HEVC interlaced encode issue

Hi Support team,

I try to use 2018 R2_1 sample to encode interlaced HEVC content.

Whether using software or hardware, I meet different issue.

When using HW encode:

command: sample_encode.exe h265 -i input.yuv -o output.265 -tff -w 1920 -h 1080 -f 120 -b 4000  -p 6fadc791a0c2eb479ab6dcd5ea9da347

I find the encoded bitstream resolution is 1920x540 but SPI.YUI.field_seq_flag and pic_struct value still is 0.

When using SW encode:

command: sample_encode.exe h265 -i input.yuv -o output.265 -tff -w 1920 -h 1080 -f 120 -b 4000  -p 2fca99749fdb49aeb121a5b63ef568f7

The SPI.YUI.field_seq_flag and pic_struct value is correct ( =1) but the encoded bitstream resolution is 1920x270.

I put the encoded bitstream at attached file. Thanks for your help.

System:

CPU: i7-8700@3.2GHz

GPU:UHD 630 (Driver: 25.20.100.6519)