[FFmpeg-devel] h264_nvenc encoding issue

[tyt xtreme]

Hi,

I already post my mail to ffmpeg-users group regarding this issue but no
one could help me out and advised to ask more experienced users. So i hope
you can tell me something and sorry posting here.

Here is my re-encoding command's output (Windows 8.1 with Bash):
*$ ffmpeg -i perspective.mp4 -c:v h264_nvenc -profile:v high -preset:v fast
perspective_out.mp4*

ffmpeg version N-81960-g1bda0ee Copyright (c) 2000-2016 the FFmpeg
developers
  built with gcc 5.4.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth
--enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-iconv --enable-libass --enable-libbluray
--enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme
--enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264
--enable-libopenjpeg --enable-libopus --enable-librtmp
--enable-libschroedinger --enable-libsnappy --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg
--enable-lzma --enable-decklink --enable-zlib
  libavutil      55. 32.100 / 55. 32.100
  libavcodec     57. 61.100 / 57. 61.100
  libavformat    57. 51.103 / 57. 51.103
  libavdevice    57.  0.102 / 57.  0.102
  libavfilter     6. 63.100 /  6. 63.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  2.100 /  2.  2.100
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'perspective.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.50.100
  Duration: 00:07:27.87, start: 2.132000, bitrate: 10235 kb/s
    Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 10233 kb/s,
24.94 fps, 29.97 tbr, 1000k tbn, 2000k tbc (default)
    Metadata:
      handler_name    : VideoHandler
File 'perspective_out.mp4' already exists. Overwrite ? [y/N] y
Output #0, mp4, to 'perspective_out.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.51.103
    Stream #0:0(eng): Video: h264 (h264_nvenc) (High) ([33][0][0][0] /
0x0021), yuv420p, 3840x2160 [SAR 1:1 DAR 16:9], q=-1--1, 2000 kb/s, 29.97
fps, 30k tbn, 29.97 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc57.61.100 h264_nvenc
    Side data:
      cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay:
-1
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_nvenc))
Press [q] to stop, [?] for help
Past duration 0.731316 too large    8815kB time=00:00:27.22
bitrate=2652.4kbits/s dup=206 drop=0 speed=3.95x


The output is far away from optimal. It's kind of green,red colored &
ghosty. Attached - resized - image samples about the original and output
frames. Any idea why encoder doing this? I'm using GeForce GTX 980 Ti 6Gb
GPU.

Thanks!
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