[FFmpeg-user] [FFmpeg-devel] h264_nvenc encoding issue

[Andrey Turkin]

Hi,

Can you check if adding

-vf format=nv12

 makes any difference?

2016-10-14 15:47 GMT+03:00 tyt xtreme <alseczg at gmail.com>:

> 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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