[YoutubeDL] Allow downloading multiple formats with ,

youtube_dl/YoutubeDL.py

@@ -809,9 +809,10 @@ class YoutubeDL(object):
         if req_format in ('-1', 'all'):
             formats_to_download = formats
         else:
+            for rfstr in req_format.split(','):
                 # We can accept formats requested in the format: 34/5/best, we pick
                 # the first that is available, starting from left
-            req_formats = req_format.split('/')
+                req_formats = rfstr.split('/')
                 for rf in req_formats:
                     if re.match(r'.+?\+.+?', rf) is not None:
                         # Two formats have been requested like '137+139'
@@ -829,7 +830,7 @@ class YoutubeDL(object):
                     else:
                         selected_format = self.select_format(rf, formats)
                     if selected_format is not None:
-                    formats_to_download = [selected_format]
+                        formats_to_download.append(selected_format)
                         break
         if not formats_to_download:
             raise ExtractorError('requested format not available',

youtube_dl/options.py

@@ -218,7 +218,7 @@ def parseOpts(overrideArguments=None):
 
     video_format.add_option('-f', '--format',
             action='store', dest='format', metavar='FORMAT', default=None,
-            help='video format code, specify the order of preference using slashes: -f 22/17/18 .  -f mp4 , -f m4a and  -f flv  are also supported. You can also use the special names "best", "bestvideo", "bestaudio", "worst", "worstvideo" and "worstaudio". By default, youtube-dl will pick the best quality.')
+            help='video format code, specify the order of preference using slashes: -f 22/17/18 .  -f mp4 , -f m4a and  -f flv  are also supported. You can also use the special names "best", "bestvideo", "bestaudio", "worst", "worstvideo" and "worstaudio". By default, youtube-dl will pick the best quality. Use commas to download multiple audio formats, such as  -f  136/137/mp4/bestvideo,140/m4a/bestaudio')
     video_format.add_option('--all-formats',
             action='store_const', dest='format', help='download all available video formats', const='all')
     video_format.add_option('--prefer-free-formats',