diff --git a/ffmpeg/_run.py b/ffmpeg/_run.py
index 10e203f..e5b22c6 100644
--- a/ffmpeg/_run.py
+++ b/ffmpeg/_run.py
@@ -159,8 +159,7 @@ def get_args(stream_spec, overwrite_output=False):
     filter_nodes = [node for node in sorted_nodes if isinstance(node, (FilterNode, SourceNode))]
     stream_name_map = {(node, None): str(i) for i, node in enumerate(input_nodes)}
     filter_arg = _get_filter_arg(filter_nodes, outgoing_edge_maps, stream_name_map)
-    if len(input_nodes) > 0:
-        args += reduce(operator.add, [_get_input_args(node) for node in input_nodes])
+    args += reduce(operator.add, [_get_input_args(node) for node in input_nodes])
     if filter_arg:
         args += ['-filter_complex', filter_arg]
     args += reduce(