[Bug 752762] crossfade: New example for crossfading audio tracks using audiomixer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752762

--- Comment #2 from Nirbheek Chauhan <nirbheek.chauhan at gmail.com> ---
Most of the complexity is in the EOS handling. It is quite easy to handle
on-demand cross-fade; you setup the control sources and let it handle the
properties for you, and remove the pad when the cross-fade is done. It is
difficult to cross-fade on (near) EOS automatically in a bin because the
implementation involves guesswork and a certain amount of queuing.

I'm sure it can be done, but someone has to do the work.

I'm not sure why this never made it into the examples though; I've forgotten
the reason.

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