gst-launch-1.0 audiotestsrc ! audioconvert ! audioresample ! alsasink
gst-launch-1.0 filesrc location=Peter_Gunn_Theme.mp3 ! decodebin ! audioconvert ! alsasink
gst-launch-1.0 filesrc location=Peter_Gunn_Theme.mp3 ! mad ! audioconvert ! alsasink

Force S16LE

gst-launch-1.0 filesrc location=Peter_Gunn_Theme.mp3 ! decodebin ! audioconvert ! audio/x-raw,format=S16LE ! alsasink

Find default alsa sink capabilities

gst-launch -v alsasrc ! alsasink
Pad:sink: caps = "audio/x-raw\,\ format\=\(string\)S16LE\,\ layout\=\(string\)interleaved\,\ rate\=\(int\)44100\

gst-launch -v alsasrc ! audio/x-raw-int, format=S16LE, layout=interleaved, rate=44100, channels=2 ! alsasink

gst-launch-1.0 videotestsrc ! fbdevsink
gst-launch-1.0 filesrc location=WiegelesHeliSki_800x450.avi ! decodebin ! videoconvert ! fbdevsink

gst-launch-1.0 filesrc location=WiegelesHeliSki_800x450.avi ! decodebin name=decoder \
decoder. ! videoconvert ! fbdevsink \
decoder. ! audioconvert ! alsasink

https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gst-running.html

export GST_DEBUG=3
# 3- fixme
# 4- info
# 5- debug
# 6- log
# 7- trace

GST_DEBUG=*:WARNING,*audio*:LOG