diff --git a/pymkv/MKVFile.py b/pymkv/MKVFile.py
index ea581f0..afc234c 100644
--- a/pymkv/MKVFile.py
+++ b/pymkv/MKVFile.py
@@ -260,11 +260,11 @@ def mux(self, output_path, silent=False):
                                     'property')
         output_path = expanduser(output_path)
         if silent:
-            sp.run(self.command(output_path, subprocess=True), stdout=open(devnull, 'wb'))
+            sp.run(self.command(output_path, subprocess=True), stdout=open(devnull, 'wb'), check=True)
         else:
             command = self.command(output_path)
             print('Running with command:\n"' + command + '"')
-            sp.run(self.command(output_path, subprocess=True))
+            sp.run(self.command(output_path, subprocess=True), check=True, capture_output=True)
 
     def add_file(self, file):
         """Add an MKV file into the :class:`~pymkv.MKVFile` object.
diff --git a/pymkv/Verifications.py b/pymkv/Verifications.py
index 9a7fe27..ad74270 100644
--- a/pymkv/Verifications.py
+++ b/pymkv/Verifications.py
@@ -4,6 +4,7 @@
 """Verification functions for mkvmerge and associated files."""
 
 import json
+import os
 from os.path import expanduser, isfile
 from re import match
 import subprocess as sp
@@ -25,7 +26,7 @@ def verify_mkvmerge(mkvmerge_path='mkvmerge'):
 
 
 def verify_matroska(file_path, mkvmerge_path='mkvmerge'):
-    """Verify a file is a Matroska file.
+    """Verify if a file is a Matroska file.
 
     file_path (str):
         Path of the file to be verified.
@@ -35,7 +36,9 @@ def verify_matroska(file_path, mkvmerge_path='mkvmerge'):
     if not verify_mkvmerge(mkvmerge_path=mkvmerge_path):
         raise FileNotFoundError('mkvmerge is not at the specified path, add it there or change the mkvmerge_path '
                                 'property')
-    if not isinstance(file_path, str):
+    if isinstance(file_path, os.PathLike):
+        file_path = str(file_path)
+    elif not isinstance(file_path, str):
         raise TypeError('"{}" is not of type str'.format(file_path))
     file_path = expanduser(file_path)
     if not isfile(file_path):