[downloader/f4m] Simply select format when it's the only one

diff --git a/youtube_dl/downloader/f4m.py b/youtube_dl/downloader/f4m.py
index 314def4cb031abe1ff2d198856c4022885a242f8..8f88b02414a28a8da650e03418c8ecd7e52a59a6 100644 (file)
--- a/youtube_dl/downloader/f4m.py
+++ b/youtube_dl/downloader/f4m.py
@@ -319,7 +319,7 @@ class F4mFD(FragmentFD):
         doc = compat_etree_fromstring(manifest)
         formats = [(int(f.attrib.get('bitrate', -1)), f)
                    for f in self._get_unencrypted_media(doc)]
-        if requested_bitrate is None:
+        if requested_bitrate is None or len(formats) == 1:
             # get the best format
             formats = sorted(formats, key=lambda f: f[0])
             rate, media = formats[-1]