Optical flow using Hybrid -- Possible?

[Selur]

A source clip can have flags regarding whether they are interlaced or not, but like the normal interlaced info it often is not reliable.
If you call

ffprobe -i "<path to input>" -show_frames

you get data like:

[FRAME]
media_type=video
stream_index=0
key_frame=0
pts=149673
pts_time=1.663033
pkt_dts=151473
pkt_dts_time=1.683033
best_effort_timestamp=149673
best_effort_timestamp_time=1.663033
pkt_duration=1800
pkt_duration_time=0.020000
pkt_pos=532604
pkt_size=87443
width=1920
height=1080
pix_fmt=yuv420p
sample_aspect_ratio=1:1
pict_type=P
coded_picture_number=5
display_picture_number=0
interlaced_frame=1
top_field_first=1
repeat_pict=0
color_range=tv
color_space=bt709
color_primaries=bt709
color_transfer=bt709
chroma_location=left
[/FRAME]

Some deinterlacers use these,...
Problem is that just because a frame is interlaced, doesn't mean it shows combing. Sometimes progressive input is encoded with an interlaced flag or telecined contend it flagged as progressive or vise versa.

Cu Selur