Fix #1721 by disabling \\?\ prefix for IM

beets/util/artresizer.py

@@ -92,8 +92,9 @@ def im_resize(maxwidth, path_in, path_out=None):
     # compatibility.
     try:
         util.command_output([
-            b'convert', util.syspath(path_in),
-            b'-resize', b'{0}x^>'.format(maxwidth), path_out
+            b'convert', util.syspath(path_in, prefix=False),
+            b'-resize', b'{0}x^>'.format(maxwidth),
+            util.syspath(path_out, prefix=False),
         ])
     except subprocess.CalledProcessError:
         log.warn(u'artresizer: IM convert failed for {0}',
@@ -119,7 +120,8 @@ def pil_getsize(path_in):
 
 
 def im_getsize(path_in):
-    cmd = [b'identify', b'-format', b'%w %h', util.syspath(path_in)]
+    cmd = [b'identify', b'-format', b'%w %h',
+           util.syspath(path_in, prefix=False)]
     try:
         out = util.command_output(cmd)
     except subprocess.CalledProcessError as exc:

docs/changelog.rst

@@ -69,6 +69,8 @@ Fixes:
 * :doc:`/plugins/convert`: Fix a crash with Unicode paths in ``--pretend``
   mode. :bug:`1735`
 * Fix a crash when sorting by nonexistent fields on queries. :bug:`1734`
+* Probably fix some mysterious errors when dealing with images using
+  ImageMagick on Windows. :bug:`1721`
 
 .. _Emby Server: http://emby.media