NVEnc Preview

[Dan64]

Willing to understand what is necessary to do, I think that we need to obtain with NVEnc a video with "uncompressed" frames.
This the first issue, because with NVEnc, i obtain the following output

NVEncC64.exe --avhw --input E:\VideoTest\TestSubs\TestSubs-1.mp4 --lossless --output-format raw --output E:\VideoTest\TestSubs\Test.raw                    --------------------------------------------------------------------------------
E:\VideoTest\TestSubs\Test.raw
--------------------------------------------------------------------------------
NVEncC (x64) 7.31 (r2580) by rigaya, Aug 28 2023 13:07:12 (VC 1929/Win)
OS Version     Windows 10 x64 (19045) [UTF-8]
CPU            Intel Core i9-10900 @ 2.80GHz [TB: 4.82GHz] (10C/20T)
GPU            #0: NVIDIA GeForce RTX 3060 (3584 cores, 1837 MHz)[PCIe3x16][537.13]
NVENC / CUDA   NVENC API 12.1, CUDA 12.2, schedule mode: auto
Input Buffers  CUDA, 20 frames
Input Info     avcuvid: H.264/AVC, 720x300, 25/1 fps
AVSync         vfr
Vpp Filters    copyDtoD
Output Info    H.264/AVC Unknown @ Level auto
               720x300p 1:1 25.000fps (25/1fps)
Encoder Preset default
Rate Control   CQP  I:0  P:0  B:0 (lossless)
ChromaQPOffset cb:0  cr:0
Split Enc Mode auto
Lookahead      off
GOP length     250 frames
B frames       3 frames [ref mode: disabled]
Ref frames     3 frames, MultiRef L0:auto L1:auto
AQ             off
Others         mv:auto cabac deblock adapt-transform:auto bdirect:auto

encoded 3050 frames, 1034.95 fps, 9176.35 kbps, 133.46 MB
encode time 0:00:02, CPU: 3.1%, GPU: 15.0%, VE: 49.7%, VD: 27.0%, GPUClock: 1890MHz, VEClock: 1665MHz
frame type IDR   13
frame type I     13,  total size   1.01 MB
frame type P    769,  total size  40.79 MB
frame type B   2268,  total size  91.65 MB

The frames are compressed " H.264/AVC Unknown @ Level auto ", this fact is confirmed by Mediainfo

Video
ID                          : 1
Format                      : AVC
Format/Info                 : Advanced Video Codec
Format profile              : High 4:4:4 Predictive@L3
Format settings             : CABAC / 3 Ref Frames
Format settings, CABAC      : Yes
Format settings, Reference  : 3 frames
Codec ID                    : V_MPEG4/ISO/AVC
Duration                    : 2 min 2 s
Bit rate                    : 9 176 kb/s
Width                       : 720 pixels
Height                      : 300 pixels
Display aspect ratio        : 2.40:1
Frame rate mode             : Constant
Frame rate                  : 25.000 FPS
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : Progressive
Bits/(Pixel*Frame)          : 1.699
Stream size                 : 133 MiB (100%)
Default                     : Yes
Forced                      : No

This is the first issue. I tried to fix the problem by using ffmpeg that is able to provide in output "true" raw video, but I think that the second pipe is "frozing" the process because I'm unable to forward the frames, while this is possible by using only ffmpeg, even if in this case the colors are wrong.

So the question is, it is possible to use NVEnc to produce in output "true" uncompressed frames ?

---

While using "ffmpeg" in pipe I obtaing the following output

NVEncC64.exe --avhw --input E:\VideoTest\TestSubs\TestSubs-1.mp4 --lossless --output-format raw --output -| ffmpeg.exe -i - -vcodec rawvideo -pix_fmt yuv420p -loglevel debug -f rawvideo E:\VideoTest\TestSubs\Test2.raw
--------------------------------------------------------------------------------
-
--------------------------------------------------------------------------------
NVEncC (x64) 7.31 (r2580) by rigaya, Aug 28 2023 13:07:12 (VC 1929/Win)
OS Version     Windows 10 x64 (19045) [UTF-8]
CPU            Intel Core i9-10900 @ 2.80GHz [TB: 4.70GHz] (10C/20T)
GPU            #0: NVIDIA GeForce RTX 3060 (3584 cores, 1837 MHz)[PCIe3x16][537.13]
NVENC / CUDA   NVENC API 12.1, CUDA 12.2, schedule mode: auto
Input Buffers  CUDA, 20 frames
Input Info     avcuvid: H.264/AVC, 720x300, 25/1 fps
AVSync         vfr
Vpp Filters    copyDtoD
Output Info    H.264/AVC Unknown @ Level auto
               720x300p 1:1 25.000fps (25/1fps)
Encoder Preset default
Rate Control   CQP  I:0  P:0  B:0 (lossless)
ChromaQPOffset cb:0  cr:0
Split Enc Mode auto
Lookahead      off
GOP length     250 frames
B frames       3 frames [ref mode: disabled]
Ref frames     3 frames, MultiRef L0:auto L1:auto
AQ             off
Others         mv:auto cabac deblock adapt-transform:auto bdirect:auto

encoded 3050 frames, 767.88 fps, 9176.35 kbps, 133.46 MB
encode time 0:00:03, CPU: 1.4%, GPU: 8.6%, VE: 34.2%, VD: 20.6%, GPUClock: 1837MHz, VEClock: 1612MHz
frame type IDR   13
frame type I     13,  total size   1.01 MB
frame type P    769,  total size  40.79 MB
frame type B   2268,  total size  91.65 MB
ffmpeg version N-100400-g5f7dc836ce-gd76469378d+4 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
  configuration:  --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --disable-debug --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libmfx --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libaom --enable-libopenmpt --enable-version3 --enable-libsvthevc --enable-libsvtav1 --enable-libkvazaar --enable-libzmq --enable-libvmaf --enable-vapoursynth --disable-libdavs2 --enable-librav1e --enable-mbedtls --extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++ --extra-cflags=-DZMQ_STATIC --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads --extra-cflags=-DKVZ_STATIC_LIB
  libavutil      56. 62.100 / 56. 62.100
  libavcodec     58.115.102 / 58.115.102
  libavformat    58. 65.100 / 58. 65.100
  libavdevice    58. 11.103 / 58. 11.103
  libavfilter     7. 93.100 /  7. 93.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Splitting the commandline.
Reading option '-i' ... matched as input url with argument '-'.
Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'rawvideo'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv420p'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'rawvideo'.
Reading option 'E:\VideoTest\TestSubs\Test2.raw' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url -.
Successfully parsed a group of options.
Opening an input file: -.
[NULL @ 0000023ee2258500] Opening 'pipe:' for reading
[pipe @ 0000023ee2259600] Setting default whitelist 'crypto,data'
[AVIOContext @ 0000023ee2259800] Statistics: 1048576 bytes read, 0 seeks
pipe:: Invalid data found when processing input

So it seems that the pipe process is broken, and this could explain the frozen process.