Available environment vars

[Arnaud Loonstra]

Hi all,

Might be a noob question but how do I find the available environment 
variables to control the behaviour of gstreamer.

For example I'm trying out an openGL ES setup but on my desktop it by 
default opens a regular GL context. There's probably some variable 
somewhere to set the GL api?

like: GST_GL_API=gles2 gst-launch-1.0 videotestsrc ! glimagesink

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