Do you want something that will convert on device, or via a pc?

The line you might expect to work, when trying to convert, doesnt...
Knowing an effective command to re-encode video mdeia which is already in H264 format, so doesn't need converting, would be really handy. If specifying the codec is required to change profiles, what is the ffmpeg name on the N900 for the libav vcodec and acodec?

Oh, another reason the above might not work is that the -vpre preset seems to require the full file path. I read somewhere the order and combinations of presets can also make a difference. Dodn't know though.