It seems that something has changed at the BBC's end.
I have been using
Replay AV to successfully rip BBC Radio 1 and 4 streams for over a year, and a month or so ago (perhaps a little more), it stopped working. It will still connect to the URL (as per the example from "Stream Recorder") and play it, but won't rip (download) it.
I've tried various other programs since (
BBC Radio Ripper,
HiDownload, etc.) and they all exhibit the same behaviour - they locate the rtsp stream with no problem and play it fine, but cannot rip (download it). I've also used
URL Snooper to double check the stream URL, and it comes back with the same ones as I am using.
The only possibility at the moment seems to be to capture the audio in real time, which is obviously what this type of software was designed to avoid.
The programs themselves are still working fine, as I have tested them all with other streams (Virgin Media and XFM in the UK) and they rip as expected - it's only the BBC ones which no longer work.
If anybody has any suggestions then I'd be interested, but for now it seems that ripping BBC rtsp streams isn't possible for me.