/* Derive top_field_first from field pocs. */
cur->f->top_field_first = cur->field_poc[0] < cur->field_poc[1];
} else {
- if (cur->f->interlaced_frame || h->sps.pic_struct_present_flag) {
+ if (h->sps.pic_struct_present_flag) {
/* Use picture timing SEI information. Even if it is a
* information of a past frame, better than nothing. */
if (h->sei_pic_struct == SEI_PIC_STRUCT_TOP_BOTTOM ||
cur->f->top_field_first = 1;
else
cur->f->top_field_first = 0;
+ } else if (cur->f->interlaced_frame) {
+ /* Default to top field first when pic_struct_present_flag
+ * is not set but interlaced frame detected */
+ cur->f->top_field_first = 1;
} else {
/* Most likely progressive */
cur->f->top_field_first = 0;