diff --git a/ivas_processing_scripts/processing/chains.py b/ivas_processing_scripts/processing/chains.py
index 9c52bdc8af1c93af291c71cf0871fa31cea3f857..1a48834d6c1c421767457f3f6c5407152532341c 100755
--- a/ivas_processing_scripts/processing/chains.py
+++ b/ivas_processing_scripts/processing/chains.py
@@ -243,6 +243,11 @@ def get_prerend(
         attrs.setdefault("bin", get_abs_path(rend_cfg.get("bin")))
         attrs.setdefault("opts", rend_cfg.get("opts"))
         attrs.setdefault("use_windows_codec_binaries", use_windows_codec_binaries)
+        if attrs.get("in_fs") != attrs.get("out_fs"):
+            raise NotImplementedError(
+                f"IVAS rend does not support resampling. Prerendering specified with resampling from {attrs.get('in_fs')} to {attrs.get('out_fs')}."
+                f"\nPlease update your configuration or disable IVAS rend prerendering."
+            )
         return IVAS_rend(
             attrs,
         )
@@ -366,8 +371,11 @@ def get_processing_chain(
         if hasattr(cfg, "preprocessing_2"):
             preamble = cfg.preprocessing_2.get("preamble", 0)
 
-        # if the encoding format differs from the format after the preprocessing, add format conversion stuff
-        if (cod_fmt := cod_cfg.get("fmt", tmp_in_fmt)) != tmp_in_fmt:
+        # if the encoding format or fs differs from the values after preprocessing, add format conversion
+        cod_fmt = cod_cfg.get("fmt", tmp_in_fmt)
+        cod_fs = cod_cfg.get("fs", tmp_in_fs)
+        needs_preproc = (tmp_in_fmt != cod_fmt) or (tmp_in_fs != cod_fs)
+        if needs_preproc:
             chain["processes"].append(
                 get_prerend(
                     cod_cfg.get("ivas_prerend"),
@@ -376,7 +384,7 @@ def get_processing_chain(
                     attrs={
                         "in_fs": tmp_in_fs,
                         "in_fmt": tmp_in_fmt,
-                        "out_fs": tmp_in_fs,
+                        "out_fs": cod_fs,
                         "out_fmt": cod_fmt,
                         "multiprocessing": cfg.multiprocessing,
                         "tx_condition": False,
@@ -384,6 +392,7 @@ def get_processing_chain(
                 )
             )
             tmp_in_fmt = cod_fmt
+            tmp_in_fs = cod_fs
 
         chain["processes"].append(
             EVS(
@@ -445,8 +454,11 @@ def get_processing_chain(
         if hasattr(cfg, "preprocessing_2"):
             preamble = cfg.preprocessing_2.get("preamble", 0)
 
-        # if the encoding format differs from the format after the preprocessing, add format conversion
-        if (cod_fmt := cod_cfg.get("fmt", tmp_in_fmt)) != tmp_in_fmt:
+        # if the encoding format or fs differs from the values after preprocessing, add format conversion
+        cod_fmt = cod_cfg.get("fmt", tmp_in_fmt)
+        cod_fs = cod_cfg.get("fs", tmp_in_fs)
+        needs_preproc = (tmp_in_fmt != cod_fmt) or (tmp_in_fs != cod_fs)
+        if needs_preproc:
             chain["processes"].append(
                 get_prerend(
                     cod_cfg.get("ivas_prerend"),
@@ -455,7 +467,7 @@ def get_processing_chain(
                     attrs={
                         "in_fs": tmp_in_fs,
                         "in_fmt": tmp_in_fmt,
-                        "out_fs": tmp_in_fs,
+                        "out_fs": cod_fs,
                         "out_fmt": cod_fmt,
                         "multiprocessing": cfg.multiprocessing,
                         "tx_condition": False,
@@ -463,6 +475,7 @@ def get_processing_chain(
                 )
             )
             tmp_in_fmt = cod_fmt
+            tmp_in_fs = cod_fs
 
         # allow list of output values for IVAS
         tmp_out_fmt = dec_cfg.get("fmt", tmp_out_fmt)
diff --git a/ivas_processing_scripts/processing/ivas.py b/ivas_processing_scripts/processing/ivas.py
index c2e728e6e2379c05d7b0e29827578602adf9375e..01f8220f2b721c35c2cd3071397633b9e95cad9e 100755
--- a/ivas_processing_scripts/processing/ivas.py
+++ b/ivas_processing_scripts/processing/ivas.py
@@ -485,7 +485,7 @@ class IVAS_rend(Processing):
         self.in_fmt = audio.fromtype(self.in_fmt)
         self.out_fmt = audio.fromtype(self.out_fmt)
         if not hasattr(self, "opts"):
-            self.dec_opts = None
+            self.opts = None
         self._use_wine = (
             platform.system() == "Linux" and self.use_windows_codec_binaries
         )