FF_MOV_FLAG_USE_MDTA 84 libavformat/movenc.c { "use_metadata_tags", "Use mdta atom for metadata.", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_USE_MDTA}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" }, FF_MOV_FLAG_USE_MDTA 3755 libavformat/movenc.c if (mov->flags & FF_MOV_FLAG_USE_MDTA) { FF_MOV_FLAG_USE_MDTA 3876 libavformat/movenc.c } else if (mov->mode == MODE_MOV && !(mov->flags & FF_MOV_FLAG_USE_MDTA)) { // the title field breaks gtkpod with mp4 and my suspicion is that stuff is not valid in mp4