[vdr] Grab image failed

[Darren Salt]

I demand that Luis Palacios may or may not have written...

> Softdevice seems not to be the cause of the problem, GRAB doesn't
> work either without it.

cDevice::GrabImage (the default) returns NULL, i.e. grab always fails, so
cSoftDevice needs to override this (much as cXineDevice in vdr-xine does for
older VDR or, with a patch which I posted here a few weeks ago, for current
VDR).

vdr/dvbdevice.c contains code which you can probably adapt for this.

[snip]
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