Get FLV records stream but it won't play or convert

[paddyb]

I've been trying to record some video streams with GET FLV. It picks up the streams ok and downloads a movie sized file, but it when I try and play it with VLC I get the message:

No suitable decoder module:
VLC does not support the audio or video format "undf". Unfortunately there is no way for you to fix this.

Google suggests trying CCCP codec pack, but that didn't work. Media info only reports the file size and name, its as if there is not video there, yet the files are huge.

Any ideas?