gistfile1.txt

$ ffmpeg -f v4l2 -i "/dev/video1" out.mp4
ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 5.5.0 (Homebrew gcc 5.5.0_4)
  configuration: --prefix=/home/linuxbrew/.linuxbrew/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=gcc-5 --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, video4linux2,v4l2, from '/dev/video1':
  Duration: N/A, start: 436033.656008, bitrate: 589824 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 589824 kb/s, 40 fps, 40 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x1a1ca00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x1a1ca00] profile High 4:2:2, level 3.2, 4:2:2 8-bit
[libx264 @ 0x1a1ca00] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=18 lookahead_threads=3 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, mp4, to 'out.mp4':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv422p, 1280x720, q=-1--1, 40 fps, 10240 tbn, 40 tbc
    Metadata:
      encoder         : Lavc58.35.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=   23 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrframe=   43 fps= 43 q=0.0 size=       0kB time=00:00:00.00 bitrframe=   63 fps= 42 q=30.0 size=       0kB time=-00:00:00.04 biframe=   83 fps= 41 q=30.0 size=     256kB time=00:00:00.45 bitframe=  103 fps= 41 q=30.0 size=     256kB time=00:00:00.95 bitframe=  123 fps= 41 q=30.0 size=     512kB time=00:00:01.45 bitframe=  144 fps= 41 q=30.0 size=     512kB time=00:00:01.97 bitframe=  164 fps= 41 q=30.0 size=     768kB time=00:00:02.47 bitframe=  184 fps= 41 q=30.0 size=     768kB time=00:00:02.97 bitframe=  192 fps= 39 q=-1.0 Lsize=    1150kB time=00:00:04.72 bitrate=1993.7kbits/s dup=0 drop=93 speed=0.967x    
video:1147kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.267970%
[libx264 @ 0x1a1ca00] frame I:1     Avg QP:19.80  size: 35992
[libx264 @ 0x1a1ca00] frame P:49    Avg QP:19.56  size: 21207
[libx264 @ 0x1a1ca00] frame B:142   Avg QP:27.83  size:   694
[libx264 @ 0x1a1ca00] consecutive B-frames:  0.5%  2.1%  1.6% 95.8%
[libx264 @ 0x1a1ca00] mb I  I16..4: 15.3% 54.0% 30.7%
[libx264 @ 0x1a1ca00] mb P  I16..4:  0.9%  1.7%  6.5%  P16..4:  4.2%  1.4%  1.2%  0.0%  0.0%    skip:84.1%
[libx264 @ 0x1a1ca00] mb B  I16..4:  0.1%  0.3%  0.2%  B16..8:  5.4%  0.1%  0.0%  direct: 0.0%  skip:93.9%  L0:45.6% L1:51.1% BI: 3.2%
[libx264 @ 0x1a1ca00] 8x8 transform intra:28.2% inter:23.8%
[libx264 @ 0x1a1ca00] coded y,uvDC,uvAC intra: 46.7% 58.8% 56.3% inter: 0.6% 0.8% 0.7%
[libx264 @ 0x1a1ca00] i16 v,h,dc,p: 41% 51%  7%  1%
[libx264 @ 0x1a1ca00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 17% 45%  1%  1%  1%  1%  1%  1%
[libx264 @ 0x1a1ca00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 39% 20% 16%  3%  4%  5%  4%  5%  3%
[libx264 @ 0x1a1ca00] i8c dc,h,v,p: 55% 15% 28%  2%
[libx264 @ 0x1a1ca00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x1a1ca00] ref P L0: 57.6% 10.3% 23.5%  8.6%
[libx264 @ 0x1a1ca00] ref B L0: 68.8% 25.7%  5.5%
[libx264 @ 0x1a1ca00] ref B L1: 90.2%  9.8%
[libx264 @ 0x1a1ca00] kb/s:1956.16
Exiting normally, received signal 2.