Support for MP4 container format
Name Category Description
cmus media-sound Ncurses based music player with plugin support for many formats
easytag media-sound GTK+ utility for editing MP2, MP3, MP4, FLAC, Ogg and other media tags
kid3 media-sound Simple tag editor based on Qt
mixxx media-sound Advanced Digital DJ tool based on Qt
mod_musicindex www-apache mod_musicindex allows nice displaying of directories containing music files
qtgain media-sound Simple frontend to mp3gain, vorbisgain and metaflac
x264-encoder media-video A free commandline encoder for X264/AVC streams

Thank you!