[Bug 777915] rate negotiation sometimes fails

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777915

--- Comment #7 from John Sauter <John_Sauter at systemeyescomputerstore.com> ---
I can confirm that the problem goes away with a capsfilter after the mixer. 
There is a similar problem with format:

gst-launch-1.0 \
    fakesrc num-buffers=5 format=GST_FORMAT_TIME ! \
    audio/x-raw,rate=48000,format=F32LE,channels=1,layout=interleaved ! \
    audioconvert ! audioresample ! \
    adder name=mix ! \
    fakesink \
    fakesrc num-buffers=5 format=GST_FORMAT_TIME ! \
    audio/x-raw,rate=48000,format=S16LE,channels=1,layout=interleaved ! \
    audioconvert ! audioresample  ! mix. 

This problem is also avoided by placing a capsfilter after the mixer.
I assume your proposed fix to the mixers would also fix this problem.

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