ffmpeg -i INPUT -f sox - | sox -t sox - -c 2 -b 16 -t wav - | neroaacenc --ignore-length -q 0.13 -if - -of you.aac
ffmpeg -i INPUT -f sox - | sox -t sox - -c 2 -b 16 -t wav - | venc -q-1.5 - you.ogg


INPUT < anything :D
-f sox - << set output to a sox-specific file
-t sox - << reads the special ffmpeg|sox pipe

-c 2     << downmix to 2 channels :D  :D :D
-b 16    << sets output to 16bit (needed for venc)

-t wav   << output wav for the audio encoders.

that's the pipe to use for sox