gcc 5.3.0
--enable-nvenc nvidia_video_sdk_6.0.1
--enable-libmfx Intel(R)_Media_SDK_2016.0.1
--enable-libfdk-aac 0.1.4
--enable-libspeex 1.2rc1
--enable-libx264 1:148.20150725
--enable-libopenh264 1.5.0
--enable-libx265 1.8
--enable-libopus 1.1.2
--enable-libmp3lame 3.99.5
--enable-libkvazaar 0.8.2

./configure –prefix=/home/aliang/FFmpeg/x86_64 –enable-small –disable-debug –disable-doc –arch=x86_64 –cc=’ccache x86_64-w64-mingw32-gcc’ –cross-prefix=x86_64-w64-mingw32- –enable-cross-compile –target-os=mingw32 –enable-libfdk-aac –enable-libmp3lame –enable-libopus –enable-libspeex –enable-libx264 –enable-libx265 –enable-libmfx –enable-nvenc –enable-libopenh264 –enable-libkvazaar –enable-gpl –enable-nonfree

我在MacBook Pro上运行Windows.我也尝试过更新的版本并具有相同的输出.

输入视频来自sample-videos.com.

我正在运行的ffmpeg命令是：

ffmpeg -y -i sample.mp4 -vcodec nvenc_h264 -pixel_format yuv420p -f mp4 sample-out-nvenc.mp4

sample-out-nvenc.mp4通过ffplay或vlc看起来像这样：

当我使用jpeg2抓取一个框架时,颜色显得正常,但高度被压扁.

ffmpeg -y -ss 15.5 -i sample.mp4 -vframes 1 -s 480x300 -f image2 grab.jpg

输出的ffprobe结果(sample-out-nvenc.mp4)：

Input #0,mov,mp4,m4a,3gp,3g2,mj2,from 'sample-out-nvenc.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.25.100
  Duration: 00:00:31.02,start: 0.021333,bitrate: 1994 kb/s
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661),yuv420p(tv),640x480 [SAR 1:1 DAR 4:3],1650 kb/s,25 fps,25 tbr,12800 tbn,50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D),48000 Hz,5.1,fltp,342 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

最后是nvenc编码命令的输出：

ffmpeg -y -i sample.mp4 -vcodec nvenc_h264 -pixel_format yuv420p -f mp4 sample-out-nvenc.mp4
ffmpeg version 3.0 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --prefix=/home/aliang/FFmpeg/x86_64 --enable-small --disable-debug --disable-doc --arch=x86_64 --cc='ccache x86_64-w64-mingw32-gcc' --cross-prefix=x86_64-w64-mingw32- --enable-cross-compile --target-os=mingw32 --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libspeex --enable-libx264 --enable-libx265 --enable-libmfx --enable-nvenc --enable-libopenh264 --enable-libkvazaar --enable-gpl --enable-nonfree
  libavutil      55. 17.103 / 55. 17.103
  libavcodec     57. 24.102 / 57. 24.102
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 31.100 /  6. 31.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0,from 'sample.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 1970-01-01 00:00:00
    encoder         : Lavf53.24.2
  Duration: 00:00:31.00,start: 0.000000,bitrate: 1353 kb/s
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661),yuv420p,966 kb/s,50 tbc (default)
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D),383 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : SoundHandler
Output #0,to 'sample-out-nvenc.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.25.100
    Stream #0:0(und): Video: h264 (nvenc_h264) ([33][0][0][0] / 0x0021),q=-1--1,2000 kb/s,25 tbc (default)
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : VideoHandler
      encoder         : Lavc57.24.102 nvenc_h264
    Side data:
      unknown side data type 10 (24 bytes)
    Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040),341 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : SoundHandler
      encoder         : Lavc57.24.102 aac
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (nvenc_h264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop,[?] for help
frame=  774 fps=253 q=-0.0 Lsize=    7551kB time=00:00:30.99 bitrate=1995.6kbits/s speed=10.1x
video:6236kB audio:1297kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.243011%
[aac @ 000001cdd9900520] Qavg: 743.457