diff --git a/packages/producer/src/services/render/stages/captureHdrResources.test.ts b/packages/producer/src/services/render/stages/captureHdrResources.test.ts
index d2c7deda2..2040c665b 100644
--- a/packages/producer/src/services/render/stages/captureHdrResources.test.ts
+++ b/packages/producer/src/services/render/stages/captureHdrResources.test.ts
@@ -26,11 +26,13 @@ import {
   estimateHdrExtractionBytes,
   extractHdrVideoFrames,
   getHdrExtractionReservedBytes,
+  planHdrResources,
   reserveHdrExtractionBytes,
   resolveHdrExtractionActiveBudgetBytes,
   resolveHdrExtractionBudgetBytes,
   resolveHdrExtractionWindow,
 } from "./captureHdrResources.js";
+import type { CompositionMetadata } from "../shared.js";
 
 afterEach(() => {
   vi.unstubAllEnvs();
@@ -115,6 +117,57 @@ function hdrExtractionFixture(videos: VideoElement[], framesDir: string) {
   };
 }
 
+function videoComposition(src: string): CompositionMetadata {
+  return {
+    duration: 5,
+    width: 1920,
+    height: 1080,
+    audios: [],
+    images: [],
+    videos: [{ id: "a-roll", src, start: 0, end: 5, mediaStart: 0, loop: false, hasAudio: false }],
+  };
+}
+
+describe("planHdrResources non-ASCII src resolution (PRINFRA-349)", () => {
+  it("decodes a percent-encoded CJK <video src> back to the real on-disk path", () => {
+    const projectDir = mkdtempSync(join(tmpdir(), "hf-hdr-cjk-"));
+    try {
+      const realName = "视频1.mp4";
+      writeFileSync(join(projectDir, realName), "x");
+      // The compiled DOM carries the URL-encoded attribute value.
+      const encoded = encodeURIComponent(realName); // %E8%A7%86%E9%A2%911.mp4
+      const prep = planHdrResources({
+        composition: videoComposition(encoded),
+        nativeHdrVideoIds: new Set(["a-roll"]),
+        nativeHdrImageIds: new Set(),
+        projectDir,
+        compiledDir: projectDir,
+      });
+      // Must be the decoded filesystem path ffmpeg can open, not the %-encoded string.
+      expect(prep.hdrVideoSrcPaths.get("a-roll")).toBe(join(projectDir, realName));
+    } finally {
+      rmSync(projectDir, { recursive: true, force: true });
+    }
+  });
+
+  it("leaves an ASCII src untouched", () => {
+    const projectDir = mkdtempSync(join(tmpdir(), "hf-hdr-ascii-"));
+    try {
+      writeFileSync(join(projectDir, "clip.mp4"), "x");
+      const prep = planHdrResources({
+        composition: videoComposition("clip.mp4"),
+        nativeHdrVideoIds: new Set(["a-roll"]),
+        nativeHdrImageIds: new Set(),
+        projectDir,
+        compiledDir: projectDir,
+      });
+      expect(prep.hdrVideoSrcPaths.get("a-roll")).toBe(join(projectDir, "clip.mp4"));
+    } finally {
+      rmSync(projectDir, { recursive: true, force: true });
+    }
+  });
+});
+
 describe("estimateHdrExtractionBytes", () => {
   it("sums 6 bytes per pixel per frame across videos", () => {
     // 10s @ 30fps of 1920x1080 = 300 frames * 1920*1080*6
diff --git a/packages/producer/src/services/render/stages/captureHdrResources.ts b/packages/producer/src/services/render/stages/captureHdrResources.ts
index 500e334c7..2a92210e4 100644
--- a/packages/producer/src/services/render/stages/captureHdrResources.ts
+++ b/packages/producer/src/services/render/stages/captureHdrResources.ts
@@ -37,6 +37,7 @@ import {
   queryElementStacking,
   resampleRgb48leObjectFit,
   resolveFinalFrameExtractionWindow,
+  resolveProjectRelativeSrc,
   resolveVideoExtractionWindow,
   runFfmpeg,
   type TimelineExtractionWindow,
@@ -78,7 +79,6 @@ export function planHdrResources(args: {
   nativeHdrImageIds: Set<string>;
   projectDir: string;
