peut etre n´ a tu pas installé le necessaire, je sais pas si sa a un rapport, mais je crois que tu as besoin de codecs aussi bien pour le son que la videos, moi j´ ai installé sous suse:
mad:
MAD is a high-quality MPEG audio decoder. It currently supports MPEG-1 and the MPEG-2 extension to Lower Sampling Frequencies, as well as the so-called MPEG 2.5 format. All three audio layers ( Layer I, Layer II, and Layer III a.k.a. MP3) are fully implemented.
libmpeg3:
LibMPEG3 decodes many derivatives of MPEG standards into uncompressed data suitable for editing and playback: Audio Layer II and Layer III ( AC3 has been disabled for legal reasons), MPEG-1 and MPEG-1 video, MPEG-1 and MPEG-2 system streams
Et il y en a d´ autres...
Et je ne te parle pas des packages pour encoder, mais décoder 