Have you tried this method......
https://help.talend.com/r/en-US/8.0/delimited/tfileinputdelimited-tfilefetch-tsleep-tlogrow-reading-data-from-remote-file-in-streaming-mode-standard-component-this
The only difference to the above would be that you are working from an FTP location. This post may help you adjust the method described in help.talend.com .....
https://community.talend.com/s/feed/0D73p000004kLJTCA2?language=en_US
