./ffmpeg -i ../../23.MTS -c:v h264_nvenc -preset default ../../out.avi
ffmpeg version N-83276-g2ae8278 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.9.2 (Debian 4.9.2-10)
  configuration: --enable-nonfree --enable-nvenc --extra-ldflags=-L../cudautils --enable-gpl --enable-libx264 --extra-ldflags=-L/var/tmp/gurki/ff/x264 --extra-ldflags=-L/var/tmp/gurki/ff/VC
  libavutil      55. 45.100 / 55. 45.100
  libavcodec     57. 75.100 / 57. 75.100
  libavformat    57. 65.100 / 57. 65.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 71.100 /  6. 71.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, mpegts, from '../../23.MTS':
  Duration: 00:34:10.06, start: 85.557644, bitrate: 65454 kb/s
  Program 1
    Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 100 tbc
    Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 256 kb/s
    Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080
File '../../out.avi' already exists. Overwrite ? [y/N] y
Cannot load libnvidia-encode.so.1
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (ac3 (native) -> ac3 (native))
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height