@martin I just used https://github.com/linuxmatters/jivetalking to process a episode for the @hpr reserve queue.
It worked great for me but then I have a certain reputation when it comes to podcast audio.
I'd be very interested to know what @thaj thinks about it.
We have several terabytes of raw CC-BY-SA unprocessed audio of very varying quality and formats uploaded over the years, from more than 435 hosts. If you ever want to stress test it just say the word.