Its contents are meaningful only if the stream codec context is the one
actually used for encoding, which is often not the case (and is
discouraged).
Use AVCodecContext.field_order instead.
if (aspectn == 0 && aspectd == 1)
aspectd = 0; // 0:0 means unknown
- inter = 'p'; /* progressive is the default */
- if (st->codec->coded_frame && st->codec->coded_frame->interlaced_frame)
- inter = st->codec->coded_frame->top_field_first ? 't' : 'b';
+ switch (st->codec->field_order) {
+ case AV_FIELD_TT: inter = 't'; break;
+ case AV_FIELD_BB: inter = 'b'; break;
+ default: inter = 'p'; break;
+ }
switch (st->codec->pix_fmt) {
case AV_PIX_FMT_GRAY8: