+/**
+ * Write an ID3v2 tag.
+ * @param id3v2_version Subversion of ID3v2; supported values are 3 and 4
+ * @param magic magic bytes to identify the header
+ * If in doubt, use ID3v2_DEFAULT_MAGIC.
+ */
+int ff_id3v2_write(struct AVFormatContext *s, int id3v2_version, const char *magic);
+