después de estar un rato tocando la configuración del daphne ahora me crea un archivo log que me dice lo siguiente:
--DAPHNE version 0.99.7cvs
--Command line is: C:\Daphne\daphne.exe mach3 vldp -framefile C:\Daphne\framefile\mach3_framefile.txt -blank_skips -blank_searches
--CPU : GenuineIntel 1500 MHz || Mem : 1024 megs
--OS : Windows XP/.NET || Video : Intel(R) 82852/82855 GM/GME Graphics Controller
error: palette_set_transparent_number out of range
Set 640x480 at 32 bpp with flags: 0
Initializing sound system ...
No joysticks detected
Loading roms/mach3/m3rom4.bin ... 8192 bytes read into memory
Loading roms/mach3/m3rom3.bin ... 8192 bytes read into memory
Loading roms/mach3/m3rom2.bin ... 8192 bytes read into memory
Loading roms/mach3/m3rom1.bin ... 8192 bytes read into memory
Loading roms/mach3/m3rom0.bin ... 8192 bytes read into memory
Loading roms/mach3/mach3fg3.bin ... 8192 bytes read into memory
Loading roms/mach3/mach3fg2.bin ... 8192 bytes read into memory
Loading roms/mach3/mach3fg1.bin ... 8192 bytes read into memory
Loading roms/mach3/mach3fg0.bin ... 8192 bytes read into memory
Loading roms/mach3/m3target.bin ... 971776 bytes read into memory
Loading roms/mach3/mach3bg0.bin ... 4096 bytes read into memory
Loading roms/mach3/mach3bg1.bin ... 4096 bytes read into memory
Loaded 4096 bytes from mach3.gz
Booting ROM ...
REMOVE ME : coin queue was reshuffled
PR-8210 : reject received (ignored)
LDP-VLDP.CPP : in play() function, could not open mpeg file C:\Daphne\theory\mach3.mpg
VLDP ERROR : play command failed!
LDP.CPP WARNING : play() less accurate because timers were reset
LDP : Since disc was stopped, we are flushing the timers (remove me later)
REMOVE ME : coin queue was reshuffled
Play
Search to 1 received
LDP-VLDP.CPP : Could not open video file C:\Daphne\theory\mach3.mpg
NOTE: converting FPS from 29.970000 to 0.000000. This may be less accurate.
LDP-VLDP.CPP : Search failed in video or audio file
REMOVE ME : coin queue was reshuffled

No entiendo nada, más concretamente lo de "NOTE: converting FPS from 29.970000 to 0.000000. This may be less accurate.
LDP-VLDP.CPP : Search failed in video or audio file
REMOVE ME : coin queue was reshuffled"
¿puede ser que el archivo de video tenga que ser dividido?.
En definitiva, que no tengo ni idea así que si hay alguien al que se le ocurra algo...