[Mp4-tech] Unusual aspect ratio: portrait instead of landscape

[benoit.callebaut philips.com]

I,
I ask this just to be sure : Is it possible to encode a film in 3:4 or 
9:16 instead of the usual 4:3 or 16:9 to avoid rotation at decode time.
I want in fact to transcode a stream in portrait instead of landscape.  I 
didn't seen other aspect ratio in the bitstream definition other than the 
usuals ones for pixel aspect ratio field and source format field.
Does it exist other way to provides such strange aspect ratio in the 
bitstream or not ?
If not ,I ask myself if "somewhat misusing"  the standard ie using the 
reserved value for those fields as workaround is possible. I don't want to 
make something non standard but since the application is experimental and 
dedicated, It is a possibility if it exist no other solution. 
Thanks in advance
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