[Bug 741427] RFC: gst-launch/gst-inspect support for presets

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741427
  GStreamer | gstreamer (core) | 1.x

--- Comment #3 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2014-12-15 13:44:34 UTC ---
Tim, if we'd add a 'preset' property, every element would need to implement it.
And that just in order to support gst-launch. Apps would use the preset iface.
Secondly, there is some risk that an element already has a property called
'preset' :/

To my knowledge we just have the equalizer and freeverb supporting presets.
Right now I am proposing in #611689 to also implement the preset iface.

For freeverb I never submitted them (will do that right away). Lots of encoders
have the preset iface added, but no one added a preset file so far.

Please also note that my proposal of @preset was not meant to hack around the
lack of interfaces support in gst-launch, quite the contrary. If we want to
support e.g. the preset iface in gst-launch, we need a syntax for it, so that
the parser can match on it. Better ideas for the syntax are welcome. I proposed
@preset as some command-line tools use this notation for commandline parameter
files and I thought this metaphor matches quite nicely to what presets are for
element-properties.

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