   compiledDir: string;
-  existsSync: (p: string) => boolean;
 }): HdrResourcePrep {
   const { composition, nativeHdrVideoIds, nativeHdrImageIds, projectDir, compiledDir } = args;
   const hdrVideoIds = composition.videos
@@ -87,12 +87,14 @@ export function planHdrResources(args: {
   const hdrVideoSrcPaths = new Map<string, string>();
   for (const v of composition.videos) {
     if (!hdrVideoIds.includes(v.id)) continue;
-    let srcPath = v.src;
-    if (!srcPath.startsWith("/")) {
-      const fromCompiled = join(compiledDir, srcPath);
-      srcPath = args.existsSync(fromCompiled) ? fromCompiled : join(projectDir, srcPath);
-    }
-    hdrVideoSrcPaths.set(v.id, srcPath);
+    // Resolve via the shared SDR resolver so a percent-encoded `<video src>`
+    // (`视频1.mp4` → `%E8%A7%86%E9%A2%911.mp4` in the compiled DOM URL) decodes
+    // back to the real on-disk filename before ffmpeg sees it. The old
+    // hand-rolled join passed the encoded string straight through, so HDR
+    // pre-extraction failed with "No such file" on non-ASCII media
+    // (PRINFRA-349 symptom c). resolveProjectRelativeSrc also handles query
+    // strings, origin-root URLs, and `..` traversal identically to the SDR path.
+    hdrVideoSrcPaths.set(v.id, resolveProjectRelativeSrc(v.src, projectDir, compiledDir));
   }
   const hdrVideoStartTimes = new Map<string, number>();
   for (const v of composition.videos) {
diff --git a/packages/producer/src/services/render/stages/captureHdrStage.ts b/packages/producer/src/services/render/stages/captureHdrStage.ts
index d7f168ab2..0b7e769fe 100644
--- a/packages/producer/src/services/render/stages/captureHdrStage.ts
+++ b/packages/producer/src/services/render/stages/captureHdrStage.ts
@@ -202,7 +202,6 @@ export async function runCaptureHdrStage(
     nativeHdrImageIds,
     projectDir,
     compiledDir,
-    existsSync,
   });
 
   const domSession = await createCaptureSession(
diff --git a/packages/producer/src/services/render/stages/extractVideosStage.test.ts b/packages/producer/src/services/render/stages/extractVideosStage.test.ts
index c55fef286..ad73eed40 100644
--- a/packages/producer/src/services/render/stages/extractVideosStage.test.ts
+++ b/packages/producer/src/services/render/stages/extractVideosStage.test.ts
@@ -1,10 +1,14 @@
 import { describe, expect, it } from "vitest";
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
 import type {
   ExtractedFrames,
   ExtractionResult,
   VideoElement,
   VideoExtractionFailure,
 } from "@hyperframes/engine";
+import { resolveProjectRelativeSrc } from "@hyperframes/engine";
 import {
   appendAutoDetectedVideoAudio,
   assertVideoExtractionSucceeded,
@@ -121,6 +125,74 @@ describe("appendAutoDetectedVideoAudio", () => {
   });
 });
 
+// The HDR probes in this stage resolve `<video>`/`<img>` srcs with
+// resolveProjectRelativeSrc and NO isAbsolute() pre-check. These pin the src
+// shapes that a pre-check would silently break — an earlier revision of the
+// PRINFRA-349 fix short-circuited on isAbsolute and left root-relative srcs
+// percent-encoded, so the HDR image never resolved and the render shipped SDR.
+describe("HDR probe src resolution (PRINFRA-349)", () => {
+  it("decodes a percent-encoded CJK src to the real on-disk path", () => {
+    const projectDir = mkdtempSync(join(tmpdir(), "hf-probe-cjk-"));
+    const compiledDir = mkdtempSync(join(tmpdir(), "hf-probe-compiled-"));
+    try {
+      const realName = "图1.png";
+      writeFileSync(join(projectDir, realName), "x");
+      // The compiled DOM carries the URL-encoded attribute value.
