The returned entry key or value must not be changed, or it will
cause undefined behavior.
To iterate through all the dictionary entries, you can set the matching key
to the null string "" and set the AV_DICT_IGNORE_SUFFIX flag.
@param prev Set to the previous matching element to find the next.
If set to NULL the first matching element is returned.
@param key matching key
@param flags a collection of AV_DICT_* flags controlling how the entry is retrieved
@return found entry or NULL in case no matching entry was found in the dictionary
Get a dictionary entry with matching key.
The returned entry key or value must not be changed, or it will cause undefined behavior.
To iterate through all the dictionary entries, you can set the matching key to the null string "" and set the AV_DICT_IGNORE_SUFFIX flag.
@param prev Set to the previous matching element to find the next. If set to NULL the first matching element is returned. @param key matching key @param flags a collection of AV_DICT_* flags controlling how the entry is retrieved @return found entry or NULL in case no matching entry was found in the dictionary