libmtag is a C music tagging library with simple API. It uses taglib
behind the curtains, and as taglib, it supports ID3v1 and ID3v2 for MP3
files, Ogg Vorbis, and FLAC files. Bindings are available for Ruby and
gst-player is a very basic media player that uses
GStreamer. The objective is to be simple but
useful. Some of the features are based on
MPlayer's UI. gst-player can also be used as an
example for bigger projects.
gst-av is a GStreamer plug-in that provides support for libav (a fork of FFmpeg). It is similar to gst-ffmpeg, but all libav codecs are supported, even if there are native GStreamer alternatives, including VP8, MP3, Ogg/Vorbis, and AAC.