diff --git a/examples/diffusers/Dockerfile.dreamverse b/examples/diffusers/Dockerfile.dreamverse
index c161352ebb3a..bec0f90760d6 100644
--- a/examples/diffusers/Dockerfile.dreamverse
+++ b/examples/diffusers/Dockerfile.dreamverse
@@ -36,14 +36,17 @@ RUN . /opt/venv/bin/activate \
 # the exact commit these patches were authored against, so they apply clean.
 COPY patches/ltx23_gpu_worker_megacache.patch /tmp/megacache.patch
 COPY patches/x264-threads-cap.patch /tmp/x264-threads-cap.patch
+COPY patches/pyav-scenecut.patch /tmp/pyav-scenecut.patch
 # NOTE: verify by grepping the patched source, NOT by importing fastvideo --
 # importing pulls in triton, which fails to init its driver in a GPU-less build
 # ("0 active drivers").
 RUN SP=/opt/venv/lib/python3.12/site-packages \
  && patch -p1 -d "$SP" --forward --fuzz=0 < /tmp/megacache.patch \
  && patch -p1 -d "$SP" --forward --fuzz=0 < /tmp/x264-threads-cap.patch \
+ && patch -p1 -d "$SP" --forward --fuzz=0 < /tmp/pyav-scenecut.patch \
  && grep -q 'torch.compiler.load_cache_artifacts' "$SP/fastvideo/worker/gpu_worker.py" \
  && grep -q 'FASTVIDEO_X264_THREADS' "$SP/fastvideo/entrypoints/video_generator.py" \
+ && grep -q 'FASTVIDEO_X264_SCENECUT' "$SP/fastvideo/entrypoints/video_generator.py" \
  && echo "patches applied + verified"
 
 ENV FASTVIDEO_VIDEO_CODEC=libx264
diff --git a/examples/diffusers/patches/pyav-scenecut.patch b/examples/diffusers/patches/pyav-scenecut.patch
new file mode 100644
index 000000000000..79d003e5d7ab
--- /dev/null
+++ b/examples/diffusers/patches/pyav-scenecut.patch
@@ -0,0 +1,17 @@
+diff --git a/fastvideo/entrypoints/video_generator.py b/fastvideo/entrypoints/video_generator.py
+index bfc1633..ef4f213 100644
+--- a/fastvideo/entrypoints/video_generator.py
++++ b/fastvideo/entrypoints/video_generator.py
+@@ -1010,6 +1010,12 @@ class VideoGenerator:
+             video_stream.options = {
+                 "preset": "ultrafast",
+                 "tune": "zerolatency",
++                # Skip x264's scene-cut cost analysis: a pure encode-speed lever
++                # with no quality/compat effect for our fixed-GOP single-file
++                # output. Env-configurable (mirrors FASTVIDEO_X264_THREADS /
++                # FASTVIDEO_X264_PRESET below) so it's opt-out per model without
++                # a rebuild. Measured ~50-100ms/clip (deepinfra, 2026-07-07).
++                "x264-params": f"scenecut={os.getenv('FASTVIDEO_X264_SCENECUT', '0')}",
+             }
+ 
+             audio_stream = output.add_stream("aac", rate=sample_rate, layout=layout)