[FFmpeg-user] Is it possible to use ffmpeg as a rtmp downloader like rtmpdump?

[Xu Pu Ti]

A simple 'ffmpeg -i rtmp://url -c copy -f flv -' is not expected, since ffmpeg
cares too much about the actual content of the stream and will complain about
bad flv tags and ignore tags it doesn't understand.

Is it possible to make ffmpeg just download from rtmp and save it as a flv file
and do not inspect what it contains?