From c2c6a864d2fea9948f04f973bb69f3a6368a9316 Mon Sep 17 00:00:00 2001
From: Davide Depau <davide@depau.eu>
Date: Thu, 21 Dec 2017 15:55:36 +0100
Subject: [PATCH] Make sure `item` is instance of `slice` in `__getitem__`

---
 ffmpeg/nodes.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ffmpeg/nodes.py b/ffmpeg/nodes.py
index 5c3067d..fea04a8 100644
--- a/ffmpeg/nodes.py
+++ b/ffmpeg/nodes.py
@@ -49,7 +49,7 @@ class Stream(object):
         Please note that this can only be used to select a substream that already exist. If you want to split
         the stream, use the `split` filter.
         """
-        if item.start != None:
+        if not isinstance(item, slice) or item.start is not None:
             raise ValueError("Invalid syntax. Use 'stream[:\"something\"]', not 'stream[\"something\"]'.")
 
         return self.node.stream(select=item.stop)