https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21567
--- a/libavcodec/libsvtav1.c
+++ b/libavcodec/libsvtav1.c
@@ -239,5 +239,9 @@
         param->qp                   = svt_enc->qp;
         param->rate_control_mode    = 0;
+#if SVT_AV1_CHECK_VERSION(4, 0, 0)
+        param->aq_mode = 0;
+#else
         param->enable_adaptive_quantization = 0;
+#endif
     }