Variable WorkerConfigConst

Type Declaration

• imageWorkerUrl: string

  URL to image.worker.js

• audioWorkerUrl: string

  URL to audio.worker.js

• videoWorkerUrl: string

  URL to video.worker.js

• ffmpegCoreUrl: string

  URL to ffmpeg-core.js (or ffmpeg-core-mt.js if SharedArrayBuffer is supported)

• ffmpegWasmUrl: string

  URL to ffmpeg-core.wasm

• ffmpegWorkerUrl: string

  URL to ffmpeg-core.worker.js (required for multi-threading)

• mainThreadThreshold: number

  Threshold (in bytes) for bypassing Web Workers to avoid communication overhead. Files smaller than this will run on the main thread for lower latency. Default: 4MB (4 * 1024 * 1024). Set to 0 to always use Web Workers.

• avifMainThreadThreshold: number

  Threshold (in bytes) for AVIF main-thread execution. Set to Infinity so AVIF always runs on the main thread via @jsquash/avif. @ffmpeg/core-mt excludes libaom-av1, so routing AVIF to the FFmpeg heavy path in a Worker always fails. @jsquash/avif handles multi-threading internally (via its own sub-workers) when SharedArrayBuffer is available.

• audioMainThreadThreshold: number

  Threshold (in bytes) for WAV audio fast-path execution on the main thread. WebCodecs AudioEncoder is CPU-intensive per byte — use a lower limit than images. Non-WAV inputs always bypass the main thread (fast path only decodes WAV). Default: 1MB (1 * 1024 * 1024).

• warmWorkerThreshold: number

  When a Worker is already warm (loaded within the idle window), cold-start cost is gone. Only postMessage overhead (~1 ms) remains. Use this lower threshold instead of per-engine cold thresholds. Default: 512KB (512 * 1024).