diff --git a/packages/engine/src/config.test.ts b/packages/engine/src/config.test.ts
index 383b7f4b4..4e39137f4 100644
--- a/packages/engine/src/config.test.ts
+++ b/packages/engine/src/config.test.ts
@@ -7,6 +7,7 @@ import {
   scaleProtocolTimeoutForComposition,
   shouldClampToScreenshotForConcreteGpu,
   applyConcreteGpuScreenshotClamp,
+  shouldAutoDisableStreamingEncodeOnWin32Compound,
 } from "./config.js";
 import type { EngineConfig } from "./config.js";
 import { isLowMemorySystem } from "./services/systemMemory.js";
@@ -518,6 +519,216 @@ describe("resolveConfig", () => {
     });
   });
 
+  describe("shouldAutoDisableStreamingEncodeOnWin32Compound (helper)", () => {
+    // Baseline: field-signal compound — win32 + software-GPU forced + workers=1,
+    // duration unknown, user hasn't touched the env / overrides.
+    const compound = {
+      platform: "win32" as NodeJS.Platform,
+      softwareGpuForced: true,
+      workers: 1,
+      compositionDurationSec: undefined as number | undefined,
+      userExplicitlySet: false,
+    };
+
+    it("triggers on the field-signal compound (win32 + software-GPU + workers=1)", () => {
+      expect(shouldAutoDisableStreamingEncodeOnWin32Compound(compound)).toBe(true);
+    });
+
+    it("does NOT trigger on linux or darwin (platform gate)", () => {
+      expect(
+        shouldAutoDisableStreamingEncodeOnWin32Compound({ ...compound, platform: "linux" }),
+      ).toBe(false);
+      expect(
+        shouldAutoDisableStreamingEncodeOnWin32Compound({ ...compound, platform: "darwin" }),
+      ).toBe(false);
+    });
+
+    it("does NOT trigger without software-GPU forced (bypass on hardware paths)", () => {
+      expect(
+        shouldAutoDisableStreamingEncodeOnWin32Compound({ ...compound, softwareGpuForced: false }),
+      ).toBe(false);
+    });
+
+    it("does NOT trigger with parallel workers (workers > 1 has a different failure surface)", () => {
+      expect(shouldAutoDisableStreamingEncodeOnWin32Compound({ ...compound, workers: 2 })).toBe(
+        false,
+      );
+      expect(shouldAutoDisableStreamingEncodeOnWin32Compound({ ...compound, workers: 4 })).toBe(
+        false,
+      );
+    });
+
+    it("does NOT trigger when the user explicitly set enableStreamingEncode (escape hatch)", () => {
+      expect(
+        shouldAutoDisableStreamingEncodeOnWin32Compound({ ...compound, userExplicitlySet: true }),
+      ).toBe(false);
+    });
+
+    it("does NOT trigger for short (<=120s) compositions when duration is known", () => {
+      // 120s boundary is off (edge)
+      expect(
+        shouldAutoDisableStreamingEncodeOnWin32Compound({
+          ...compound,
+          compositionDurationSec: 120,
+        }),
+      ).toBe(false);
+      // 60s — clearly short, off
+      expect(
+        shouldAutoDisableStreamingEncodeOnWin32Compound({
+          ...compound,
+          compositionDurationSec: 60,
+        }),
+      ).toBe(false);
+    });
+
+    it("triggers when duration is known and exceeds 120s (heavy Windows composition)", () => {
+      // 121s — just past the boundary, on
+      expect(
+        shouldAutoDisableStreamingEncodeOnWin32Compound({
+          ...compound,
+          compositionDurationSec: 121,
+        }),
+      ).toBe(true);
+      // 156s — matches the field signal, on
+      expect(
+        shouldAutoDisableStreamingEncodeOnWin32Compound({
+          ...compound,
+          compositionDurationSec: 156,
+        }),
+      ).toBe(true);
+    });
+
+    it("triggers when duration is undefined (config-layer wire-up reduces to 3-cond)", () => {
+      // resolveConfig can't see composition duration at config time; the
+      // three-condition compound is conservative on its own.
