I recently upgraded to Fedora 10 with the corresponding rpms from rpmfusion.org mplayer-1.0-0.102.20080903svn.fc10.x86_64 ffmpeg-0.4.9-0.52.20080908.fc10.x86_64 ffmpeg-libs-0.4.9-0.52.20080908.fc10.x86_64 mplayer hangs on playback of any .m4a file that was created with faac. This previously worked under Fedora 9 with rpms from rpm.livna.org. The .m4a file is working with vlc, ffplay, rhythmbox. mplayer/Fedora 10 works on many other media files such as ogg, mp3, flv. Here is the -v output: Playing track01.m4a. get_path('sub/') -> '/home/richard/.mplayer/sub/' [file] File size is 4607093 bytes STREAM: [file] track01.m4a STREAM: Description: File STREAM: Author: Albeu STREAM: Comment: based on the code from ??? (probably Arpi) LAVF_check: QuickTime/MPEG-4/Motion JPEG 2000 format libavformat file format detected. stream_seek: WARNING! Can't seek to 0x464C75 ! and it just sits there spinning CPU. Ctrl-C gives MPlayer interrupted by signal 2 in module: demux_open so it seems to be a hang in the demuxer. Any suggestions? Tks. The .m4a file is too large to post here but if anyone is willing try on Fedora 10/rpmfusion please shout.