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@pneuma-craft/video

v0.6.0

Published

Video engine — decode, composite, preview, export (built on MediaBunny)

Vulnerabilities

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Links

Git

Maintainers

pandazkipandazki

Keywords

pneuma-craftvideovideo-editingmediabunnywebcodecs

Readme

@pneuma-craft/video

Video engine for pneuma-craft — decode, composite, preview, and export. Built on MediaBunny (WebCodecs) for I/O, with self-built Canvas 2D compositor and Web Audio scheduler for playback.

bun add @pneuma-craft/video

What's in here

  • Decoder — MediaBunny Input + CanvasSink / AudioBufferSink
  • Compositor — Canvas 2D layer compositor with transforms, opacity, blend modes
  • Audio scheduler — Web Audio graph with AudioContext.currentTime as master clock; drift-corrected against video
  • Preview engine — drives a rAF loop to play a @pneuma-craft/timeline composition
  • Exporter — renders frame-by-frame via WebCodecs VideoEncoder, mixes audio via OfflineAudioContext, muxes via MediaBunny Output
  • Pluggable subtitle renderer — shared between preview and export

Playback transport semantics

PlaybackEngine follows the HTML media element for the end of the timeline, so a Play button needs no special-casing:

  • The rAF loop pauses at currentTime === duration (unless a loop region is set), and engine.ended becomes true.
  • play() while ended rewinds to 0 and restarts from the top — one clean paused → playing transition, no one-frame flicker.
  • play() on a zero-duration composition is a no-op and leaves state alone.
  • Read engine.ended (mirrored as usePlayback().ended in @pneuma-craft/react) to render a replay affordance instead of comparing currentTime against duration yourself.

Browser support

Requires WebCodecs (VideoDecoder/VideoEncoder) and modern Canvas 2D. Tested on Chromium-based browsers and Safari Tech Preview.

Documentation

See the pneuma-craft repository for the full design spec, architecture, and usage examples.

License

MIT © Pandazki