From version 0.3.2-1 and until the present version 0.3.3-1, gst123 har not worked for me. There is simply no sound when I play e.g. an mp3-file. Also there is no error output from gst123. I am using the Debian packages. I have tested and verified that the underlying gstreamer framework functions by running the test schemes outlined at
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/faq/html/chapter-using.html - and everything works and I can play the test sound. I am using alsa as audio-output, but just for the sake of testing I have tried some of the other drivers, but it is all mute. Gst123 used to work for me prior to version 0.3.2 and I am sort of stuck in trying to find out why there is no sound. I am attaching a strace output. I hope that someone can help me getting sound back.