Gstreamer nvidia

[Gofrane]

thank you everyone
I installed nvenc but when I tried it with ffmpeg 

 *ffmpeg -y -i input.mp4  -vcodec  nvenc -b:v 5M  -acodec copy OUTPUT.mp4*

 I got this error
*ffmpeg version N-79887-gca5ec2b Copyright (c) 2000-2016 the FFmpeg
developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
  configuration: --enable-nonfree --enable-nvenc --enable-nvresize
--extra-cflags=-I../cudautils --extra-ldflags=-L../cudautils --enable-gpl
--enable-libx264
  libavutil      55. 24.100 / 55. 24.100
  libavcodec     57. 40.100 / 57. 40.100
  libavformat    57. 36.100 / 57. 36.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 45.100 /  6. 45.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[h264 @ 0x26705a0] Increasing reorder buffer to 1
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'outputfile.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2008-05-27 18:32:32
    encoder         : Lavf54.20.4
  Duration: 00:09:56.48, start: 0.000000, bitrate: 3343 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv,
bt709), 854x480, 2899 kb/s, 24 fps, 24 tbr, 2400 tbn (default)
    Metadata:
      creation_time   : 2008-05-27 18:32:32
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1,
fltp, 437 kb/s (default)
    Metadata:
      creation_time   : 2008-05-27 18:32:32
      handler_name    : SoundHandler
[nvenc @ 0x2721540] No NVENC capable devices found
Output #0, mp4, to 'OUTPUT.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf54.20.4
    Stream #0:0(eng): Unknown: none (default)
    Metadata:
      creation_time   : 2008-05-27 18:32:32
      handler_name    : VideoHandler
      encoder         : Lavc57.40.100 nvenc
    Stream #0:1(eng): Unknown: none (default)
    Metadata:
      creation_time   : 2008-05-27 18:32:32
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (nvenc))
  Stream #0:1 -> #0:1 (copy)
Error while opening encoder for output stream #0:0 - maybe incorrect
parameters such as bit_rate, rate, width or height*



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