dl ffmpegX -
http://www.versiontracker.com/dyn/moreinfo/macosx/15473
- where it says source format, drop your avi file there
- where it says target format, choose either DVD mpeg2enc, or DVD ffmpeg, mpeg2enc takes longer but quality is better(from my experience).
-under the options tab select author as DVD & encode with quicktime.
- then press encode... your result will be and .DVD folder that contains 2 folders, AUDIO_TS and VIDEO_TS
- in ffmpegX yu can select the options tab and select the img tab
- select browse find your .dvd folder select go
- in disk utility drag that .img file to the let side and select burn
let me know how that works