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Fix transcription failure after Windows screen lock (#39) - #41
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WebGPU OrtRun fails with "Failed to download data from buffer" when the GPU instance is torn down (common on Windows lock). Detect that class of errors and continue the current speech segment on WASM instead of aborting. Co-authored-by: Wassim Gharbi <wassgha@gmail.com>
Keep getAsr close to the original shape, and express mid-run GPU loss as a single try/catch retry around each speech slice instead of nested attempt loops. Co-authored-by: Wassim Gharbi <wassgha@gmail.com>
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July 30, 2026 06:52
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Summary
Fixes #39: when transcription is running on WebGPU and Windows locks the screen, Chromium tears down the GPU instance. ONNX Runtime then fails with
Failed to download data from buffer/A valid external Instance reference no longer exists, and the job aborts.This change detects that class of WebGPU device-loss errors mid-transcription, reloads Whisper on WASM, and retries the current speech segment so the run can finish instead of surfacing a raw OrtRun error.
Changes
isWebGpuDeviceLostError()(lib/webgpu.ts) matching the OrtRun /mapAsyncfailure from the issuegetAsr()close to its original shape; trackforceWasm/asrDevicefor fallbackscripts/webgpu-test.tsTest plan
npx tsx scripts/webgpu-test.tseslinton touched filestsc --noEmit