'GStreamer: getting the best quality to Twitch.tv

How can I optimize this pipeline to get the absolute best I can to show up on Twitch.tv, both for audio and video quality ?

gst-launch-1.0 \
    <MY_VIDEO_SOURCE> \
    ! videoconvert \
    ! video/x-raw, format=NV12 \
    ! x264enc bitrate=$BITRATE tune=zerolatency key-int-max=30 \
    ! queue \
    ! flvmux streamable=true name=flvmux \
    ! rtmpsink location="$STREAM_URL" \
    <MY_AUDIO_SOURCE> \
    ! faac \
    ! flvmux.


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