- # extract only the formats that we know that they will be available as http format.
- # https://projects.pbs.org/confluence/display/coveapi/COVE+Video+Specifications
+ # Lower qualities (150k and 192k) are not available as HTTP formats (see [1]),
+ # we won't try extracting them.
+ # Since summer 2016 higher quality formats (4500k and 6500k) are also available
+ # albeit they are not documented in [2].
+ # 1. https://github.com/rg3/youtube-dl/commit/cbc032c8b70a038a69259378c92b4ba97b42d491#commitcomment-17313656
+ # 2. https://projects.pbs.org/confluence/display/coveapi/COVE+Video+Specifications