diff --git a/audio/paddleaudio/csrc/pybind/sox/io.cpp b/audio/paddleaudio/csrc/pybind/sox/io.cpp
index 93a85cbe7f23d904ddb5fd7ba565ee145b91ef8d..31ac1c548864a2513022ec297ebb2d648cc6c8ab 100644
--- a/audio/paddleaudio/csrc/pybind/sox/io.cpp
+++ b/audio/paddleaudio/csrc/pybind/sox/io.cpp
@@ -25,7 +25,8 @@ auto get_info_file(const std::string &path, const std::string &format)
   SoxFormat sf(sox_open_read(path.data(),
                              /*signal=*/nullptr,
                              /*encoding=*/nullptr,
-                             /*filetype=*/format.data()));
+                             /*filetype=*/format.empty() ? nullptr : format.data()));
+  
 
   validate_input_file(sf, path);
 
@@ -54,7 +55,7 @@ auto get_info_fileobj(py::object fileobj, const std::string &format)
   SoxFormat sf(sox_open_mem_read(buf, buf_size,
                                  /*signal=*/nullptr,
                                  /*encoding=*/nullptr,
-                                 /*filetype=*/format.data()));
+                                 /*filetype=*/format.empty() ? nullptr : format.data()));
 
   // In case of streamed data, length can be 0
   validate_input_memfile(sf);
diff --git a/audio/setup.py b/audio/setup.py
index 0e78d9fc6ae0180c19c4ce477aa1547010c8f1a8..bf6c4d1632d17a5772d20e4b75d43bd5f9fe3146 100644
--- a/audio/setup.py
+++ b/audio/setup.py
@@ -19,7 +19,6 @@ import pybind11
 import setuptools
 from setuptools import Extension
 from setuptools.command.build_ext import build_ext
-from setuptools.command.install import install
 from setuptools.command.test import test
 
 # set the version here
@@ -47,11 +46,6 @@ class TestCommand(test):
             os.system(f'pytest {benchmark_item}')
 
 
-class InstallCommand(install):
-    def run(self):
-        install.run(self)
-
-
 class ExtBuildCommand(build_ext):
     def run(self):
         try:
@@ -149,7 +143,6 @@ setuptools.setup(
     },
     ext_modules=get_ext_modules(),
     cmdclass={
-        'install': InstallCommand,
         "build_ext": ExtBuildCommand,
         'test': TestCommand,
     }, )