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avisynth: corrected interlace detection

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AviSynth works on frame-based video by default, which can
be either progressive or interlaced. Some filters can break
frames into half-height fields, at which point it considers
the clip to be field-based (avs_is_field_based can be used
to check for this situation).

To properly detect the field order of a typical video clip,
the frame needs to have been weaved back together already,
so avs_is_field_based should actually report 'false' when
checked.

Signed-off-by: Stephen Hutchinson <qyot27@gmail.com>
This commit is contained in:
emcodem 2021-05-24 17:03:49 +02:00 committed by Stephen Hutchinson
parent 66d4c72162
commit 05c492eeb0
1 changed files with 4 additions and 7 deletions
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11
libavformat/avisynth.c
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@ -250,15 +250,12 @@ 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)) {
/* AviSynth works with frame-based video, detecting field order can
* only work when avs_is_field_based returns 'false'. */
av_log(s, AV_LOG_TRACE, "avs_is_field_based: %d\n", avs_is_field_based(avs->vi));
if (avs_is_field_based(avs->vi) == 0) {
if (avs_is_tff(avs->vi)) {
st->codecpar->field_order = AV_FIELD_TT;
}