qui
riva encoder

codice:
At the moment the following video codecs are supported: 

AVI

Cinepak Codec by Radius, Cinepak by Supermac 
Intel Indeo(R) Video R3.2 
Microsoft Video 1 
Microsoft RLE 
XviD 
DivX 3 Lower Motion, DivX 4, DivX 5 
TechSmith Screen Capture Codec (TSCC)
MPEG

MPEG-1 (VCD) 
MPEG-2 (SVCD.DVD) 
MPEG-4 (XviD, MP4, 3GPP)
Quicktime

Sorenson Video 3 Pro with the audio codec MP3, IMA 4:1 (nicht QDesign Standard und Qualcomm PureVoice) or wihtout audio 
Exported from Quicktime Pro 
Not supported: Exported from Adobe Premiere 
Not supported: QDM2 Audio Codec
Windows Media Video 

WMV 7, WMV 8 
MPEG-4 V3 
ISO MPEG-4 V1 
Not supported: WMV 9