If you are looking for an alternative method to join the splited files using HJSplit program, there is one for Linux users. The tool is used to split and join a big file. The splited files are named in the format file_name.avi.001, file_name.avi.002 and so on by the tool.
Linux users, just use the 'cat' command to merge the files. The syntax that I used is as below:
$ cat file_name.avi.* > filename.avi
This works because the cat command takes filenames in alphabetical order and merges the files.
- Have fun.