encode recordings with quicksync/vaapi ffmpeg on Ubuntu 16.04 server

Hello,

I am recording my Live tv (DVB S2 with tvheadend) on my storage as mkv files with no transcoding on an N3150 Box. But I have not unlimited storage and want to reduce the filesize. Reencoding the files on CPU is way to slow on the N3150, therefore I want to use Quicksync/VAAPI since the hardware should be able to do it.
I am running a pure Ubuntu 16.04.1 server system (no X Server), which is my storage server.

I download a precompiled ffmpeg from http://johnvansickle.com/ffmpeg/ with vaapi/qsv support, but I cant get i working and I dont know why

Code:
./ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -i /Aufnahmen/Transcendence.mkv -an -c:v h264_vaapi /Aufnahmen/Transcendence.mp4
ffmpeg version N-82997-g557c0df9a8-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.1 (Debian 5.4.1-4) 20161202
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  libavutil      55. 43.100 / 55. 43.100
  libavcodec     57. 70.101 / 57. 70.101
  libavformat    57. 61.100 / 57. 61.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 68.100 /  6. 68.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
[AVHWDeviceContext @ 0x402f080] No VA display found for device: /dev/dri/renderD128.
[vaapi @ 0x30e41e0] Failed to create a VAAPI device

root@serverhost:~/ffmpeg-git-20170104-64bit-static# ./ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -i /Aufnahmen/Transcendence.mkv -vf 'format=nv12,hwupload' -acodec copy -vcodec h264_vaapi -qp 19 /Aufnahmen/Transcendence.mp4
ffmpeg version N-82997-g557c0df9a8-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.1 (Debian 5.4.1-4) 20161202
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  libavutil      55. 43.100 / 55. 43.100
  libavcodec     57. 70.101 / 57. 70.101
  libavformat    57. 61.100 / 57. 61.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 68.100 /  6. 68.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
[AVHWDeviceContext @ 0x46880c0] No VA display found for device: /dev/dri/renderD128.
[vaapi @ 0x30e41e0] Failed to create a VAAPI device

root@serverhost:~/ffmpeg-git-20170104-64bit-static# ./ffmpeg -vaapi_device /dev/dri/renderD128 -i /Aufnahmen/Transcendence.mkv -vf 'format=nv12,hwupload' -c:v h264_vaapi /Aufnahmen/Transcendence.mp4
ffmpeg version N-82997-g557c0df9a8-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.1 (Debian 5.4.1-4) 20161202
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  libavutil      55. 43.100 / 55. 43.100
  libavcodec     57. 70.101 / 57. 70.101
  libavformat    57. 61.100 / 57. 61.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 68.100 /  6. 68.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
[AVHWDeviceContext @ 0x52f0040] No VA display found for device: /dev/dri/renderD128.
[vaapi @ 0x30e41e0] Failed to create a VAAPI device

root@serverhost:/dev/dri# ls /dev/dri/
card0  controlD64  renderD128

If I get it working in the commandline I would like to use a script to run a postprocessing process in Tvheadend.