Get the currently active decoder name.
The active decoder engine can vary depening on output constraints,
mostly non-resampling, integer output is accelerated via 3DNow & Co. but for
other modes a fallback engine kicks in.
Note that this can return a decoder that is only active in the hidden and not
available as decoder choice from the outside.
\param mh handle
\return The decoder name or NULL on error.
Get the currently active decoder name. The active decoder engine can vary depening on output constraints, mostly non-resampling, integer output is accelerated via 3DNow & Co. but for other modes a fallback engine kicks in. Note that this can return a decoder that is only active in the hidden and not available as decoder choice from the outside. \param mh handle \return The decoder name or NULL on error.