Aqui dejo la lista definitiva de los ficheros multimedia que soporta el Xtreamer.
La siguiente es una lista completa indicando todo el audio, vídeo y formatos de subtítulos que se admiten en cada contenedor.

SUPPORTED AUDIO/VIDEO CONTAINERS: -
AVI
Video – MPEG-4.2 up-to ASP@L5.0² | WMV9 up-to MP@HL | AVC up-to MP@L4.0 |
Audio – MP2 | MP3 | AAC (LC/HE/PS)¹ | Dolby Digital (AC3)* | DTS/DTS-ES* | LPCM¹ | Vorbis¹ |
Subtitles – SRT (as an external text file) | SSA (as an external text file) | SUB (as an external text file) | IDX/SUB (as an external text/graphics file) |
Chapters – None |

BLU-RAY.ISO
Video – AVC up-to HP@L4.1 | VC-1 up-to AP@L3 | MPEG-2 up-to MP@HL |
Audio – Dolby Digital (AC3)* | DTS/DTS-ES* | LPCM | ‡ |
Subtitles – PGS (SUP) |
Chapters – Supported (available via “GOTO/5″ button on RC |
Menu’s – Not Supported

DAT (VCD)
Video – MPEG-1 |
Audio – MP2 |
Subtitles – Not Supported |
Chapters – Not Supported |

DIVX
Video – MPEG-4.2 up-to ASP@L5.0² |
Audio – MP3 | Dolby Digital (AC3)* |
Subtitles – DivXSubs |
Chapters – Not Supported |

DVD.ISO
Video – MPEG-1 | MPEG-2 up-to MP@ML |
Audio – MP2 | Dolby Digital (AC3)* | DTS/DTS-ES* |
Subtitles – VOBsub (IDX/SUB) |
Chapters – Supported |
Menu’s – Supported |

FLV
Video – AVC up-to MP@L5.0 |
Audio – AAC (LC/HE/PS) | MP2 | MP3 |
Subtitles – Not Supported |
Chapters – Not Supported |

M2TS/M2T/MTS (Transport)
Video – AVC up-to HP@L4.1 | VC-1 up-to AP@L3 | MPEG-2 up-to MP@HL |
Audio – AAC (LC/HE/PS) | MP2 | MP3 | Dolby Digital (AC3)* | DTS/DTS-ES* | LPCM | ‡ |
Subtitles – SUP | SRT |
Chapters – Not Supported |

MKV
Video – MPEG-4.2 up-to ASP@L5.0² | AVC up-to HP@L4.1 | VC-1 up-to AP@L3 | MPEG-1 | MPEG-2 up-to MP@HL |
Audio – AAC (LC/HE/PS) | MP2 | MP3 | Dolby Digital (AC3)* | DTS/DTS-ES* | LPCM³ | Vorbis | FLAC | ‡ |
Subtitles – PGS (SUP) | SRT | ASS/SSA | IDX/SUB |
Chapters – Supported (available via “|<<” and “>>|” buttons) |

MOV/M4V
Video – MPEG-4.2 up-to SP@L3 | AVC up-to MP@L5.0 | MJPEG |
Audio – AAC-LC | MP3 | LPCM³ |
Subtitles – Not Supported |
Chapters – Not Supported |

MP4
Video – MPEG-4.2 up-to ASP@L5.0² | AVC up-to HP@L4.1 |
Audio – AAC (LC/HE/PS) | MP2 | MP3 | Dolby Digital (AC3)* |
Subtitles – TTXT | VOBsub (IDX/SUB) |
Chapters – Not Supported |

MPG/MPEG (Program)
Video – MPEG-1 | MPEG-2 up-to MP@HL |
Audio – MP2 | MP3 | Dolby Digital (AC3)* | DTS/DTS-ES* |
Subtitles – None |
Chapters – None |

OGM
Video – MPEG-4.2 up-to ASP@L5.0² |
Audio – MP3 | LPCM | Vorbis |
Subtitles – SRT |
Chapters – Not Supported |

RM/RMVB (RealMedia)
Video – 8 (RV30) | 9/10 (RV40) |
Audio – Cook/G2 | AAC (LC/HE/PS) |
Subtitles – Not Supported |
Chapters – Not Supported |

TS/TP/TRP (Transport)
Video – AVC up-to HP@L4.1 | VC-1 up-to AP@L3 | MPEG-1 | MPEG-2 up-to MP@HL |
Audio – AAC (LC/HE/PS) | MP2 | MP3 | Dolby Digital (AC3)* | DTS/DTS-ES* | LPCM³ |
Subtitles – SUP | SRT |
Chapters – Not Supported |

WMV
Video – WMV9 up-to MP@HL |
Audio – WMA / WMA Pro |
Subtitles – None |
Chapters – None |

SUPPORTED AUDIO CONTAINERS: -
M4A/MP4 – AAC-LC/HE/PS | MPEG-1 Layer-2 (MP2) | MPEG-1 Layer-3 (MP3) | Dolby Digital (AC3)* |
MKA – AAC (LC/HE/PS) | MPEG-1 Layer-2 (MP2) | MPEG-1 Layer-3 (MP3) | Dolby Digital (AC3)* | DTS/DTS-ES* | LPCM³ | Vorbis | FLAC |
MPA – MPEG-1 Layer-1 (MP1) | MPEG-1 Layer-2 (MP2) | MPEG-1 Layer-3 (MP3) |
OGG – Vorbis |
RA/RAM – Cook/G2 | AAC (LC/HE/PS) |
WAV – LPCM | AC3* | DTS* |

SUPPORTED ELEMENTARY AUDIO & VIDEO STREAMS: -
Audio – AAC (LC/HE/PS) | MPEG-1 Layer-2 (MP2) | MPEG-1 Layer-3 (MP3) | Dolby Digital (AC3)* | DTS/DTS-ES* | FLAC | FLC | WMA |
Video – M1V | M2V |

PICTURE FORMATS: -
Compressed – JPEG/JPG | GIF |
Lossless – BMP (Windows Bitmap) | PNG (Portable Graphics) |

STREAMING FORMATS: -
Audio/Video – RTSP | FLV (AVC video with AAC audio) | MOV (AVC video with AAC audio) | MP4 (AVC video with AAC audio) |
Audio Radio – PLSX (MP3 or AAC streams) |

¹ Not recommended | ² With 1-warp-point maximum | ³ Not less than 32KHz@16-bit |
‡ Licence Permitting – Dolby Digital Plus/Dolby TrueHD* | DTS-HD Master Audio/DTS-HD High Resolution* |
* Bit-stream pass-through to suitable amplifier or Down-mixed to a 2Ch PCM stream when passed to TV |
Fuente: http://forum.xtreamer.net/viewtopic.php?f=2&t=11163#p81631