diff --git a/sexp_effects/primitive_libs/streaming_gpu.py b/sexp_effects/primitive_libs/streaming_gpu.py
index daab2d3..2b37593 100644
--- a/sexp_effects/primitive_libs/streaming_gpu.py
+++ b/sexp_effects/primitive_libs/streaming_gpu.py
@@ -960,6 +960,11 @@ def prim_fused_pipeline(img, effects_list, **dynamic_params):
         gpu_img = img
 
     # Run the fused pipeline
+    # Debug: log dynamic params occasionally
+    import random
+    if random.random() < 0.01:  # 1% of frames
+        print(f"[fused] dynamic_params: {dynamic_params}", file=sys.stderr)
+        print(f"[fused] effects: {[(e['op'], e.get('amount'), e.get('amplitude')) for e in effects_list]}", file=sys.stderr)
     return pipeline(gpu_img, **dynamic_params)