hey,

i did a little more research about the mpeg1 issue.
we have to make some changes to the driver to support mpeg1.

(1) at the moment the video decoder resolution is always the same as the 
resolution of the mpeg-encoder. for mpeg1 we need to (a) limit the vertical 
resolution to 240 ( 288 ) and (b) fix set the the vertical resolution of the 
video 
decoder to 480 ( 576 ) be set to 1 for mpeg 1.

(2) the aspect ratio has to set to 1 for mpeg1.


at the moment the resolution of both video decoder and mpeg encoder gets 
changed in the same place ( the v4l fmt ioctl ). to make it right  we also need 
to consider the stream_type ( mpeg1 ( system stream ) or not ) and care 
about the transitions mpeg1<->mpeg2.

i can do the programming, if a get a little hint where in the driver i should 
do it.
i would choose ivtv_setup_v4l_encode_stream() but probably that is not a very 
good choice.


thanks,
ben


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