Apparenty in this case the issue is that I used capsfilter to force audioconvert to emit audio/x-raw-int (channels=1), but rglimiter expects audio/x-raw-float. The fix is to also allow emitting audio/x-raw-float (channels=1).
Apparenty in this case the issue is that I used capsfilter to force audioconvert to emit audio/x-raw-int (channels=1), but rglimiter expects audio/x-raw-float. The fix is to also allow emitting audio/x-raw-float (channels=1).