The simpleslug pages mentioned AVFS. Tried it out. A 10 minute 2K planetarium show - Solar Quest - is seen as a 250 GB file after mounting. After Effects 4.1 complains error retrieving frame - not enough storage is available. But GL_warp2Avi works, even though it has the 2 GB file size limit for actual files, it seems to handle larger virtual avi files. Tested with 18 GB credits virtual avi file.