RFC: gst-launch/gst-inspect support for presets

Submitted by Stefan Kost @ensonic

Link to original bug (#741427)

Description

Hi,

gst-inspect could list the preset names if an element implements the preset iface.

gst-launch could support a 'special' property called "@preset" to load a preset. e.g.
gst-launch uridecodebin uri="..." ! equalizer @preset="disco" ! ...

The rational for "@preset" is that it would not clash with other properties. Better ideas are welcome. if it sounds like a plan, I have a xmas vacation project :)

Version: 1.x