diff --git a/mmcv/utils/misc.py b/mmcv/utils/misc.py
index 7957ea89b7..1313c74197 100644
--- a/mmcv/utils/misc.py
+++ b/mmcv/utils/misc.py
@@ -8,6 +8,7 @@
 from importlib import import_module
 from inspect import getfullargspec
 from itertools import repeat
+import platform
 
 
 # From PyTorch internals
@@ -251,10 +252,16 @@ def _check_py_package(package):
 
 
 def _check_executable(cmd):
-    if subprocess.call(f'which {cmd}', shell=True) != 0:
-        return False
-    else:
-        return True
+    if platform.system() == 'Linux':
+        if subprocess.call(f'which {cmd}', shell=True) != 0:
+            return False
+        else:
+            return True
+    if platform.system() == 'Windows':
+        if subprocess.call(f'where {cmd}', shell=True) != 0:
+            return False
+        else:
+            return True
 
 
 def requires_package(prerequisites):
diff --git a/mmcv/video/processing.py b/mmcv/video/processing.py
index 90e2a4c022..88d0b0e34e 100644
--- a/mmcv/video/processing.py
+++ b/mmcv/video/processing.py
@@ -45,8 +45,8 @@ def convert_video(in_file: str,
             options.append(f'-loglevel {v}')
         else:
             options.append(f'-{k} {v}')
-    cmd = f'ffmpeg -y {pre_options} -i {in_file} {" ".join(options)} ' \
-          f'{out_file}'
+    cmd = f'ffmpeg -y {pre_options} -i "{in_file}" {" ".join(options)} ' \
+          f'"{out_file}"'
     if print_cmd:
         print(cmd)
     subprocess.call(cmd, shell=True)