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
[mjpeg @ 0x2765940] No JPEG data found in image
    Last message repeated 1 times
Input #0, video4linux2,v4l2, from '/dev/video1':
  Duration: N/A, start: 32628.491254, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080, 60 fps, 60 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[mjpeg @ 0x276dc80] No JPEG data found in image
Error while decoding stream #0:0: Invalid data found when processing input
[mjpeg @ 0x276dc80] No JPEG data found in image
Error while decoding stream #0:0: Invalid data found when processing input
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=107
[libx264 @ 0x2769d40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x2769d40] profile High 4:2:2, level 4.2, 4:2:2 8-bit
[libx264 @ 0x2769d40] 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), yuvj422p(pc), 1920x1080, q=-1--1, 60 fps, 15360 tbn, 60 tbc
    Metadata:
      encoder         : Lavc58.35.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=103
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=104
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=105
[mjpeg @ 0x276dc80] error count: 64
[mjpeg @ 0x276dc80] error y=33 x=8
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=89
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=101
[mjpeg @ 0x276dc80] error count: 69
[mjpeg @ 0x276dc80] error y=120 x=38
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=113
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=110
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=91
frame=   91 fps= 60 q=31.0 size=     768kB time=00:00:00.45 bitrate=13979.8kbits/s speed=0.298x[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=99
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=119 x=118
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=99
frame=  121 fps= 60 q=31.0 size=    1024kB time=00:00:00.95 bitrate=8829.9kbits/s speed=0.472x [mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=117
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=98
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=110
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=111
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=83
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=113
frame=  152 fps= 60 q=31.0 size=    1024kB time=00:00:01.46 bitrate=5719.5kbits/s speed=0.583x [mjpeg @ 0x276dc80] error count: 64
[mjpeg @ 0x276dc80] error y=33 x=26
[mjpeg @ 0x276dc80] error count: 64
[mjpeg @ 0x276dc80] error y=33 x=26
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=99
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=103
[mjpeg @ 0x276dc80] mjpeg_decode_dc: bad vlc: 0:0 (0x2768d88)
[mjpeg @ 0x276dc80] error dc
[mjpeg @ 0x276dc80] error y=134 x=109
[mjpeg @ 0x276dc80] overread 8
^C