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 ?

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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.