I'm trying to join two avi files using VirtualDub - I add both files then tell vdub to save the new file - it starts processing and the file just gets bigger and bigger - last night it wrote 25 gig to my second HD and filled it up w/o compleating the file. Both the subject files are divx5.0, pal, ac3 encode. What is going on here - I have the feeling that it really shouldn't be making a file of that size