+      const encoded = encodeURIComponent(realName); // %E5%9B%BE1.png
+      expect(resolveProjectRelativeSrc(encoded, projectDir, compiledDir)).toBe(
+        join(projectDir, realName),
+      );
+    } finally {
+      rmSync(projectDir, { recursive: true, force: true });
+      rmSync(compiledDir, { recursive: true, force: true });
+    }
+  });
+
+  it("decodes a percent-encoded CJK src served from a browser origin-root URL", () => {
+    // Regression guard: `isAbsolute("/assets/%E5%9B%BE1.png")` is true on POSIX,
+    // so a pre-check would return it verbatim, existsSync would fail, and the
+    // image would never enter nativeHdrImageIds — a silent SDR render.
+    const projectDir = mkdtempSync(join(tmpdir(), "hf-probe-root-"));
+    try {
+      mkdirSync(join(projectDir, "assets"));
+      const realName = "图1.png";
+      writeFileSync(join(projectDir, "assets", realName), "x");
+      const rootRelative = `/assets/${encodeURIComponent(realName)}`;
+      expect(resolveProjectRelativeSrc(rootRelative, projectDir, projectDir)).toBe(
+        join(projectDir, "assets", realName),
+      );
+    } finally {
+      rmSync(projectDir, { recursive: true, force: true });
+    }
+  });
+
+  it("prefers compiledDir over projectDir when both hold the asset", () => {
+    const projectDir = mkdtempSync(join(tmpdir(), "hf-probe-proj-"));
+    const compiledDir = mkdtempSync(join(tmpdir(), "hf-probe-comp-"));
+    try {
+      writeFileSync(join(projectDir, "clip.mp4"), "x");
+      writeFileSync(join(compiledDir, "clip.mp4"), "x");
+      expect(resolveProjectRelativeSrc("clip.mp4", projectDir, compiledDir)).toBe(
+        join(compiledDir, "clip.mp4"),
+      );
+    } finally {
+      rmSync(projectDir, { recursive: true, force: true });
+      rmSync(compiledDir, { recursive: true, force: true });
+    }
+  });
+
+  it("returns an existing absolute path unchanged", () => {
+    const projectDir = mkdtempSync(join(tmpdir(), "hf-probe-abs-"));
+    try {
+      const abs = join(projectDir, "clip.mp4");
+      writeFileSync(abs, "x");
+      expect(resolveProjectRelativeSrc(abs, projectDir, projectDir)).toBe(abs);
+    } finally {
+      rmSync(projectDir, { recursive: true, force: true });
+    }
+  });
+});
+
 describe("shouldCopyExtractedFrames", () => {
   it("copies frames on Windows (symlinkSync throws EPERM without Developer Mode)", () => {
     expect(shouldCopyExtractedFrames("win32")).toBe(true);
diff --git a/packages/producer/src/services/render/stages/extractVideosStage.ts b/packages/producer/src/services/render/stages/extractVideosStage.ts
index c0f0965e3..865134ecd 100644
--- a/packages/producer/src/services/render/stages/extractVideosStage.ts
+++ b/packages/producer/src/services/render/stages/extractVideosStage.ts
@@ -29,7 +29,7 @@
  */
 
 import { existsSync } from "node:fs";
-import { isAbsolute, join } from "node:path";
+import { join } from "node:path";
 import {
   type CaptureVideoMetadataHint,
   type EngineConfig,
@@ -247,6 +247,34 @@ function applyVideoExtractionFailurePolicy(
   return policy.failureMode === "enforce" ? error : null;
 }
 
+/**
+ * Probe a media file's color space, returning null when it can't be read.
