Check if given option is set to its default value.
@param obj AVClass object to check option on
@param name option name
@param search_flags combination of AV_OPT_SEARCH_*
@return >0 when option is set to its default,
0 when option is not set its default,
<0 on error
Check if given option is set to its default value.
@param obj AVClass object to check option on @param name option name @param search_flags combination of AV_OPT_SEARCH_* @return >0 when option is set to its default, 0 when option is not set its default, <0 on error