How to add container to Vorbis raw audio track

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Avidemux can extract Vorbis audio track. But the track is not playable:
http://www.avidemux.org/admWiki/doku.php?id=tutorial:save_only_audio

Is there a way how to put that stream in some audio container?

Or can Avidemux delete only video stream in some video file?

P.S.
I have managed it with avidemux by saving that webm video with mkv muxer and opened it in
http://www.videohelp.com/tools/MKVtoolnix and deleted video stream there and muxed as .mka
Could do that Avidemux?