Implement libsyn channel extractor on youtube-
You know https://rg3.github.io/youtube-dl/.
They use the URL
https://html5-player.libsyn.com/embed/episode/id/<episode_id> for the episodes. For a list of episodes you can just use
https://html5-player.libsyn.com/embed/list/id/<channel_id> (plus pagination parameters and whatever else).
If you need an example, here goes one with the embedded player ready to be extracted: http://www.thehistoryofancientg
You must submit your change and hopefully get it merged.