+      expect(
+        shouldAutoDisableStreamingEncodeOnWin32Compound({
+          ...compound,
+          compositionDurationSec: undefined,
+        }),
+      ).toBe(true);
+    });
+  });
+
+  describe("enableStreamingEncode (Windows compound auto-disable wire-up)", () => {
+    const originalPlatform = process.platform;
+
+    function setPlatform(platform: NodeJS.Platform) {
+      Object.defineProperty(process, "platform", { value: platform, configurable: true });
+    }
+
+    afterEach(() => {
+      Object.defineProperty(process, "platform", { value: originalPlatform, configurable: true });
+    });
+
+    it("auto-disables on win32 + software-GPU + workers=1 + no user opt-in", () => {
+      setPlatform("win32");
+      setEnv("PRODUCER_BROWSER_GPU_MODE", "software");
+      setEnv("PRODUCER_MAX_WORKERS", "1");
+      setEnv("PRODUCER_LOW_MEMORY_MODE", "true");
+      unsetEnv("PRODUCER_ENABLE_STREAMING_ENCODE");
+
+      const config = resolveConfig();
+      expect(config.enableStreamingEncode).toBe(false);
+      expect(config.streamingEncodeAutoDisabledOnWin32Compound).toBe(true);
+    });
+
+    it("leaves streaming-encode on when platform is linux", () => {
+      setPlatform("linux");
+      setEnv("PRODUCER_BROWSER_GPU_MODE", "software");
+      setEnv("PRODUCER_MAX_WORKERS", "1");
+      setEnv("PRODUCER_LOW_MEMORY_MODE", "true");
+      unsetEnv("PRODUCER_ENABLE_STREAMING_ENCODE");
+
+      const config = resolveConfig();
+      expect(config.enableStreamingEncode).toBe(true);
+      expect(config.streamingEncodeAutoDisabledOnWin32Compound).toBeUndefined();
+    });
+
+    it("leaves streaming-encode on when workers > 1", () => {
+      setPlatform("win32");
+      setEnv("PRODUCER_BROWSER_GPU_MODE", "software");
+      setEnv("PRODUCER_MAX_WORKERS", "4");
+      setEnv("PRODUCER_LOW_MEMORY_MODE", "true");
+      unsetEnv("PRODUCER_ENABLE_STREAMING_ENCODE");
+
+      const config = resolveConfig();
+      expect(config.enableStreamingEncode).toBe(true);
+      expect(config.streamingEncodeAutoDisabledOnWin32Compound).toBeUndefined();
+    });
+
+    it("respects explicit env opt-in (PRODUCER_ENABLE_STREAMING_ENCODE=true) on the compound", () => {
+      setPlatform("win32");
+      setEnv("PRODUCER_BROWSER_GPU_MODE", "software");
+      setEnv("PRODUCER_MAX_WORKERS", "1");
+      setEnv("PRODUCER_LOW_MEMORY_MODE", "true");
+      setEnv("PRODUCER_ENABLE_STREAMING_ENCODE", "true");
+
+      const config = resolveConfig();
+      expect(config.enableStreamingEncode).toBe(true);
+      expect(config.streamingEncodeAutoDisabledOnWin32Compound).toBeUndefined();
+    });
+
+    it("respects programmatic override enableStreamingEncode=true on the compound", () => {
+      setPlatform("win32");
+      setEnv("PRODUCER_BROWSER_GPU_MODE", "software");
+      setEnv("PRODUCER_MAX_WORKERS", "1");
+      setEnv("PRODUCER_LOW_MEMORY_MODE", "true");
+      unsetEnv("PRODUCER_ENABLE_STREAMING_ENCODE");
+
+      const config = resolveConfig({ enableStreamingEncode: true });
+      expect(config.enableStreamingEncode).toBe(true);
+      expect(config.streamingEncodeAutoDisabledOnWin32Compound).toBeUndefined();
+    });
+
+    it("triggers via disableGpu on win32 + workers=1 (browserGpuMode may still be 'auto')", () => {
+      // --disable-gpu path: browserGpuMode may not be literal "software" but
+      // Chrome is still routed to CPU raster. Field-signal compound applies.
+      setPlatform("win32");
+      unsetEnv("PRODUCER_BROWSER_GPU_MODE");
+      setEnv("PRODUCER_DISABLE_GPU", "true");
+      setEnv("PRODUCER_MAX_WORKERS", "1");
+      unsetEnv("PRODUCER_LOW_MEMORY_MODE");
+      unsetEnv("PRODUCER_ENABLE_STREAMING_ENCODE");
+
+      const config = resolveConfig();
+      expect(config.enableStreamingEncode).toBe(false);
+      expect(config.streamingEncodeAutoDisabledOnWin32Compound).toBe(true);
+    });
+
+    it("triggers via lowMemoryMode alone on win32 + workers=1 (screenshot capture implied)", () => {
+      // --low-memory-mode implies screenshot capture. Compound applies even
+      // if browserGpuMode is not literal "software" (defense-in-depth: matches
+      // the OR semantics in `softwareGpuForced`).
