Andy,

Thanks for your quick and exhaustive response. I really appreciate it.
Now I know that problem is in the way how MythTV does standard switch
on ivtv-cards.
I'll copy your answer in comment to MythTV bugreport.

> There really is only one analog video and audio stream being processed
> by the CX23418 chip.  You can get it in multiple output formats - MPEG,
> YUV/HM12, PCM audio only - at the same time, but it's still the same
> video and audio stream.
>
> The cx18 driver automatically closing all analog streams (MPEG,
> YUV/HM12, PCM, VBI) when someone calls a VIDIOC_S_STD ioctl() on a
> device node would be considered a non-compliance with the V4L2 API.  I'm
> not sure it would be a desirable feature either.

Thanks,
Artem

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