From: emcodem <emco...@ffastrans.com>
Fixes Trac ticket #8757
Signed-off-by: Stephen Hutchinson <qyo...@gmail.com>
---
Resubmitting with my signed-off so that it's clear that
I've given final approval and it shows up in Patchwork.
libavformat/avisynth.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/libavformat/avisynth.c b/libavformat/avisynth.c
index f029a0e842..923c645bfb 100644
--- a/libavformat/avisynth.c
+++ b/libavformat/avisynth.c
@@ -243,6 +243,23 @@ static int avisynth_create_stream_video(AVFormatContext
*s, AVStream *st)
st->nb_frames = avs->vi->num_frames;
avpriv_set_pts_info(st, 32, avs->vi->fps_denominator,
avs->vi->fps_numerator);
+ av_log(s, AV_LOG_TRACE, "avs_is_field_based: %d\n",
avs_is_field_based(avs->vi));
+ av_log(s, AV_LOG_TRACE, "avs_is_parity_known: %d\n",
avs_is_parity_known(avs->vi));
+
+ /* The following typically only works when assumetff (-bff) and
+ * assumefieldbased is used in-script. Additional
+ * logic using GetParity() could deliver more accurate results
+ * but also decodes a frame which we want to avoid. */
+ st->codecpar->field_order = AV_FIELD_UNKNOWN;
+ if (avs_is_field_based(avs->vi)) {
+ if (avs_is_tff(avs->vi)) {
+ st->codecpar->field_order = AV_FIELD_TT;
+ }
+ else if (avs_is_bff(avs->vi)) {
+ st->codecpar->field_order = AV_FIELD_BB;
+ }
+ }
+
switch (avs->vi->pixel_type) {
/* 10~16-bit YUV pix_fmts (AviSynth+) */
case AVS_CS_YUV444P10:
--
2.27.0
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