what mux. does in pipeline screen

[manas_mandal]

This pipeline encodes a test audio and video stream and muxes both into an
FLV file.
gst-launch-1.0 -v flvmux name=mux ! filesink location=test.flv  audiotestsrc
samplesperbuffer=44100 num-buffers=10 ! faac ! mux.  videotestsrc
num-buffers=250 ! video/x-raw,framerate=25/1 ! x264enc ! mux.

I am able to find any reference doc where it is explained what "mux." and
use of dot in pipeline command during muxing, i would like to know what it
actually does if anyone can explain or give me any doc for reference it will
be a great help



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