[FFmpeg-trac] #6276(ffmpeg:new): h264_vaapi & nvenc do not preserve aspect ratio changes

[FFmpeg]

#6276: h264_vaapi & nvenc do not preserve aspect ratio changes
-------------------------------------+-------------------------------------
             Reporter:  Tom_B        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
             Keywords:  vaapi nvenc  |  master
  aspect ratio                       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 ffmpeg output:

 ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
   built with gcc 6.3.1 (GCC) 20170109
   configuration: --prefix=/usr --disable-debug --disable-static --disable-
 stripping --enable-avisynth --enable-avresample --enable-fontconfig
 --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass
 --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-
 libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame
 --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg
 --enable-libopus --enable-libpulse --enable-libschroedinger --enable-
 libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-
 libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-
 libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf
 --enable-shared --enable-version3 --enable-x11grab
   libavutil      55. 34.101 / 55. 34.101
   libavcodec     57. 64.101 / 57. 64.101
   libavformat    57. 56.101 / 57. 56.101
   libavdevice    57.  1.100 / 57.  1.100
   libavfilter     6. 65.100 /  6. 65.100
   libavresample   3.  1.  0 /  3.  1.  0
   libswscale      4.  2.100 /  4.  2.100
   libswresample   2.  3.100 /  2.  3.100
   libpostproc    54.  1.100 / 54.  1.100






 Command:

  ffmpeg  -vaapi_device /dev/dri/renderD128 -hwaccel vaapi  -i input.ts -y
 -g 30 -vf 'format=nv12,hwupload'  -c:v h264_vaapi -qp 20 -sn out.ts


 The input file is available at https://r.je/tmp/input.ts (apologies this
 is a 900mb file) with a change in aspect ratio from 16:9 to 4:3 at 3:28


 When using h264_vaapi as the codec, it doens't maintain the aspect ratio
 change, however the aspect ratio change is maintained if using libx264



 Using libx264, the aspect change is copied into the output file.


 Note: The same bug happens when using h264_nvenc.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6276>
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