I used the denobis patched version to download the file but I don't think that this should be the reason for your corrupted file.So you should try to check the downloaded file itself with any video tools what infos they give you.
Can you play the rtmp link with your VLC directly without to download?Try to check it with VirtualDub for exsample + any flv/mp4 filter plugin for directshow.
Maybe the problem is really your OS + rtmpdump compiled version.On the other hand if only this video link makes trouble then download the video via windows (VMWare).
greetz