ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 6.2.1 (GCC) 20160830
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf --enable-shared --enable-version3 --enable-x11grab
  libavutil      55. 34.100 / 55. 34.100
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.100 / 57. 56.100
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, alsa, from 'hw:0':
  Duration: N/A, start: 1485387631.044278, bitrate: 1411 kb/s
    Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
[video4linux2,v4l2 @ 0x564817a22f40] Detected monotonic timestamps, converting
Input #1, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 1485387631.279424, bitrate: 147456 kb/s
    Stream #1:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
No pixel format specified, yuv422p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x564817a268e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x564817a268e0] profile High 4:2:2, level 3.0, 4:2:2 8-bit
[libx264 @ 0x564817a268e0] 264 - core 148 r2708 86b7198 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 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=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, matroska, to 'output.mkv':
  Metadata:
    encoder         : Lavf57.56.100
    Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv422p, 640x480, q=-1--1, 30 fps, 1k tbn, 30 tbc
    Metadata:
      encoder         : Lavc57.64.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: vorbis (libvorbis) (oV[0][0] / 0x566F), 44100 Hz, stereo, fltp
    Metadata:
      encoder         : Lavc57.64.101 libvorbis
Stream mapping:
  Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (pcm_s16le (native) -> vorbis (libvorbis))
Press [q] to stop, [?] for help
frame=   13 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
frame=   22 fps= 22 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
frame=   31 fps= 20 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
frame=   39 fps= 19 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
frame=   48 fps= 19 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
frame=   56 fps= 18 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
frame=   65 fps= 18 q=27.0 size=       5kB time=00:00:02.30 bitrate=  17.0kbits/s speed=0.649x
frame=   73 fps= 18 q=27.0 size=       5kB time=00:00:02.68 bitrate=  14.6kbits/s speed=0.662x
frame=   81 fps= 18 q=29.0 size=       5kB time=00:00:03.14 bitrate=  12.5kbits/s speed=0.69x
frame=   90 fps= 18 q=27.0 size=       5kB time=00:00:03.66 bitrate=  10.7kbits/s speed=0.725x
frame=   98 fps= 18 q=27.0 size=       5kB time=00:00:04.14 bitrate=   9.5kbits/s speed=0.744x
frame=   98 fps= 15 q=-1.0 Lsize=    1040kB time=00:00:07.50 bitrate=1135.8kbits/s speed=1.18x
video:979kB audio:54kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 0.660106%
[libx264 @ 0x564817a268e0] frame I:1     Avg QP:12.83  size: 50554
[libx264 @ 0x564817a268e0] frame P:25    Avg QP:23.97  size: 17193
[libx264 @ 0x564817a268e0] frame B:72    Avg QP:25.44  size:  7241
[libx264 @ 0x564817a268e0] consecutive B-frames:  1.0%  0.0%  9.2% 89.8%
[libx264 @ 0x564817a268e0] mb I  I16..4: 13.9% 64.8% 21.2%
[libx264 @ 0x564817a268e0] mb P  I16..4:  3.9%  4.5%  0.8%  P16..4: 46.5% 23.2% 19.4%  0.0%  0.0%    skip: 1.7%
[libx264 @ 0x564817a268e0] mb B  I16..4:  1.2%  0.6%  0.0%  B16..8: 33.0%  2.2%  0.4%  direct:31.9%  skip:30.7%  L0:43.3% L1:43.1% BI:13.7%
[libx264 @ 0x564817a268e0] 8x8 transform intra:47.6% inter:70.9%
[libx264 @ 0x564817a268e0] coded y,uvDC,uvAC intra: 41.5% 94.5% 88.2% inter: 21.6% 74.0% 54.7%
[libx264 @ 0x564817a268e0] i16 v,h,dc,p: 18% 14%  5% 63%
[libx264 @ 0x564817a268e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 14% 26%  6%  7%  6%  5%  6%  6%
[libx264 @ 0x564817a268e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 18% 15%  6%  7%  6%  7%  5%  4%
[libx264 @ 0x564817a268e0] i8c dc,h,v,p: 66%  9% 13% 12%
[libx264 @ 0x564817a268e0] Weighted P-Frames: Y:24.0% UV:16.0%
[libx264 @ 0x564817a268e0] ref P L0: 40.1%  7.7% 36.7% 15.4%  0.1%
[libx264 @ 0x564817a268e0] ref B L0: 62.2% 30.1%  7.7%
[libx264 @ 0x564817a268e0] ref B L1: 87.4% 12.6%
[libx264 @ 0x564817a268e0] kb/s:1196.09