ffmpeg 10-bit

env PULSE_LATENCY_MSEC=2 ffmpeg -vsync passthrough -thread_queue_size 4096 -framerate 30 -f x11grab -s 1366x768 -i :0.0 -acodec libfdk_aac -b:a 160k -cutoff:a 20000 -vcodec libx264 -preset:v superfast -profile:v high10 -pix_fmt yuv420p10le -f flv TEST000.flv
ffmpeg version N-86701-gd32a6c3 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (Ubuntu 6.3.0-12ubuntu2) 20170406
  configuration: --enable-shared --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv --enable-libfdk-aac --enable-vaapi --enable-nonfree --enable-gpl --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-libxcb-shape --enable-ffplay
  libavutil      55. 67.100 / 55. 67.100
  libavcodec     57.100.103 / 57.100.103
  libavformat    57. 75.100 / 57. 75.100
  libavdevice    57.  7.100 / 57.  7.100
  libavfilter     6. 94.100 /  6. 94.100
  libavresample   3.  6.  0 /  3.  6.  0
  libswscale      4.  7.101 /  4.  7.101
  libswresample   2.  8.100 /  2.  8.100
  libpostproc    54.  6.100 / 54.  6.100
[x11grab @ 0x55da37f8b860] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1499567385.469926, bitrate: N/A
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1366x768, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
Codec AVOption cutoff (set cutoff bandwidth) specified for output file #0 (TEST000.flv) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (TEST000.flv) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
Incompatible pixel format 'yuv420p10le' for codec 'libx264', auto-selecting format 'yuv420p'
[libx264 @ 0x55da37f94e20] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x55da37f94e20] profile High, level 3.2
[libx264 @ 0x55da37f94e20] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x3 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 pb_ratio=1.30 aq=1:1.00
Output #0, flv, to 'TEST000.flv':
  Metadata:
    encoder         : Lavf57.75.100
    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1366x768, q=-1--1, 30 fps, 1k tbn, 30 tbc
    Metadata:
      encoder         : Lavc57.100.103 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
[swscaler @ 0x55da37f9a4a0] Warning: data is not aligned! This can lead to a speedloss
[libx264 @ 0x55da37f94e20] non-strictly-monotonic PTS
frame=  271 fps= 30 q=-1.0 Lsize=     739kB time=00:00:08.93 bitrate= 677.5kbits/s speed=0.995x
video:733kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.760956%
[libx264 @ 0x55da37f94e20] frame I:2     Avg QP: 9.66  size:154780
[libx264 @ 0x55da37f94e20] frame P:68    Avg QP:16.26  size:  4570
[libx264 @ 0x55da37f94e20] frame B:201   Avg QP:21.33  size:   646
[libx264 @ 0x55da37f94e20] consecutive B-frames:  1.1%  0.0%  0.0% 98.9%
[libx264 @ 0x55da37f94e20] mb I  I16..4: 67.1%  0.9% 32.0%
[libx264 @ 0x55da37f94e20] mb P  I16..4:  0.6%  0.0%  0.3%  P16..4:  5.7%  0.0%  0.0%  0.0%  0.0%    skip:93.4%
[libx264 @ 0x55da37f94e20] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.4%  0.0%  0.0%  direct: 0.3%  skip:99.2%  L0:38.6% L1:55.9% BI: 5.5%
[libx264 @ 0x55da37f94e20] 8x8 transform intra:1.7% inter:12.0%
[libx264 @ 0x55da37f94e20] coded y,uvDC,uvAC intra: 34.2% 42.1% 40.6% inter: 0.8% 1.0% 0.6%
[libx264 @ 0x55da37f94e20] i16 v,h,dc,p: 87% 13%  1%  0%
[libx264 @ 0x55da37f94e20] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 19% 30%  4%  5%  5%  5%  2%  8%
[libx264 @ 0x55da37f94e20] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 34% 31% 10%  3%  4%  4%  4%  3%  7%
[libx264 @ 0x55da37f94e20] i8c dc,h,v,p: 65% 20% 13%  2%
[libx264 @ 0x55da37f94e20] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x55da37f94e20] kb/s:664.40