Add temporary _sort_formats helper function

youtube_dl/YoutubeDL.py

@@ -676,17 +676,8 @@ class YoutubeDL(object):
             formats = list(takewhile_inclusive(
                 lambda f: f['format_id'] != format_limit, formats
             ))
-        if self.params.get('prefer_free_formats'):
+
-            def _free_formats_key(f):
+        # TODO Central sorting goes here
-                try:
-                    ext_ord = [u'flv', u'mp4', u'webm'].index(f['ext'])
-                except ValueError:
-                    ext_ord = -1
-                # We only compare the extension if they have the same height and width
-                return (f.get('height') if f.get('height') is not None else -1,
-                        f.get('width') if f.get('width') is not None else -1,
-                        ext_ord)
-            formats = sorted(formats, key=_free_formats_key)
 
         if formats[0] is not info_dict: 
             # only set the 'formats' fields if the original info_dict list them

youtube_dl/extractor/common.py

@@ -436,6 +436,47 @@ class InfoExtractor(object):
         }
         return RATING_TABLE.get(rating.lower(), None)
 
+    def _sort_formats(self, formats):
+        def _formats_key(f):
+            preference = f.get('preference')
+            if preference is None:
+                preference = 0 if f.get('url', '').startswith('http') else -0.1
+                if f.get('ext') in ['f4f', 'f4m']:  # Not yet supported
+                    preference -= 0.5
+
+            if f.get('vcodec') == 'none':  # audio only
+                if self._downloader.params.get('prefer_free_formats'):
+                    ORDER = [u'aac', u'mp3', u'm4a', u'webm', u'ogg', u'opus']
+                else:
+                    ORDER = [u'webm', u'opus', u'ogg', u'mp3', u'aac', u'm4a']
+                ext_preference = 0
+                try:
+                    audio_ext_preference = ORDER.index(f['ext'])
+                except ValueError:
+                    audio_ext_preference = -1
+            else:
+                if self._downloader.params.get('prefer_free_formats'):
+                    ORDER = [u'flv', u'mp4', u'webm']
+                else:
+                    ORDER = [u'webm', u'flv', u'mp4']
+                try:
+                    ext_preference = ORDER.index(f['ext'])
+                except ValueError:
+                    ext_preference = -1
+                audio_ext_preference = 0
+
+            return (
+                preference,
+                f.get('height') if f.get('height') is not None else -1,
+                f.get('width') if f.get('width') is not None else -1,
+                ext_preference,
+                f.get('vbr') if f.get('vbr') is not None else -1,
+                f.get('abr') if f.get('abr') is not None else -1,
+                audio_ext_preference,
+                f.get('filesize') if f.get('filesize') is not None else -1,
+                f.get('format_id'),
+            )
+        formats.sort(key=_formats_key)
 
 
 class SearchInfoExtractor(InfoExtractor):

youtube_dl/extractor/youtube.py

@@ -1433,16 +1433,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                 'format_note': note,
             })
 
-        def _formats_key(f):
+        self._sort_formats(formats)
-            note = f.get('format_note')
-            if note is None:
-                note = u''
-            is_dash = u'DASH' in note
-            return (
-                0 if is_dash else 1,
-                f.get('height') if f.get('height') is not None else -1,
-                f.get('width') if f.get('width') is not None else -1)
-        formats.sort(key=_formats_key)
 
         return {
             'id':           video_id,