+      setPlatform("win32");
+      unsetEnv("PRODUCER_BROWSER_GPU_MODE");
+      unsetEnv("PRODUCER_DISABLE_GPU");
+      setEnv("PRODUCER_MAX_WORKERS", "1");
+      setEnv("PRODUCER_LOW_MEMORY_MODE", "true");
+      unsetEnv("PRODUCER_ENABLE_STREAMING_ENCODE");
+
+      const config = resolveConfig();
+      expect(config.enableStreamingEncode).toBe(false);
+      expect(config.streamingEncodeAutoDisabledOnWin32Compound).toBe(true);
+    });
+
+    it("does not trigger when concurrency is 'auto' (workers not explicitly pinned)", () => {
+      // Config-layer sees `concurrency === "auto"`, not a number — the
+      // helper's numeric workers check treats NaN as "unknown, don't trigger".
+      // Downstream workers may still resolve to 1 via lowMemoryMode, but the
+      // config-time clamp is deliberately conservative.
+      setPlatform("win32");
+      setEnv("PRODUCER_BROWSER_GPU_MODE", "software");
+      unsetEnv("PRODUCER_MAX_WORKERS");
+      setEnv("PRODUCER_LOW_MEMORY_MODE", "true");
+      unsetEnv("PRODUCER_ENABLE_STREAMING_ENCODE");
+
+      const config = resolveConfig();
+      expect(config.enableStreamingEncode).toBe(true);
+      expect(config.streamingEncodeAutoDisabledOnWin32Compound).toBeUndefined();
+    });
+  });
+
   describe("lowMemoryMode", () => {
     it("forces on for truthy PRODUCER_LOW_MEMORY_MODE values", () => {
       setEnv("PRODUCER_LOW_MEMORY_MODE", "true");
diff --git a/packages/engine/src/config.ts b/packages/engine/src/config.ts
index bb12af59a..b4e069175 100644
--- a/packages/engine/src/config.ts
+++ b/packages/engine/src/config.ts
@@ -150,6 +150,15 @@ export interface EngineConfig {
   enableChunkedEncode: boolean;
   chunkSizeFrames: number;
   enableStreamingEncode: boolean;
+  /**
+   * INTERNAL. Set by `resolveConfig` when the Windows software-GPU compound
+   * heuristic (`shouldAutoDisableStreamingEncodeOnWin32Compound`) turned
+   * `enableStreamingEncode` off on the caller's behalf. Not intended to be
+   * set by callers; surfaces the auto-decision for downstream observability
+   * (log lines, telemetry) so operators can tell an auto-disable apart from
+   * an explicit user opt-out.
+   */
+  streamingEncodeAutoDisabledOnWin32Compound?: boolean;
   /**
    * Max composition duration eligible for streaming encode (seconds).
    * Mirrors GSAP rendering's 4-minute streaming guard: production has seen
@@ -355,6 +364,62 @@ export function scaleProtocolTimeoutForComposition(
   return Math.min(ceiling, Math.max(baseTimeoutMs, scaled));
 }
 
+/**
+ * Auto-disable `enableStreamingEncode` on Windows software-GPU compound.
+ *
+ * Field signal (`ts=1784131903`, win32/x64, CLI 0.7.58, 156s UI-heavy
+ * composition): the render was stable ONLY with FOUR flags together —
+ * `--workers 1 --no-browser-gpu --low-memory-mode` + explicit
+ * `PRODUCER_ENABLE_STREAMING_ENCODE=false`. Every recent Windows-related
+ * fix (#2359, #2245, #2298, #2331) already shipped in 0.7.58; the residual
+ * failure is screenshot streaming-encode via CDP `Page.captureScreenshot`
+ * on Windows even after software fallback. Since `--low-memory-mode` and
+ * `--no-browser-gpu` already imply screenshot capture, three of the four
+ * flags are structurally coupled — auto-detect the compound and disable
+ * streaming-encode automatically so callers don't have to memorize the
+ * four-flag combination.
+ *
+ * Conservative gates (all must hold):
+ *   1. `platform === "win32"` — the failure is Windows-specific to CDP's
+ *      screenshot streaming path.
+ *   2. `softwareGpuForced` — the render is already on the SwiftShader /
+ *      forced-screenshot path (from `--no-browser-gpu`, `disableGpu`, or
+ *      `--low-memory-mode` implying screenshot capture).
+ *   3. `workers === 1` — the field signal reproduces on single-worker
+ *      captures; parallel workers have a different failure surface
+ *      (missing media frames) already handled by the worker-count route.
