The ioctl error normally occurs if ivtv hasn't been
initialised with mpeg decoding. 
This probably also causes the mplayer error.
Do  something like
dd if=/dev/video0 of=/dev/video16 bs=64k count=50

and try again

John

--- Andrew Kohlsmith <[EMAIL PROTECTED]>
wrote:

> I've mentioned this same error several times on this
> list and every time that 
> I post the information below people stop responding
> to the thread...  Is this 
> something so blindingly obvious that I'm an idiot
> for not seeing it?
> 
> -A.
> 
> On Monday 27 June 2005 14:10, Andrew Kohlsmith
> wrote:
> > Ioctl IVTV_IOC_PREP_FRAME_YUV returned failed
> Error Invalid argument
> >         bitsPerPixel=32, depth=24,
> defaultVisual=TrueColor
> >         mask: ff0000,ff00,ff, offset: 16,8,0
> 
> 
>
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