Copy entries from one AVDictionary struct into another.
@param dst pointer to a pointer to a AVDictionary struct. If *dst is NULL,
this function will allocate a struct for you and put it in *dst
@param src pointer to source AVDictionary struct
@param flags flags to use when setting entries in *dst
@note metadata is read using the AV_DICT_IGNORE_SUFFIX flag
@return 0 on success, negative AVERROR code on failure. If dst was allocated
by this function, callers should free the associated memory.
Copy entries from one AVDictionary struct into another. @param dst pointer to a pointer to a AVDictionary struct. If *dst is NULL, this function will allocate a struct for you and put it in *dst @param src pointer to source AVDictionary struct @param flags flags to use when setting entries in *dst @note metadata is read using the AV_DICT_IGNORE_SUFFIX flag @return 0 on success, negative AVERROR code on failure. If dst was allocated by this function, callers should free the associated memory.