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Keep the e2e harness preview playing across processor changes #147

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Merged
changt merged 1 commit into from
Oct 21, 2026
Merged

Keep the e2e harness preview playing across processor changes #147

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15 changes: 13 additions & 2 deletions examples/e2e/ui.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -30,10 +30,21 @@ export function buildUi(harness: E2EHarness, render: () => void) {
});
};

// Assigning srcObject restarts the element, which shows black until the next frame, so the
// preview keeps one stream and only swaps its track when the track itself changes.
const previewStream = new MediaStream();
const refreshPreview = () => {
const track = media.processedVideoTrack();
preview.srcObject = track ? new MediaStream([track]) : null;
if (track) void preview.play().catch(() => undefined);
const [current] = previewStream.getVideoTracks();
if (track === current) return;
if (current) previewStream.removeTrack(current);
if (!track) {
preview.srcObject = null;
return;
}
previewStream.addTrack(track);
if (preview.srcObject !== previewStream) preview.srcObject = previewStream;
void preview.play().catch(() => undefined);
};
media.onChange(refreshPreview);

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