diff --git a/ffmpeg/nodes.py b/ffmpeg/nodes.py
index e8b2838..cf9a35a 100644
--- a/ffmpeg/nodes.py
+++ b/ffmpeg/nodes.py
@@ -289,7 +289,13 @@ class FilterNode(Node):
         out_kwargs = {}
         for k, v in list(kwargs.items()):
             k = escape_chars(k, '\\\'=:')
-            v = escape_chars(v, '\\\'=:')
+            if isinstance(v, dict):
+                v = ','.join(['{}={}'.format(
+                    escape_chars(vk, '\\\'=:'),
+                    escape_chars(v[vk], '\\\'=:')
+                ) for vk in sorted(v)])
+            else:
+                v = escape_chars(v, '\\\'=:')
             out_kwargs[k] = v
 
         arg_params = [escape_chars(v, '\\\'=:') for v in out_args]
diff --git a/ffmpeg/tests/test_ffmpeg.py b/ffmpeg/tests/test_ffmpeg.py
index 8dbc271..8c28bc9 100644
--- a/ffmpeg/tests/test_ffmpeg.py
+++ b/ffmpeg/tests/test_ffmpeg.py
@@ -131,6 +131,19 @@ def test_repeated_args():
         'dummy2.mp4',
     ]
 
+def test_filter_sub_options():
+    subtitle_filter = ffmpeg.input('dummy.mp4').filter('subtitles', force_style={
+        'Alignement': '6', 'Fontsize': '48'}).output('dummy2.mp4')
+    assert subtitle_filter.get_args() == [
+        '-i',
+        'dummy.mp4',
+        '-filter_complex',
+        r'[0]subtitles=force_style=Alignement=6\,Fontsize=48[s0]',
+        '-map',
+        '[s0]',
+        'dummy2.mp4'
+    ]
+
 
 def test__get_args__simple():
     out_file = ffmpeg.input('dummy.mp4').output('dummy2.mp4')