We tested the last version of Gocoder application on two different versions of iPad (gen 2 and the last one).
Things goes fine while setting the iPad camera resolution to 720p (16:9 aspect ratio). The displayed aspect ratio is correct while playing stream in a embedded player (flowplayer).
However the same setup with a 640x360 resolution (the same 16:9 aspect ratio) gave us a distorted video while playing in a embedded player.
I do not know where is the limitation, but on the iPads screens the aspect ration seems ok for all resolutions. The distortion only appears while playing the stream.
Moreover I checked the logs of Wowza while publishing the 640x360 stream and the information about the incoming stream resolution is as expected 640x360.
In this situation we cannot exploit lower video definition with 16:9 aspect ratio and we have to do that because the 720p minimal stream bandwidth is 1Mbps but it does not fit a standard ADSL having less than 1Mbps upload bandwidth available.
It would be nice to have the aspect ratio respected for all resolutions and to be able to go below 1Mbps on 720p streams (700 or 800kbps should be ok).