Trying to transcode 720 progressive or 1080 progressive to 1080 interlaced, TFF.
“Interlaced” and “Top Field First” are selected in “Video” box of advanced export settings.
MediaInfo reports the scan type of exported video is still Progressive.
FWIW, I’m told ffmpeg needs -vf tinterlace=4 to do proper interlacing, top field first.
-vf tinterlace=5 gives bottom field first.
When making this conversion the interlaced frame rate (2 fields) should be half the progressive frame rate, e.g. 59.94 frames progressive would be 29.97 frames interlaced.