FORM_TAG           41 libavformat/rl2.c #define FORM_TAG MKBETAG('F', 'O', 'R', 'M')
FORM_TAG           35 libavformat/wc3movie.c #define FORM_TAG MKTAG('F', 'O', 'R', 'M')
FORM_TAG           43 libavformat/westwood.c #define FORM_TAG MKBETAG('F', 'O', 'R', 'M')