Set the values of all AVOption fields to their default values. Only these
AVOption fields for which (opt->flags & mask) == flags will have their
default applied to s.
@param s an AVOption-enabled struct (its first member must be a pointer to AVClass)
@param mask combination of AV_OPT_FLAG_*
@param flags combination of AV_OPT_FLAG_*
Set the values of all AVOption fields to their default values. Only these AVOption fields for which (opt->flags & mask) == flags will have their default applied to s.
@param s an AVOption-enabled struct (its first member must be a pointer to AVClass) @param mask combination of AV_OPT_FLAG_* @param flags combination of AV_OPT_FLAG_*