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
flacon media-sound Extracts audio tracks from an audio CD image to separate tracks
h264enc media-video Script to encode H.264/AVC/MPEG-4 Part 10 formats
kid3 media-sound Simple tag editor based on Qt
libextractor media-libs Library to extract metadata from files of arbitrary type
mixxx media-sound Advanced Digital DJ tool based on Qt
mod_musicindex www-apache mod_musicindex allows nice displaying of directories containing music files
ogmrip media-video Graphical frontend and libraries for ripping DVDs and encoding to AVI/OGM/MKV/MP4
qtgain media-sound Simple frontend to mp3gain, vorbisgain and metaflac
split2flac media-sound sh script to split an APE/FLAC/WV/WAV audio image with CUE sheet into tracks
taglib media-libs Library for reading and editing audio meta data
x264-encoder media-video A free commandline encoder for X264/AVC streams
xmms2 media-sound X(cross)platform Music Multiplexing System. Next generation of the XMMS player

Thank you!