This seems to fail without reason.... I'm encoding with the latest XviD to AVI format, with standard settings.... Not sure why, but the resulting file has no duration and is a whopping 197 KB. O.o
Running Windows Vista Home Edition on my laptop, with 2GB RAM and a 1.8GHz Core2 Duo.
Source files are MPEG-4 XviD AVI as well, @ 23fps. Standard 640x480 NTSC square pixel. (Same as the new render.)