APIs and BLE sensors and integrate programs from a wealth of creative programming languages such as Structure Synth, Context-Free Art and Bytebeat. Load any kind of audio or video format and process visuals through Spout, Syphon, NDI, Shmdata or Sh4lt ; sonify large datasets with CSV and HDF5 support.

ossia score 3.8.1 brings major video improvements, video mapping features, HDR support, full backwards playback, and many bug fixes.

Full Changelog: v3.8.0...v3.8.1

New features

• video: massive hardware decoding rework with D3D12 and Vulkan Video backends, thanks to FFMPEG. True zero-copy for Vulkan Video -> Vulkan render pipeline and VideoToolbox -> Metal ; 1 GPU copy otherwise.
• video: finish the implementation for GPU-accelerated rendering of pretty much every useful YUV format in existence: UYVY422, VUYA, XV30, Y210, YUV420, YUV420P10, YUV420P12, YUV422, YUV422P10, YUV422P12, YUV440, YUV444, YUV444P10, YUV444P12, YUVA420, YUVA444, YUVA444P10, YUVA444P12, YUYV422, ...
• time ruler: implement scrubbing by double-clicking and dragging.

• video: added automatic mode to pick the best hardware decoder for a given task.
• video: HDR support for Window output (tested on macOS and Windows).
• video: HDR shaders added to user library: tonemapping, exposure, OETF, etc.
• video: rework of color processing, proper support for full range MPEG, fix Cineform support
• video: hardware-decoded DXV
• video: add a direct synchronous playback option for formats that support it (HAP, DXV and other all-I formats)
• video: add .ts as acceptable extension
• video: add a multi-window output mode to handle multi-projector mapping, with soft-edge blending and warping.

• scenario: allow backwards playback
• process: add a VU meter object for audio visualization

• process: add a video mapper (rect-mapper) object in the user library for mapping multiple textures in one viewport.

• process: add an advanced-text object in the user library for fancy text rendering.

• process: add a presentation object in the user library because what use is a graphics software which isn't even able to render slides.

• isf: initial infrastructure for cubemap textures
• network: add a debug log panel to HTTP, WebSocket, etc.

• js: add Util.environmentVariable(), Util.timestamp(), file info utility functions
• js: add API functions for working with TimeVal
• js: add a positionChanged signal for UIs ; implement Score.scrub(milliseconds)
• js: store a path to allow processes that have local file dependencies to retrieve them ; enables creating advanced QML objects with multiple files.
• js: give access to Util in JSProcessModel
• mapper: add support for adding framing (SLIP, etc.) to stream-based protocols such as TCP
• cli: js: allow to run a script on startup with --script
• gfx: add infrastructure to allow objects to fetch a texture from a previous node instead of being rendered into
• ui: allow to disable the UI updates during execution for low power systems
• core: add SCORE_PRETTIFY_JSON=1 environment variable to save JSON indented
• tools: add a git update tool

Improvements

• ui: improve styling for Qt Quick objects
• ui: make it easier to start a drag from a port which already has a cable
• ui: make port labels clickable
• video: improve thumbnail computations and seeking logic
• video: better heuristics for direct video playback
• video: use software decoding as far as possible for thumbnails
• js: use Basic style for QML UIs to match score style
• js: force update of items on each tick to ensure View3D updates correctly
• create-app: include assets from score file directory in create-app scripts for all platforms. Thanks @ogauthiersat!
• 3rdparty: broad library update
• ci: update to SDK 36 (FFmpeg 8.1)
• msvc: update to VS2026

Bugfixes

• ui: fix that library download check had been moved to opening the settings UI
• ui: fix wrong condition to check whether value input is some binary string
• ui: fix scroll in timeline view scrolling the interior of nodal views
• metal/d3d: fix background texture inverted. Fixes #1968
• exec: fix looping when playing backwards
• scenario: drop on cable: fix crash when a node would be changed in a separate slot upon drag and drop
• video: fix IgnoreTempo property read missing regression. Thanks @ogauthiersat!
• video decoder: add a missing flush
• lfo: fix phase in quantified mode
• lfo: fix phase missing a multiplication by pi
• js: fix state not restoring on graph change
• js: fix using background textures from QML in hidden views
• js: fix a QtQuick3D deletion order issue
• js: fix passing paths that have LIBRARY: or PROJECT: prefixes
• js: GPU node fixes for state handling
• qml: put the ASIO state in a separate thread-safe object to prevent concurrency issues in mapper device
• qml: set simpler environment for Python support
• coremidi: fix observer not being initialized
• core: fix settings crash on close
• core: make the settings children of qApp so that JS engine does not appropriate them
• ports: fix changing between ControlInlet and ValueInlet at runtime for e.g. JS script
• avnd: variable ports: fix missing resize of intermediary buffers
• avnd: increase resiliency against 0 I/O channels ; fix order of calls for channel allocation
• avnd: fix that buffers were only up to 31 bit size, instead of 32. 4GB buffers are now possible if the GPU handles it.
• gfx: prevent a node that has been just removed to be added again as a preview node
• gfx: null check fix in buffer release
• preview: fix gamma blending
• model display: fix that preview had broken
• fft: kfr: fix an issue with deallocation
• linux: fix missing avahi-daemon program warning on some distros. Thanks @ogauthiersat!
• tools: fix missing line feed in mac custom app launcher environment. Thanks @ogauthiersat!
• core: prevent dummy warning with Clang 22 on each COUNTER