-                               (like "22 - 1280x720" or "HD")%(upload_date)s for
-                               the upload date (YYYYMMDD), %(extractor)s for the
-                               provider (youtube, metacafe, etc), %(id)s for the
-                               video id , %(playlist)s for the playlist the
-                               video is in, %(playlist_index)s for the position
-                               in the playlist and %% for a literal percent. Use
-                               - to output to stdout. Can also be used to
-                               download to a different directory, for example
-                               with -o '/my/downloads/%(uploader)s/%(title)s-%(i
-                               d)s.%(ext)s' .
+                               (like "22 - 1280x720" or "HD"),%(format_id)s for
+                               the unique id of the format (like Youtube's
+                               itags: "137"),%(upload_date)s for the upload date
+                               (YYYYMMDD), %(extractor)s for the provider
+                               (youtube, metacafe, etc), %(id)s for the video id
+                               , %(playlist)s for the playlist the video is in,
+                               %(playlist_index)s for the position in the
+                               playlist and %% for a literal percent. Use - to
+                               output to stdout. Can also be used to download to
+                               a different directory, for example with -o '/my/d
+                               ownloads/%(uploader)s/%(title)s-%(id)s.%(ext)s' .