Instead of referring to the /Video folder, try the mnt folder.

So your file goes from being located here;
ftp://HumaxFTP:0000@192.168.1.82/Video/The Hours_20100111_2237.ts

to here:

ftp://HumaxFTP:0000@192.168.1.82/mnt/hd3/Video/The Hours_20100111_2237.ts

Not sure it'll make any difference though.

Unfortunately not

A particular file can be referenced either way as the Video directory is a symlink (and I managed to find a file that didn't contain a space, so got rid of that red herring!):

# ls -l /media
lrwxrwxrwx 1 root root 14 Jan 1 2000 Music -> /mnt/hd4/Music
lrwxrwxrwx 1 root root 14 Jan 1 2000 Photo -> /mnt/hd4/Photo
lrwxrwxrwx 1 root root 14 Jan 1 2000 Video -> /mnt/hd3/Video

# ls -l /mnt/hd3/Video/Priceless_20110109_2201.ts
-rw-r--r-- 1 root root 2860915200 Jan 9 23:40 /mnt/hd3/Video/Priceless_20110109_2201.ts

# ls -l /media/Video/Priceless_20110109_2201.ts
-rw-r--r-- 1 root root 2860915200 Jan 9 23:40 /media/Video/Priceless_20110109_2201.ts

I can "get" a file by using the absolute path on the Humax (calling it foo.ts on my Mac):

ftp> get /mnt/hd3/Video/Priceless_20110109_2201.ts foo.ts
local: foo.ts remote: /mnt/hd3/Video/Priceless_20110109_2201.ts
502 Command not implemented.
200 Port command successful
150 Opening data connection for directory list
11896 KiB 3.87 MiB/s

However, the usual way of referencing it doesn't work, I've tried at least:

ftp://HumaxFTP:0000@192.168.1.82//mn...110109_2201.ts
ftp://HumaxFTP:0000@192.168.1.82/mnt...110109_2201.ts
ftp://HumaxFTP:0000@192.168.1.82//me...110109_2201.ts
ftp://HumaxFTP:0000@192.168.1.82/med...110109_2201.ts
ftp://HumaxFTP:0000@192.168.1.82/Vid...110109_2201.ts

Looks to me like the conversation between VLC and the FTP server doesn't go according to plan,

access_ftp debug: ftp_SendCommand:"SIZE /mnt/hd3/Video/Priceless_20110109_2201.ts"
access_ftp debug: answer=500 Syntax error, command unrecognized.
access_ftp debug: cannot get file size
access_ftp debug: will try to get directory contents
access_ftp debug: ftp_SendCommand:"CWD /mnt/hd3/Video/Priceless_20110109_2201.ts"
access_ftp debug: answer=530 Requested action not taken.
access_ftp error: file or directory doesn't exist
main debug: no access module matching "ftp" could be loaded
main debug: TIMER module_need() : 54.461 ms - Total 54.461 ms / 1 intvls (Avg 54.461 ms)
main debug: waitpipe: object killed

To me above it looks like the SIZE command hasn't been implemented in the FTP server on the Humax, this is when I am using a normal FTP client:

ftp> size
(remote-file) /mnt/hd3/Video/Priceless_20110109_2201.ts
500 Syntax error, command unrecognized.

That would not appear to be fatal for the communication, however the use of the CWD command by VLC would appear to be ("CWD /mnt/hd3/Video/Priceless_20110109_2201.ts") and confuses me:

ftp> cd /mnt/hd3/Video/Priceless_20110109_2201.ts
530 Requested action not taken.
ftp> cd /mnt/hd3/Video/
250 File action is successful. Proceed.

That would point more to a problem with VLC...

Anyway that's it from me for now, interesting stuff anyway ...!

I've managed to play an MP3 that resides on my Humax HDD using windows media player but I can't get vlc player to work.
If you right click on the file within filezilla (or your chosen ftp program) and save path to clipboard you can then paste the directory path into WMP.

spaces come up as %20
and add the :0000 password after the HumaxFTP
eg

ftp://HumaxFTP:oooo@192.168.0.4/mnt/...0-%20Scoop.mp3