AVFieldOrder     1980 libavcodec/avcodec.h     enum AVFieldOrder field_order;
AVFieldOrder     4367 libavcodec/avcodec.h     enum AVFieldOrder field_order;
AVFieldOrder     1052 libavformat/mov.c     enum AVFieldOrder decoded_field_order = AV_FIELD_UNKNOWN;
AVFieldOrder       41 libavformat/yuv4mpegdec.c     enum AVFieldOrder field_order = AV_FIELD_UNKNOWN;