void ff_check_pixfmt_descriptors(void);
+/**
+ * Set a dictionary value to an ISO-8601 compliant timestamp string.
+ *
+ * @param s AVFormatContext
+ * @param key metadata key
+ * @param timestamp unix timestamp in microseconds
+ * @return <0 on error
+ */
+int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp);
+
extern const uint8_t ff_reverse[256];
#endif /* AVUTIL_INTERNAL_H */