That would be good, but I would rather it did not use a lossy format as its output though, but rather raw (lossless) data written to stdout so that you can then

That would be good, but I would rather it did not use a lossy format as its output though, but rather raw (lossless) data written to stdout so that you can then use a separate encoder for whatever format you want (whether lossless or lossy, including MP3 if wanted, but Opus is better).