diff --git a/av/container/core.pyx b/av/container/core.pyx
index 3da402f2f..2b9a1244b 100755
--- a/av/container/core.pyx
+++ b/av/container/core.pyx
@@ -95,7 +95,7 @@ cdef int pyav_io_open_gil(lib.AVFormatContext *s,
         pb[0] = pyio_file.iocontext
         return 0
 
-    except Exception as e:
+    except Exception:
         return stash_exception()
 
 
@@ -117,7 +117,7 @@ cdef int pyav_io_close_gil(lib.AVFormatContext *s, lib.AVIOContext *pb) noexcept
         else:
             result = pyio_close_gil(pb)
 
-    except Exception as e:
+    except Exception:
         stash_exception()
         result = lib.AVERROR_UNKNOWN  # Or another appropriate error code
 
diff --git a/av/container/pyio.pyx b/av/container/pyio.pyx
index 821ae9c0c..c8b82f96a 100644
--- a/av/container/pyio.pyx
+++ b/av/container/pyio.pyx
@@ -89,7 +89,7 @@ cdef int pyio_read_gil(void *opaque, uint8_t *buf, int buf_size) noexcept:
         if not res:
             return lib.AVERROR_EOF
         return len(res)
-    except Exception as e:
+    except Exception:
         return stash_exception()
 
 
@@ -108,7 +108,7 @@ cdef int pyio_write_gil(void *opaque, const uint8_t *buf, int buf_size) noexcept
         bytes_written = ret_value if isinstance(ret_value, int) else buf_size
         self.pos += bytes_written
         return bytes_written
-    except Exception as e:
+    except Exception:
         return stash_exception()
 
 
@@ -140,7 +140,7 @@ cdef int64_t pyio_seek_gil(void *opaque, int64_t offset, int whence):
             else:
                 res = self.ftell()
         return res
-    except Exception as e:
+    except Exception:
         return stash_exception()
 
 
@@ -148,7 +148,7 @@ cdef int pyio_close_gil(lib.AVIOContext *pb):
     try:
         return lib.avio_close(pb)
 
-    except Exception as e:
+    except Exception:
         stash_exception()
 
 
@@ -158,12 +158,12 @@ cdef int pyio_close_custom_gil(lib.AVIOContext *pb):
         self = <PyIOFile>pb.opaque
 
         # Flush bytes in the AVIOContext buffers to the custom I/O
-        result = lib.avio_flush(pb)
+        lib.avio_flush(pb)
 
         if self.fclose is not None:
             self.fclose()
 
         return 0
 
-    except Exception as e:
+    except Exception:
         stash_exception()
diff --git a/av/logging.pyx b/av/logging.pyx
index 66a5095ad..9cb232d2a 100644
--- a/av/logging.pyx
+++ b/av/logging.pyx
@@ -318,7 +318,7 @@ cdef void log_callback(void *ptr, int level, const char *format, lib.va_list arg
     with gil:
         try:
             log_callback_gil(level, name, message)
-        except Exception as e:
+        except Exception:
             fprintf(stderr, "av.logging: exception while handling %s[%d]: %s\n",
                     name, level, message)
             # For some reason lib.PyErr_PrintEx(0) won't work.
diff --git a/av/subtitles/subtitle.pyx b/av/subtitles/subtitle.pyx
index 373bb529b..a713daa22 100644
--- a/av/subtitles/subtitle.pyx
+++ b/av/subtitles/subtitle.pyx
@@ -16,7 +16,6 @@ cdef class SubtitleSet:
     """
     def __cinit__(self, SubtitleProxy proxy):
         self.proxy = proxy
-        cdef int i
         self.rects = tuple(build_subtitle(self, i) for i in range(self.proxy.struct.num_rects))
 
     def __repr__(self):
diff --git a/av/video/frame.pyx b/av/video/frame.pyx
index 4647ab81f..84a35cc49 100644
--- a/av/video/frame.pyx
+++ b/av/video/frame.pyx
@@ -55,7 +55,6 @@ cdef copy_bytes_to_plane(img_bytes, VideoPlane plane, unsigned int bytes_per_pix
     cdef const uint8_t[:] i_buf = img_bytes
     cdef size_t i_pos = 0
     cdef size_t i_stride = plane.width * bytes_per_pixel
-    cdef size_t i_size = plane.height * i_stride
 
     cdef uint8_t[:] o_buf = plane
     cdef size_t o_pos = 0
diff --git a/setup.py b/setup.py
index bef384515..f1ae841dd 100644
--- a/setup.py
+++ b/setup.py
@@ -188,15 +188,18 @@ def parse_cflags(raw_flags):
     library_dirs=extension_extra["library_dirs"],
 )
 
+compiler_directives = {
+    "c_string_type": "str",
+    "c_string_encoding": "ascii",
+    "embedsignature": True,
+    "binding": False,
+    "language_level": 3,
+}
+
 # Add the cythonized loudnorm extension to ext_modules
 ext_modules = cythonize(
     loudnorm_extension,
-    compiler_directives={
-        "c_string_type": "str",
-        "c_string_encoding": "ascii",
-        "embedsignature": True,
-        "language_level": 3,
-    },
+    compiler_directives=compiler_directives,
     build_dir="src",
     include_path=["include"],
 )
@@ -223,12 +226,7 @@ def parse_cflags(raw_flags):
                 library_dirs=extension_extra["library_dirs"],
                 sources=[pyx_path],
             ),
-            compiler_directives={
-                "c_string_type": "str",
-                "c_string_encoding": "ascii",
-                "embedsignature": True,
-                "language_level": 3,
-            },
+            compiler_directives=compiler_directives,
             build_dir="src",
             include_path=["include"],
         )