reference from original FFmpeg group website : http://www.ffmpeg.org/download.html
# svn checkout svn://svn.ffmpeg.org/ffmpeg/trunk ffmpeg
according to FFmpeg help on ubuntu, (https://wiki.ubuntu.com/ffmpeg)
current trunk is not stable because it's still changing so, it says to use revision 15261
# svn checkout -r 15261 svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg
# svn checkout svn://svn.ffmpeg.org/ffmpeg/trunk ffmpeg
according to FFmpeg help on ubuntu, (https://wiki.ubuntu.com/ffmpeg)
current trunk is not stable because it's still changing so, it says to use revision 15261
# svn checkout -r 15261 svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg