It seems to work fine in NVEnc 8.03 with my several tests.

Would you please let me know the exact command line and the details of the input file (format, codec, resolution, framerate, etc)?

I then did some more testing with the new v8.04 and finally found the reason for the failure was "--avsw" (the default value of my gui), "--avhw" was OK. But in v7.82 both were successful. Here are my test information:

Original Video Info:

General
Complete name                  : E:\Download\Aria2Down\Test.VOB
Format                         : MPEG-PS
File size                      : 1 024 MiB
Duration                       : 16 min 59 s
Overall bit rate mode          : Variable
Overall bit rate               : 8 423 kb/s
Frame rate                     : 25.000 FPS

Video
ID                             : 224 (0xE0)
Format                         : MPEG Video
Format version                 : Version 2
Format profile                 : Main@Main
Format settings                : CustomMatrix / BVOP
Format settings, BVOP          : Yes
Format settings, Matrix        : Custom
Format settings, GOP           : M=3, N=12
Format settings, picture struc : Frame
Duration                       : 16 min 59 s
Bit rate mode                  : Variable
Bit rate                       : 7 584 kb/s
Maximum bit rate               : 9 000 kb/s
Width                          : 720 pixels
Height                         : 576 pixels
Display aspect ratio           : 4:3
Frame rate                     : 25.000 FPS
Standard                       : PAL
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Interlaced
Scan order                     : Top Field First
Compression mode               : Lossy
Bits/(Pixel*Frame)             : 0.731
Time code of first frame       : 00:00:15:12
Time code source               : Group of pictures header
GOP, Open/Closed               : Open
Stream size                    : 922 MiB (90%)

Encode Info:

1. Test-8.04-avsw

NVEncC64.exe --avsw -i "E:\Download\Aria2Down\Test.VOB" --video-metadata clear --metadata clear -c hevc --vbr 2500 --bframes 3 --ref 3 --bref-mode each --preset quality --tier main --lookahead 16 --no-aq --level 3.1 --multipass 2pass-full --mv-precision Q-pel --avsync cfr --interlace tff --vpp-yadif -o "E:\Output\Test-8.04-avsw.mp4"
--------------------------------------------------------------------------------
E:\Output\Test-8.04-avsw.mp4
--------------------------------------------------------------------------------
NVEncC (x64) 8.04 (r3322) by rigaya, Apr 22 2025 12:29:16 (VC 1929/Win)
OS Version     Windows 10 x64 (19044) [UTF-8]
CPU            AMD Ryzen 5 5600 6-Core Processor [4.45GHz] (6C/12T)
GPU            #0: NVIDIA GeForce GTX 1660 (1408 cores, 1785 MHz)[PCIe3x16][572.61]
NVENC / CUDA   NVENC API 13.0, CUDA 12.8, schedule mode: auto
Input Buffers  CUDA, 32 frames
Input Info     avsw: mpeg2video(yv12)->nv12 [AVX2], 720x576, 25/1 fps
Vpp Filters    cspconv(nv12 -> yv12)
               yadif: mode auto
               cspconv(yv12 -> nv12)
Output Info    H.265/HEVC main @ Level 3.1
               720x576p 16:15 25.000fps (25/1fps)
               avwriter: hevc => mp4
Encoder Preset quality
Rate Control   VBR
Multipass      2pass-full
Bitrate        2500 kbps (Max: 9600 kbps)
Target Quality auto
QP range       I:0-51  P:0-51  B:0-51
QP Offset      cb:0  cr:0
VBV buf size   auto
Split Enc Mode auto
Lookahead      on, 16 frames, Level 0, Adaptive I, B Insert
GOP length     250 frames
B frames       3 frames [ref mode: each]
Ref frames     3 frames, MultiRef L0:auto L1:auto
AQ             off
CU max / min   auto / auto
Others         mv:Q-pel
[mpeg2video @ 0000000003ef3180] ac-tex damaged at 39 1500:00, GPU 13%, VE 98%, est out size 306.8MB
[mpeg2video @ 0000000003ef3180] Warning MVs not available

encoded 25494 frames, 495.21 fps, 2542.36 kbps, 309.06 MB
encode time 0:00:51, CPU: 11.8%, GPU: 11.7%, VE: 98.0%, GPUClock: 1914MHz, VEClock: 1779MHz
frame type IDR   336
frame type I     336,  avgQP  23.00,  total size    9.45 MB
frame type P   10783,  avgQP  21.62,  total size  177.71 MB
frame type B   14375,  avgQP  24.82,  total size  121.90 MB

2. Test-8.04-avhw

NVEncC64.exe --avhw -i "E:\Download\Aria2Down\Test.VOB" --video-metadata clear --metadata clear -c hevc --vbr 2500 --bframes 3 --ref 3 --bref-mode each --preset quality --tier main --lookahead 16 --no-aq --level 3.1 --multipass 2pass-full --mv-precision Q-pel --avsync cfr --interlace tff --vpp-yadif -o "E:\Output\Test-8.04-avhw.mp4"
--------------------------------------------------------------------------------
E:\Output\Test-8.04-avhw.mp4
--------------------------------------------------------------------------------
NVEncC (x64) 8.04 (r3322) by rigaya, Apr 22 2025 12:29:16 (VC 1929/Win)
OS Version     Windows 10 x64 (19044) [UTF-8]
CPU            AMD Ryzen 5 5600 6-Core Processor [4.38GHz] (6C/12T)
GPU            #0: NVIDIA GeForce GTX 1660 (1408 cores, 1785 MHz)[PCIe3x16][572.61]
NVENC / CUDA   NVENC API 13.0, CUDA 12.8, schedule mode: auto
Input Buffers  CUDA, 32 frames
Input Info     avcuvid: MPEG2, 720x576, 25/1 fps
Vpp Filters    cspconv(nv12 -> yv12)
               yadif: mode auto
               cspconv(yv12 -> nv12)
Output Info    H.265/HEVC main @ Level 3.1
               720x576p 16:15 25.000fps (25/1fps)
               avwriter: hevc => mp4
Encoder Preset quality
Rate Control   VBR
Multipass      2pass-full
Bitrate        2500 kbps (Max: 9600 kbps)
Target Quality auto
QP range       I:0-51  P:0-51  B:0-51
QP Offset      cb:0  cr:0
VBV buf size   auto
Split Enc Mode auto
Lookahead      on, 16 frames, Level 0, Adaptive I, B Insert
GOP length     250 frames
B frames       3 frames [ref mode: each]
Ref frames     3 frames, MultiRef L0:auto L1:auto
AQ             off
CU max / min   auto / auto
Others         mv:Q-pel

encoded 25494 frames, 483.30 fps, 2545.33 kbps, 309.42 MB
encode time 0:00:52, CPU: 7.8%, GPU: 16.5%, VE: 96.7%, VD: 24.7%, GPUClock: 1914MHz, VEClock: 1779MHz
frame type IDR   275
frame type I     275,  avgQP  20.69,  total size    6.28 MB
frame type P   11025,  avgQP  19.52,  total size  176.21 MB
frame type B   14194,  avgQP  22.78,  total size  126.93 MB

3. The effect of both：

4. Test-7.82-avsw

NVEncC64.exe --avsw -i "E:\Download\Aria2Down\Test.VOB" --video-metadata clear --metadata clear -c hevc --vbr 2500 --bframes 3 --ref 3 --bref-mode each --preset quality --tier main --lookahead 16 --no-aq --level 3.1 --multipass 2pass-full --mv-precision Q-pel --avsync cfr --interlace tff --vpp-yadif -o "E:\Output\Test-7.82-avsw.mp4"
--------------------------------------------------------------------------------
E:\Output\Test-7.82-avsw.mp4
--------------------------------------------------------------------------------
NVEncC (x64) 7.82 (r3146) by rigaya, Jan 19 2025 09:39:23 (VC 1929/Win)
OS Version     Windows 10 x64 (19044) [UTF-8]
CPU            AMD Ryzen 5 5600 6-Core Processor [4.38GHz] (6C/12T)
GPU            #0: NVIDIA GeForce GTX 1660 (1408 cores, 1785 MHz)[PCIe3x16][572.61]
NVENC / CUDA   NVENC API 12.2, CUDA 12.8, schedule mode: auto
Input Buffers  CUDA, 32 frames
Input Info     avsw: mpeg2video(yv12)->nv12 [AVX2], 720x576, 25/1 fps
Vpp Filters    copyHtoD
               cspconv(nv12 -> yv12)
               yadif: mode auto
               cspconv(yv12 -> nv12)
Output Info    H.265/HEVC main @ Level 3.1
               720x576p 16:15 25.000fps (25/1fps)
               avwriter: hevc => mp4
Encoder Preset quality
Rate Control   VBR
Multipass      2pass-full
Bitrate        2500 kbps (Max: 9600 kbps)
Target Quality auto
QP range       I:0-51  P:0-51  B:0-51
QP Offset      cb:0  cr:0
VBV buf size   auto
Split Enc Mode auto
Lookahead      on, 16 frames, Level 0, Adaptive I, B Insert
GOP length     250 frames
B frames       3 frames [ref mode: each]
Ref frames     3 frames, MultiRef L0:auto L1:auto
AQ             off
CU max / min   auto / auto
Others         mv:Q-pel
[mpeg2video @ 00000000101b0300] ac-tex damaged at 39 150:03, GPU 16%, VE 99%, est out size 327.5MB
[mpeg2video @ 00000000101b0300] Warning MVs not available

encoded 25494 frames, 491.52 fps, 2545.50 kbps, 309.44 MB
encode time 0:00:51, CPU: 7.2%, GPU: 13.7%, VE: 97.1%, GPUClock: 1914MHz, VEClock: 1779MHz
frame type IDR   274
frame type I     274,  avgQP  20.70,  total size    6.28 MB
frame type P   10985,  avgQP  19.54,  total size  175.86 MB
frame type B   14235,  avgQP  22.75,  total size  127.30 MB

5. Test-7.82-avhw

NVEncC64.exe --avhw -i "E:\Download\Aria2Down\Test.VOB" --video-metadata clear --metadata clear -c hevc --vbr 2500 --bframes 3 --ref 3 --bref-mode each --preset quality --tier main --lookahead 16 --no-aq --level 3.1 --multipass 2pass-full --mv-precision Q-pel --avsync cfr --interlace tff --vpp-yadif -o "E:\Output\Test-7.82-avhw.mp4"
--------------------------------------------------------------------------------
E:\Output\Test-7.82-avhw.mp4
--------------------------------------------------------------------------------
NVEncC (x64) 7.82 (r3146) by rigaya, Jan 19 2025 09:39:23 (VC 1929/Win)
OS Version     Windows 10 x64 (19044) [UTF-8]
CPU            AMD Ryzen 5 5600 6-Core Processor [4.38GHz] (6C/12T)
GPU            #0: NVIDIA GeForce GTX 1660 (1408 cores, 1785 MHz)[PCIe3x16][572.61]
NVENC / CUDA   NVENC API 12.2, CUDA 12.8, schedule mode: auto
Input Buffers  CUDA, 32 frames
Input Info     avcuvid: MPEG2, 720x576, 25/1 fps
Vpp Filters    cspconv(nv12 -> yv12)
               yadif: mode auto
               cspconv(yv12 -> nv12)
Output Info    H.265/HEVC main @ Level 3.1
               720x576p 16:15 25.000fps (25/1fps)
               avwriter: hevc => mp4
Encoder Preset quality
Rate Control   VBR
Multipass      2pass-full
Bitrate        2500 kbps (Max: 9600 kbps)
Target Quality auto
QP range       I:0-51  P:0-51  B:0-51
QP Offset      cb:0  cr:0
VBV buf size   auto
Split Enc Mode auto
Lookahead      on, 16 frames, Level 0, Adaptive I, B Insert
GOP length     250 frames
B frames       3 frames [ref mode: each]
Ref frames     3 frames, MultiRef L0:auto L1:auto
AQ             off
CU max / min   auto / auto
Others         mv:Q-pel

encoded 25494 frames, 489.00 fps, 2545.33 kbps, 309.42 MB
encode time 0:00:52, CPU: 7.0%, GPU: 15.7%, VE: 96.8%, VD: 24.8%, GPUClock: 1908MHz, VEClock: 1773MHz
frame type IDR   275
frame type I     275,  avgQP  20.69,  total size    6.28 MB
frame type P   11025,  avgQP  19.52,  total size  176.21 MB
frame type B   14194,  avgQP  22.78,  total size  126.93 MB

Finally, both '-- avsw' and '-- avhw' were successful in 7.82. I found that the difference from 8.04 is the NVENC API, I don't know if it's related to this. Thank you very much for your reply.

Deinterlacing seems to have no effect #688

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