+ *   4. Composition duration >120s WHEN KNOWN. When unknown at the config
+ *      layer (composition duration is parsed downstream), the guard
+ *      reduces to the three-condition compound. Trade-off documented in
+ *      the PR body: false positives possible for short (~<120s) Windows
+ *      software-GPU single-worker renders. Mitigation: the explicit
+ *      opt-in escape hatch (`PRODUCER_ENABLE_STREAMING_ENCODE=true` or
+ *      `overrides.enableStreamingEncode !== undefined`) always wins.
+ *
+ * Pure function; exported for tests.
+ */
+export function shouldAutoDisableStreamingEncodeOnWin32Compound(opts: {
+  platform: NodeJS.Platform;
+  softwareGpuForced: boolean;
+  workers: number;
+  compositionDurationSec: number | undefined;
+  userExplicitlySet: boolean;
+}): boolean {
+  if (opts.userExplicitlySet) return false;
+  if (opts.platform !== "win32") return false;
+  if (!opts.softwareGpuForced) return false;
+  // Strict equality: NaN (concurrency: "auto") and fractional / zero worker
+  // counts do NOT match. The field-signal compound is `--workers 1`.
+  if (opts.workers !== 1) return false;
+  // Duration boundary: when known, only auto-disable if >120s (avoid
+  // over-triggering on short renders). When unknown, skip this check —
+  // the three conditions above are already conservative on their own.
+  if (opts.compositionDurationSec !== undefined && opts.compositionDurationSec <= 120) {
+    return false;
+  }
+  return true;
+}
+
 function memoryAdaptiveCacheLimit(): number {
   const total = getSystemTotalMb();
   if (total < 4096) return 32;
@@ -608,6 +673,52 @@ export function resolveConfig(overrides?: Partial<EngineConfig>): EngineConfig {
     merged.forceScreenshot = true;
   }
 
+  // Windows software-GPU compound auto-disable for streaming-encode.
+  //
+  // Field signal ts=1784131903 (win32/x64, CLI 0.7.58, 156s UI-heavy):
+  // stable ONLY with FOUR flags — `--workers 1 --no-browser-gpu
+  // --low-memory-mode` + `PRODUCER_ENABLE_STREAMING_ENCODE=false`. Since
+  // `--no-browser-gpu` and `--low-memory-mode` already imply screenshot
+  // capture, three of the four flags are structurally coupled: auto-detect
+  // the compound and disable streaming-encode on the caller's behalf.
+  //
+  // Explicit user intent wins: if `PRODUCER_ENABLE_STREAMING_ENCODE` env
+  // is set to any value OR the caller passed `overrides.enableStreamingEncode`,
+  // this clamp is a no-op (the user's explicit choice — including
+  // `PRODUCER_ENABLE_STREAMING_ENCODE=true` — is preserved).
+  //
+  // Composition duration is not known at the config-resolution layer
+  // (the composition is parsed downstream of `resolveConfig`), so this
+  // wire-up passes `compositionDurationSec: undefined` and the helper
+  // reduces to the three-condition compound. Trade-off documented in the
+  // helper's JSDoc and the PR body: false positives possible for short
+  // Windows software-GPU single-worker renders; the explicit opt-in
+  // escape hatch is the mitigation.
+  const streamingEncodeUserExplicitlySet =
+    env("PRODUCER_ENABLE_STREAMING_ENCODE") !== undefined ||
+    overrides?.enableStreamingEncode !== undefined;
+  const softwareGpuForced =
+    merged.browserGpuMode === "software" || merged.disableGpu || merged.lowMemoryMode;
+  const resolvedWorkers = typeof merged.concurrency === "number" ? merged.concurrency : NaN;
+  if (
+    merged.enableStreamingEncode &&
+    shouldAutoDisableStreamingEncodeOnWin32Compound({
+      platform: process.platform,
+      softwareGpuForced,
+      workers: resolvedWorkers,
+      compositionDurationSec: undefined,
+      userExplicitlySet: streamingEncodeUserExplicitlySet,
+    })
+  ) {
+    merged.enableStreamingEncode = false;
+    merged.streamingEncodeAutoDisabledOnWin32Compound = true;
+    console.error(
+      "[hyperframes] Windows compound-workaround auto-detected — disabling streaming-encode " +
+        "(platform=win32, software-GPU forced, workers=1). Field signal ts=1784131903. " +
+        "Override: PRODUCER_ENABLE_STREAMING_ENCODE=true.",
+    );
+  }
+
   // drawElement capture and page-side shader compositing are mutually
   // incompatible capture strategies (drawElement reads paint records directly
   // and bypasses the page-side prepare→composite→resolve protocol). When