diff --git a/anime_audio_filtered_helper.py b/anime_audio_filtered_helper.py
index c99846f..7ef05c3 100644
--- a/anime_audio_filtered_helper.py
+++ b/anime_audio_filtered_helper.py
@@ -216,7 +216,8 @@ final_clip.set_output()
         svtav1_param_list += [f"--{k}", str(v)]
     print(f"    - Using SvtAv1EncApp parameters: {' '.join(svtav1_param_list)}")
 
-    vspipe_cmd = ["vspipe", "--y4m", str(vpy_file), "-"]
+    # CORRECTED: Use '-c y4m' for modern vspipe versions instead of the legacy '--y4m' flag.
+    vspipe_cmd = ["vspipe", "-c", "y4m", str(vpy_file), "-"]
     svtav1_cmd = ["SvtAv1EncApp2"] + svtav1_param_list + ["-i", "-", "-b", str(encoded_video_file)]
 
     print(f"    - Running: {' '.join(vspipe_cmd)} | {' '.join(svtav1_cmd)}")