Don't accept '-1' as format, 'all' is clearer

diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index bce7587fd89e59dffdecbc852bc70d9e14db4f14..be5b3c1ab5ff1980ed0db34c599e2a96417b9294 100755 (executable)
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1086,8 +1086,7 @@ class YoutubeDL(object):
         if req_format is None:
             req_format = 'best'
         formats_to_download = []
-        # The -1 is for supporting YoutubeIE
-        if req_format in ('-1', 'all'):
+        if req_format == 'all':
             formats_to_download = formats
         else:
             for rfstr in req_format.split(','):