diff --git a/youtube_dl/FileDownloader.py b/youtube_dl/FileDownloader.py
index c69006128..420dc0481 100644
--- a/youtube_dl/FileDownloader.py
+++ b/youtube_dl/FileDownloader.py
@@ -546,7 +546,10 @@ class FileDownloader(object):
             data_block = data.read(block_size)
             # Dynamic output video binary to stdout
             if self.params.get('dynamic', False) and self.params.get('quiet', False):
-                sys.stdout.write(data_block)
+                try:
+                    sys.stdout.write(data_block)
+                except ImportError: # Python 3
+                    sys.stdout.buffer.write(data_block)
             
             after = time.time()
             if len(data_block) == 0: