CVLC: RTSP in -> transcode & rotate -> RTSP out

[albenex]

Hi All,
I'm using my raspberry pi3 in order to collect some LAN RTSP streams, transcode them, apply some credential and stream out.
here my working command line string:

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cvlc rtsp://admin:*****@192.168.199.114:554/av0 --sout '#rtp{sdp=rtsp://192.168.199.12:55405/cam5.sdp}' --sout-avcodec-strict -2 --sout-rtsp-user **** --sout-rtsp-pwd ****

For one of these streams i need also to apply a 180° rotation.

now i want to add rotation.
as per https://wiki.videolan.org/transcode/#Rotation_example i should add something like

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--transform-type=180

and

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--sout=#transcode{vcodec="h264",vb="1500",acodec="mp4a",ab="96","channels=2",samplerate="44100",vfilter="transform"}

however not sure on how to proceed as trying to chain either #transcode and #rtp modules i get an error

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main stream output error: stream chain failed for `transcode{vfilter='rotate'}:#rtp{sdp

can you help on this?

thank you in advance