please excuse my bad english

For most xvid files the server works pretty fine, but some crash transcoding. When i let show the transcoder console window, for not working files, the window splashs up shortly and then it´s away, so i can´t see any information. I think transconding crashes for some reason, but Why? I can´t see the difference between working and not working files, all are xvid/divx. Transcoding profile is Movies primary 1920x1080 streaming to Sony TV (DLNA, 16:9, 1920x1080).
some idea?