Jim Lesurf wrote:

My assumption is that is so. However I'm hoping I could capture the
*decoded* audio LPCM on its way to the 'DAC' by using ALSA. (cf
below) That would do for my purposes as I want "the results you get
using the BBC recommended setup" to find out what users can expect to
get.

I've only ever capped stereo browser/flash once, some time ago. The path
of least resistance for me was to use jack + the alsa-jack plugin as
flash would only output to alsa. IIRC it was just a case of running
qjackctl then using patchbay to connect the sound to arecord. IIRC
arecord was a better choice than ffmpeg as the latter started
overwriting when the wav size limit was reached, but arecord spawned a
new file and continued.