Perian Вам в помощь по поводу видео :
Perian aims to provide a single package for all your playback needs. It is a collection of QuickTime components incorporating several libraries:
• libavcodec, from the ffmpeg project, along with code from the old FFusion component:
• MS-MPEG4 v1 & v2
• DivX
• 3ivx
• H.264
• Flash Video
• Flash Screen Video
• VP6
• H263I
• VP3
• HuffYUV and ffvhuff
• Indeo 1 & 2
• MPEG-1 & 2 Video (in supported formats)
• Fraps (up to v4)
• Windows Media Audio v1 & v2
• Flash ADPCM
• Xiph Vorbis (in Matroska)
• MPEG Layer I and II audio
• DTS Coherent Acoustics audio
• Snow wavelet video
• DosBox video
• Nellymoser ASAO audio
• libavformat, from the ffmpeg project. along with AVIImporter.component:
• AVI file format
• FLV file format
• NUV file format
• libmatroska, along with matroska-qt.component:
• MKV file format
• Subtitles:
• (Advanced) SubStation Alpha
• SRT
• SAMI
• VobSub
• liba52, via A52Codec:
• AC3 audio
The code is available under the LGPL. The development site is located at <http://trac.perian.org/> and the project's Subversion repository is located at <http://svn.perian.org/>.
The code for A52Codec is available under the GPL. The project site is located at <http://trac.cod3r.com/a52codec/> and the project Subversion repository is located at <http://svn.cod3r.com/a52codec/>.
Или для перекодировки из формата в формат разного видео поищите софтинку под названием Episode - она все умеет и народные версии тоже есть
LAME 3.98.2 Audio encoder for mp3 files лежит вот здесь
http://www.macupdate.com/info.php/id/18882 или здесь
http://sourceforge.net/projects/lame/files/lame/3.98.2/lame-398-2.tar.gz/download - но требует сборки руками и наличия Xcode, установленного в системе
после установки все работает
