Noone else responded to this so I guess I'll give it a go, but I don't
know much about it. first of all, for /dev/video48 (and /dev/video16?)
should probably be noted that they are pvr-350 only.

> /dev/video32
> The raw video capture device(s)
> Read-only
>
> The raw YUV video output from the current video input. Apparently the
> YUV format is non-standard and you may need special software to read
> this.
The format is HME12 I think, and there is a yuv_fixup=1 module option
to convert it to some other format in the driver. See
http://www.gossamer-threads.com/lists/ivtv/devel/24782 and
http://www.gossamer-threads.com/lists/ivtv/devel/22382 for more info.
Essentially, without the fixup option, framerate, dimensions, etc.
have to all be set individually, but it definately does work with
mplayer / mencoder. Sounds also like this works for the the
150/250/350/500.

> /dev/video48
> The raw video display device(s)
> Write-only
>
> Writes a YUV stream to the decoder of the card. Does not currently
> work. This is on the TODO list but at a low priority.
> --------------------------

This is what XV support is, I'm pretty sure. So that info is wrong. Maybe:

Writes a YUV stream to the decoder of the card. The best way to do
this is with the X driver's XV acceleration support. The card can use
hardware scaling for videos smaller than 720x576; software scaling
will be used for larger videos.

There should also be info here on where to look for info on the X
driver and configuring X.

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