+ *
+ * Both HDR probes below widened which files they resolve (PRINFRA-349: the
+ * shared resolver percent-decodes non-ASCII names, so `%E5%9B%BE1.png` now
+ * finds `图1.png`). Files that used to silently fail to resolve are therefore
+ * reachable for the first time — including truncated / 0-byte assets, on which
+ * ffprobe exits non-zero and `extractMediaMetadata` throws. These probes run
+ * inside a bare `Promise.all`, so an unguarded throw aborts the whole render
+ * over one unreadable image. A probe that can't read a file must skip it, not
+ * kill the render.
+ */
+async function probeColorSpaceSafely(
+  path: string,
+  log: ProducerLogger | undefined,
+): Promise<VideoColorSpace | null> {
+  try {
+    const meta = await extractMediaMetadata(path);
+    return meta.colorSpace;
+  } catch (error) {
+    log?.warn("HDR color-space probe failed; treating source as SDR", {
+      path,
+      error: error instanceof Error ? error.message : String(error),
+    });
+    return null;
+  }
+}
+
 export async function runExtractVideosStage(
   input: ExtractVideosStageInput,
 ): Promise<ExtractVideosStageResult> {
@@ -282,14 +310,14 @@ export async function runExtractVideosStage(
     log?.info("Probing video color spaces...", { videoCount: composition.videos.length });
     const probeFailures = await Promise.all(
       composition.videos.map(async (v) => {
-        // Use the shared resolver so a `<video src="../assets/foo">` in a
-        // sub-composition resolves the same way the browser would (see
-        // resolveProjectRelativeSrc in videoFrameExtractor for the full
-        // explanation). isAbsolute (not `startsWith("/")`) so Windows
-        // absolute paths like `C:\...` skip the join correctly.
-        const videoPath = isAbsolute(v.src)
-          ? v.src
-          : resolveProjectRelativeSrc(v.src, projectDir, compiledDir);
+        // Shared resolver so a `<video src="../assets/foo">` in a sub-composition
+        // resolves the same way the browser would, and a percent-encoded
+        // non-ASCII name decodes to its real on-disk path. Called with no
+        // isAbsolute() pre-check: the resolver already returns an absolute path
+        // that exists, and otherwise treats a leading slash as a browser
+        // origin-root URL — pre-checking would hand back `/assets/%E5%9B%BE1.png`
+        // undecoded and re-open PRINFRA-349 for root-relative srcs.
+        const videoPath = resolveProjectRelativeSrc(v.src, projectDir, compiledDir);
         if (!existsSync(videoPath)) return null;
         try {
           // Retries are separately opt-in from the failure gate. With the
@@ -338,21 +366,19 @@ export async function runExtractVideosStage(
   if (job.config.hdrMode !== "force-sdr" && composition.images.length > 0) {
     const probed = await Promise.all(
       composition.images.map(async (img) => {
-        let imgPath = img.src;
-        if (!imgPath.startsWith("/")) {
-          const fromCompiled = existsSync(join(compiledDir, imgPath))
-            ? join(compiledDir, imgPath)
-            : join(projectDir, imgPath);
-          imgPath = fromCompiled;
-        }
+        // Same shared resolver as the video probe above — a percent-encoded
+        // non-ASCII `<img src>` must decode to the on-disk path, or the HDR image
+        // never enters nativeHdrImageIds and the composition silently renders
+        // through the SDR fallback with wrong color (PRINFRA-349 symptom c).
+        const imgPath = resolveProjectRelativeSrc(img.src, projectDir, compiledDir);
         if (!existsSync(imgPath)) return null;
-        const meta = await extractMediaMetadata(imgPath);
-        if (isHdrColorSpace(meta.colorSpace)) {
+        const colorSpace = await probeColorSpaceSafely(imgPath, log);
+        if (isHdrColorSpace(colorSpace)) {
           nativeHdrImageIds.add(img.id);
-          imageTransfers.set(img.id, detectTransfer(meta.colorSpace));
+          imageTransfers.set(img.id, detectTransfer(colorSpace));
           hdrImageSrcPaths.set(img.id, imgPath);
         }
-        return meta.colorSpace;
+        return colorSpace;
       }),
     );
     imageColorSpaces.push(...probed);