[FFmpeg-trac] #8957(avcodec:new): Regression in nvenc

FFmpeg trac at avcodec.org
Fri Oct 30 15:15:52 EET 2020 

#8957: Regression in nvenc
-------------------------------------+-------------------------------------
             Reporter:  Urbanite316  |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:  avcodec      |                  Version:  git-
             Keywords:  nvenc        |  master
  regression                         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 When using h264_nvenc or hevc_nvenc a slowdown of 50fps to 100fps was
 introduced with commit
 [https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/1bf86ee907709e37c0104908e56ec77d5d854c87
 avcodec/nvenc: removed unused and deprecated field]

 How to reproduce:
 Run a transcode on versions built before and after the stated commit,
 example below is what I specifically used.

 {{{
 ffmpeg.exe -loglevel error -stats -i <input.mkv> -map 0:0 -c:v hevc_nvenc
 -pix_fmt:v p010le -b:v 6000k -maxrate:v 18000k -preset:v p5 -rc:v vbr
 -color_primaries:v bt709 -color_trc:v bt709 -colorspace:v bt709
 -metadata:s:v title= -disposition:v default -map 0:1 -c:a:0 ac3 -b:a:0
 640k -metadata:s:a:0 title= -disposition:a:0 default -sn -metadata:g
 title= -default_mode passthrough <output.mkv>
 }}}


 Multiple users I associate with have confirmed this regression. It can
 also be seen in both the [https://www.gyan.dev/ffmpeg/builds/ gyan.dev]
 version and [https://github.com/BtbN/FFmpeg-Builds/releases BtbN] version.
 With the BtbN version the [https://github.com/BtbN/FFmpeg-
 Builds/releases/tag/autobuild-2020-10-21-12-32 Auto-Build 2020-10-21
 12:32] is prior to the regression the [https://github.com/BtbN/FFmpeg-
 Builds/releases/tag/autobuild-2020-10-28-12-36 Auto-Build 2020-10-28
 12:36] contains the regression.

 version output from working version built from commit
 [https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/cde3c080338154cc73103939f6ab26ae5bb718cd
 avcodec/nvenc: mark newly deprecated rc modes]
 {{{
 ffmpeg version N-99689-gcde3c08033-ffmpeg-windows-build-helpers Copyright
 (c) 2000-2020 the FFmpeg developers
 built with gcc 10.1.0 (GCC)
 configuration: --pkg-config=pkg-config --pkg-config-flags=--static
 --extra-version=ffmpeg-windows-build-helpers --enable-version3 --disable-
 debug --disable-w32threads --arch=x86_64 --target-os=mingw32 --cross-
 prefix=/home/<user>/ffmpeg-windows-build-
 helpers/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32-
 --enable-libcaca --enable-gray --enable-libtesseract --enable-fontconfig
 --enable-gmp --enable-gnutls --enable-libass --enable-libbluray --enable-
 libbs2b --enable-libflite --enable-libfreetype --enable-libfribidi
 --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug
 --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex
 --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-
 libvorbis --enable-libwebp --enable-libzimg --enable-libzvbi --enable-
 libmysofa --enable-libopenjpeg --enable-libopenh264 --enable-liblensfun
 --enable-libvmaf --enable-libsrt --enable-libaribb24 --enable-demuxer=dash
 --enable-libxml2 --enable-opengl --enable-libdav1d --enable-cuda-llvm
 --enable-libaom --enable-libvpx --enable-nvenc --enable-nvdec --extra-
 libs=-lharfbuzz --extra-libs=-lm --extra-libs=-lpthread --extra-
 cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-
 cflags=-DCACA_STATIC --enable-amf --enable-libmfx --enable-gpl --enable-
 frei0r --enable-filter=frei0r --enable-librubberband --enable-libvidstab
 --enable-libx264 --enable-libx265 --enable-libxvid --enable-libdavs2
 --enable-libxavs2 --enable-libxavs --enable-avresample --extra-
 cflags='-mtune=generic' --extra-cflags=-O3 --enable-static --disable-
 shared --prefix=/home/<user>/ffmpeg-windows-build-
 helpers/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32
 libavutil      56. 60.100 / 56. 60.100
 libavcodec     58.111.101 / 58.111.101
 libavformat    58. 62.100 / 58. 62.100
 libavdevice    58. 11.102 / 58. 11.102
 libavfilter     7. 88.100 /  7. 88.100
 libavresample   4.  0.  0 /  4.  0.  0
 libswscale      5.  8.100 /  5.  8.100
 libswresample   3.  8.100 /  3.  8.100
 libpostproc    55.  8.100 / 55.  8.100
 }}}

 version output from latest version built from commit
 [https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/bb6edf618a2a2effbe857e1249fda05782a7dbbc
 avcodec/nvenc: all presets are SDK10 presets now]
 {{{
 ffmpeg version N-99803-gbb6edf618a-ffmpeg-windows-build-helpers Copyright
 (c) 2000-2020 the FFmpeg developers
 built with gcc 10.1.0 (GCC)
 configuration: --pkg-config=pkg-config --pkg-config-flags=--static
 --extra-version=ffmpeg-windows-build-helpers --enable-version3 --disable-
 debug --disable-w32threads --arch=x86_64 --target-os=mingw32 --cross-
 prefix=/home/<user>/ffmpeg-windows-build-
 helpers/sandbox/cross_compilers/mingw-w64-x86_64/bin/x86_64-w64-mingw32-
 --enable-libcaca --enable-gray --enable-libtesseract --enable-fontconfig
 --enable-gmp --enable-gnutls --enable-libass --enable-libbluray --enable-
 libbs2b --enable-libflite --enable-libfreetype --enable-libfribidi
 --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug
 --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex
 --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-
 libvorbis --enable-libwebp --enable-libzimg --enable-libzvbi --enable-
 libmysofa --enable-libopenjpeg --enable-libopenh264 --enable-liblensfun
 --enable-libvmaf --enable-libsrt --enable-libaribb24 --enable-demuxer=dash
 --enable-libxml2 --enable-opengl --enable-libdav1d --enable-cuda-llvm
 --enable-libaom --enable-libvpx --enable-nvenc --enable-nvdec --extra-
 libs=-lharfbuzz --extra-libs=-lm --extra-libs=-lpthread --extra-
 cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-
 cflags=-DCACA_STATIC --enable-amf --enable-libmfx --enable-gpl --enable-
 frei0r --enable-filter=frei0r --enable-librubberband --enable-libvidstab
 --enable-libx264 --enable-libx265 --enable-libxvid --enable-libdavs2
 --enable-libxavs2 --enable-libxavs --enable-avresample --extra-
 cflags='-mtune=generic' --extra-cflags=-O3 --enable-static --disable-
 shared --prefix=/home/<user>/ffmpeg-windows-build-
 helpers/sandbox/cross_compilers/mingw-w64-x86_64/x86_64-w64-mingw32
 libavutil      56. 60.100 / 56. 60.100
 libavcodec     58.112.100 / 58.112.100
 libavformat    58. 64.100 / 58. 64.100
 libavdevice    58. 11.102 / 58. 11.102
 libavfilter     7. 88.100 /  7. 88.100
 libavresample   4.  0.  0 /  4.  0.  0
 libswscale      5.  8.100 /  5.  8.100
 libswresample   3.  8.100 /  3.  8.100
 libpostproc    55.  8.100 / 55.  8.100
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8957>
FFmpeg <https://ffmpeg.org>
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