gst-launch-ext is a tool that is used to run a basic predefined GStreamer pipeline. This application is only used as a quick test to ensure proper working of codecs and GStreamer. It doesn't handle more advanced features like synchronisation.
All supported formats in GStreamer should be playable by simply typing:
It will also print out the pipeline it uses, so you can customize it using cut and paste.
gst-launch-ext can be configured by creating a .gst file in your home directory. This is a perl-style configuration file and can override the defaults for audio and video output sinks.
Here is an example .gst file that implements the same defaults as hard-coded in the script :
AUDIOSINK = "osssink"; VIDEOSINK = "colorspace ! xvideosink";
You can change osssink to any of esdsink, alsasink, jacksink (if you have the plug-in), and you can change xvideosink to aasink or sdlvideosink.
Other plug-ins might be used as well if GStreamer has them.