h.264 produces a ca 25% smaller format than the "older" setting. Interestingly, none of the 3 Sharx settings enable the audio selection in the video tab. Could this be the issue?
The "inspect now" function suggested these drivers: Checking for common cameras, none of which works
Foscam FI86xx/98xx compatible?
Foscam FI89xx compatible?
Foscam FI9821 V2 compatible?
Foscam FI9821 media port compatible?
...and, the inspect now actually changed the setting to this, which enabled the Audio path but failed to connect to the camera, issuing a "No signal" "I/O error:0"