Mi lehet a gond?

A dvdshrink elkészíti az m2v és ac3 fájlokat. Ezután jönne az mplex, melynek a két fájl összemixelése lenne a dolga.
De nem teszi:
csablak:~/videos/FRAKK_A_MACSKAK_REME$ mplex -f 8 -S 0 -o final.mpg FRAKK.m2v FRAKK.ac3
  INFO: [mplex] mplex version 1.8.0 (2.2.4 $Date: 2005/08/28 17:50:54 $)
  INFO: [mplex] File FRAKK.m2v looks like an MPEG Video stream.
  INFO: [mplex] File FRAKK.ac3 looks like an AC3 Audio stream.
  INFO: [mplex] Video stream 0: profile 8 selected – ignoring non-standard options!
  INFO: [mplex] Found 1 audio streams and 1 video streams
  INFO: [mplex] Selecting dvdauthor DVD output profile
  INFO: [mplex] Multiplexing video program stream!
  INFO: [mplex] Scanning for header info: Video stream e0 (FRAKK.m2v)
  INFO: [mplex] VIDEO STREAM: e0
  INFO: [mplex] Frame width    : 720
  INFO: [mplex] Frame height    : 576
  INFO: [mplex] Aspect ratio    : 4:3 display
  INFO: [mplex] Picture rate    : 25.000 frames/sec
  INFO: [mplex] Bit rate        : 8500000 bits/sec
  INFO: [mplex] Vbv buffer size : 229376 bytes
  INFO: [mplex] CSPF            : 0
  INFO: [mplex] Scanning for header info: AC3 Audio stream 00 (FRAKK.ac3)
  INFO: [mplex] AC3 frame size = 768
  INFO: [mplex] AC3 AUDIO STREAM:
  INFO: [mplex] Bit rate      :    24576 bytes/sec (192 kbit/sec)
  INFO: [mplex] Frequency      :    48000 Hz
  INFO: [mplex] SYSTEMS/PROGRAM stream: