diff --git a/packages/engine/src/services/videoFrameExtractor.test.ts b/packages/engine/src/services/videoFrameExtractor.test.ts
index 22b56e119..49d92103c 100644
--- a/packages/engine/src/services/videoFrameExtractor.test.ts
+++ b/packages/engine/src/services/videoFrameExtractor.test.ts
@@ -20,6 +20,7 @@ import {
   resolveProjectRelativeSrc,
   codecMayHaveAlpha,
   decoderForCodec,
+  getFrameAtTime,
   type VideoElement,
   type ExtractedFrames,
 } from "./videoFrameExtractor.js";
@@ -704,3 +705,61 @@ describe.skipIf(!HAS_FFMPEG)("extractAllVideoFrames on a VFR source", () => {
     expect(duplicateRate).toBeLessThan(0.1);
   }, 60_000);
 });
+
+describe("getFrameAtTime — IEEE 754 boundary precision", () => {
+  function makeExtracted(fps: number, totalFrames: number): ExtractedFrames {
+    const framePaths = new Map<number, string>();
+    for (let i = 0; i < totalFrames; i++) framePaths.set(i, `frame-${i}.jpg`);
+    return {
+      fps,
+      totalFrames,
+      framePaths,
+      metadata: {
+        durationSeconds: totalFrames / fps,
+        width: 1920,
+        height: 1080,
+        codec: "h264",
+        hasAudio: false,
+        fps,
+      },
+    } as ExtractedFrames;
+  }
+
+  it("does not produce duplicate frames when data-start is grid-aligned", () => {
+    const extracted = makeExtracted(25, 351);
+    const videoStart = 0;
+    const seen: string[] = [];
+    let duplicates = 0;
+    for (let i = 0; i < 351; i++) {
+      const globalTime = i / 25;
+      const frame = getFrameAtTime(extracted, globalTime, videoStart);
+      if (frame && seen.length > 0 && frame === seen[seen.length - 1]) duplicates++;
+      if (frame) seen.push(frame);
+    }
+    expect(duplicates).toBe(0);
+  });
+
+  it("returns monotonically increasing frame indices", () => {
+    const extracted = makeExtracted(25, 100);
+    let lastIndex = -1;
+    for (let i = 0; i < 100; i++) {
+      const globalTime = i / 25;
+      const frame = getFrameAtTime(extracted, globalTime, 0);
+      const idx = frame ? parseInt(frame.split("-")[1]!) : -1;
+      expect(idx).toBeGreaterThan(lastIndex);
+      lastIndex = idx;
+    }
+  });
+
+  it("handles the 0.28 * 25 boundary case (6.999999 vs 7)", () => {
+    const extracted = makeExtracted(25, 10);
+    const frame = getFrameAtTime(extracted, 0.28, 0);
+    expect(frame).toBe("frame-7.jpg");
+  });
+
+  it("mediaStart does not offset frame index (extractor handles trim via -ss)", () => {
+    const extracted = makeExtracted(25, 100);
+    const frame = getFrameAtTime(extracted, 0, 0, false, 1.0);
+    expect(frame).toBe("frame-0.jpg");
+  });
+});
diff --git a/packages/engine/src/services/videoFrameExtractor.ts b/packages/engine/src/services/videoFrameExtractor.ts
index 096dd6b5c..22a9c7658 100644
--- a/packages/engine/src/services/videoFrameExtractor.ts
+++ b/packages/engine/src/services/videoFrameExtractor.ts
@@ -934,7 +934,9 @@ export function getFrameAtTime(
   if (loop && loopDuration > 0 && localTime >= loopDuration) {
     localTime %= loopDuration;
   }
-  const frameIndex = Math.floor(localTime * extracted.fps);
+  // Add epsilon before flooring to avoid IEEE 754 boundary errors where
+  // e.g. 0.28 * 25 === 6.999999999999999 instead of 7.
+  const frameIndex = Math.floor(localTime * extracted.fps + 1e-9);
   if (loop && frameIndex >= extracted.totalFrames && extracted.totalFrames > 0) {
     return extracted.framePaths.get(extracted.totalFrames - 1) || null;
   }
@@ -1044,7 +1046,7 @@ export class FrameLookupTable {
       if (video.loop && loopDuration > 0 && localTime >= loopDuration) {
         localTime %= loopDuration;
       }
-      const frameIndex = Math.floor(localTime * video.extracted.fps);
+      const frameIndex = Math.floor(localTime * video.extracted.fps + 1e-9);
       if (video.loop && frameIndex >= video.extracted.totalFrames) {
         const framePath = video.extracted.framePaths.get(video.extracted.totalFrames - 1);
         if (framePath) {
diff --git a/packages/producer/node_modules/.vite/vitest/da39a3ee5e6b4b0d3255bfef95601890afd80709/results.json b/packages/producer/node_modules/.vite/vitest/da39a3ee5e6b4b0d3255bfef95601890afd80709/results.json
deleted file mode 100644
index 06e7b51d0..000000000
--- a/packages/producer/node_modules/.vite/vitest/da39a3ee5e6b4b0d3255bfef95601890afd80709/results.json
+++ /dev/null
@@ -1 +0,0 @@
-{"version":"4.1.4","results":[[":src/utils/paths.test.ts",{"duration":10.026583000000016,"failed":false}],[":src/services/renderOrchestrator.test.ts",{"duration":12.886541999999963,"failed":false}],[":src/services/htmlCompiler.test.ts",{"duration":0,"failed":true}],[":src/services/hyperframeRuntimeLoader.test.ts",{"duration":27.842709000000013,"failed":false}]]}
\ No newline at end of file