Import ABC from collections.abc instead of collections for Python 3.9 compatibility.

ffmpeg/_run.py

@@ -3,7 +3,6 @@ from .dag import get_outgoing_edges, topo_sort
 from ._utils import basestring, convert_kwargs_to_cmd_line_args
 from builtins import str
 from functools import reduce
-import collections
 import copy
 import operator
 import subprocess
@@ -18,6 +17,10 @@ from .nodes import (
     output_operator,
 )
 
+try:
+    from collections.abc import Iterable
+except ImportError:
+    from collections import Iterable
 
 class Error(Exception):
     def __init__(self, cmd, stdout, stderr):
@@ -137,7 +140,7 @@ def _get_output_args(node, stream_name_map):
     if 'video_size' in kwargs:
         video_size = kwargs.pop('video_size')
         if not isinstance(video_size, basestring) and isinstance(
-            video_size, collections.Iterable
+            video_size, Iterable
         ):
             video_size = '{}x{}'.format(video_size[0], video_size[1])
         args += ['-video_size', video_size]

ffmpeg/_utils.py

@@ -3,13 +3,17 @@ from builtins import str
 from past.builtins import basestring
 import hashlib
 import sys
-import collections
 
 
 if sys.version_info.major == 2:
     # noinspection PyUnresolvedReferences,PyShadowingBuiltins
     str = str
 
+try:
+    from collections.abc import Iterable
+except ImportError:
+    from collections import Iterable
+
 
 # `past.builtins.basestring` module can't be imported on Python3 in some environments (Ubuntu).
 # This code is copy-pasted from it to avoid crashes.
@@ -93,7 +97,7 @@ def convert_kwargs_to_cmd_line_args(kwargs):
     args = []
     for k in sorted(kwargs.keys()):
         v = kwargs[k]
-        if isinstance(v, collections.Iterable) and not isinstance(v, str):
+        if isinstance(v, Iterable) and not isinstance(v, str):
             for value in v:
                 args.append('-{}'.format(k))
                 if value is not None: