media_types/video/util.py: Add accepted resolutions

Add dict consisting of all the accepted resolutions with
their dimensions. This should be eventually moved to config
where the instance owner can modify it.

mediagoblin/media_types/video/util.py

@@ -18,6 +18,15 @@ import logging
 
 from mediagoblin import mg_globals as mgg
 
+ACCEPTED_RESOLUTIONS = {
+    '144p' : (256, 144),
+    '240p' : (352, 240),
+    '360p' : (480, 360),
+    '480p' : (858, 480),
+    '720p' : (1280, 720),
+    '1080p' : (1920, 1080),
+}
+
 _log = logging.getLogger(__name__)