diff --git a/ffmpeg/_ffmpeg.py b/ffmpeg/_ffmpeg.py
index 1e7690e..7ea3be2 100644
--- a/ffmpeg/_ffmpeg.py
+++ b/ffmpeg/_ffmpeg.py
@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+from past.builtins import basestring
 from ._utils import basestring
 
 from .nodes import (
@@ -26,13 +27,20 @@ def input(filename, **kwargs):
     return InputNode(input.__name__, kwargs=kwargs).stream()
 
 
+@output_operator()
+def global_args(stream, *args):
+    """Add extra global command-line argument(s), e.g. ``-progress``.
+    """
+    return GlobalNode(stream, global_args.__name__, args).stream()
+
+
 @output_operator()
 def overwrite_output(stream):
     """Overwrite output files without asking (ffmpeg ``-y`` option)
 
     Official documentation: `Main options <https://ffmpeg.org/ffmpeg.html#Main-options>`__
     """
-    return GlobalNode(stream, overwrite_output.__name__).stream()
+    return GlobalNode(stream, overwrite_output.__name__, ['-y']).stream()
 
 
 @output_operator()
diff --git a/ffmpeg/_run.py b/ffmpeg/_run.py
index 804264d..cec8bfb 100644
--- a/ffmpeg/_run.py
+++ b/ffmpeg/_run.py
@@ -1,5 +1,7 @@
 from __future__ import unicode_literals
 
+from builtins import str
+from past.builtins import basestring
 from .dag import get_outgoing_edges, topo_sort
 from functools import reduce
 from ._utils import basestring
@@ -10,7 +12,6 @@ import subprocess as _subprocess
 from ._ffmpeg import (
     input,
     output,
-    overwrite_output,
 )
 from .nodes import (
     get_stream_spec_nodes,
@@ -92,10 +93,7 @@ def _get_filter_arg(filter_nodes, outgoing_edge_maps, stream_name_map):
 
 
 def _get_global_args(node):
-    if node.name == overwrite_output.__name__:
-        return ['-y']
-    else:
-        raise ValueError('Unsupported global node: {}'.format(node))
+    return list(node.args)
 
 
 def _get_output_args(node, stream_name_map):
diff --git a/ffmpeg/_utils.py b/ffmpeg/_utils.py
index 20eb1af..3514409 100644
--- a/ffmpeg/_utils.py
+++ b/ffmpeg/_utils.py
@@ -1,10 +1,12 @@
 from __future__ import unicode_literals
+from builtins import str
+from past.builtins import basestring
 import hashlib
 import sys
 
 if sys.version_info.major == 2:
     # noinspection PyUnresolvedReferences,PyShadowingBuiltins
-    str = unicode
+    str = str
 
 
 # `past.builtins.basestring` module can't be imported on Python3 in some environments (Ubuntu).
diff --git a/ffmpeg/dag.py b/ffmpeg/dag.py
index 335a060..fb51c6a 100644
--- a/ffmpeg/dag.py
+++ b/ffmpeg/dag.py
@@ -75,7 +75,7 @@ DagEdge = namedtuple('DagEdge', ['downstream_node', 'downstream_label', 'upstrea
 
 def get_incoming_edges(downstream_node, incoming_edge_map):
     edges = []
-    for downstream_label, upstream_info in incoming_edge_map.items():
+    for downstream_label, upstream_info in list(incoming_edge_map.items()):
         upstream_node, upstream_label, upstream_selector = upstream_info
         edges += [DagEdge(downstream_node, downstream_label, upstream_node, upstream_label, upstream_selector)]
     return edges
@@ -97,7 +97,7 @@ class KwargReprNode(DagNode):
     @property
     def __upstream_hashes(self):
         hashes = []
-        for downstream_label, upstream_info in self.incoming_edge_map.items():
+        for downstream_label, upstream_info in list(self.incoming_edge_map.items()):
             upstream_node, upstream_label, upstream_selector = upstream_info
             hashes += [hash(x) for x in [downstream_label, upstream_node, upstream_label, upstream_selector]]
         return hashes
diff --git a/ffmpeg/nodes.py b/ffmpeg/nodes.py
index e861822..46b7897 100644
--- a/ffmpeg/nodes.py
+++ b/ffmpeg/nodes.py
@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+from past.builtins import basestring
 from .dag import KwargReprNode
 from ._utils import escape_chars, get_hash_int
 from builtins import object
diff --git a/ffmpeg/tests/test_ffmpeg.py b/ffmpeg/tests/test_ffmpeg.py
index 1f43158..c7805fa 100644
--- a/ffmpeg/tests/test_ffmpeg.py
+++ b/ffmpeg/tests/test_ffmpeg.py
@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+from builtins import str
 from builtins import bytes
 from builtins import range
 import ffmpeg
@@ -105,6 +106,11 @@ def test_get_args_simple():
     assert out_file.get_args() == ['-i', 'dummy.mp4', 'dummy2.mp4']
 
 
+def test_global_args():
+    out_file = ffmpeg.input('dummy.mp4').output('dummy2.mp4').global_args('-progress', 'someurl')
+    assert out_file.get_args() == ['-i', 'dummy.mp4', 'dummy2.mp4', '-progress', 'someurl']
+
+
 def _get_complex_filter_example():
     split = (ffmpeg
         .input(TEST_INPUT_FILE1)