title: recording from webcam using ffmpeg at high framerate
body: <p>I have a webcam (model Brio 4K stream edition from Logitech) that is able to record at resolution 1280x720 and 60 fps in guvcview on Ubuntu 16.04. I then use a video codec 'raw camera input'. This is working fine and as expected, and the result is well a 60 fps video at the desired resolution.</p>
  
  <p>However, I need to record using command line and not GUI. The guvcview GUI crashes on my machine (segmentation fault, this has been reported by other users before), so I want to use ffmpeg instead.</p>
  
  <p>Unfortunately, when I use the command (in terminal):</p>
  
  <pre><code>ffmpeg -i /dev/video1 -framerate 60 -video_size 1280x720 out.mkv
  </code></pre>
  
  <p>I only get around 30 fps out. This is of course not due to the camera by itself (it works at 60 fps in guvcview), but I cannot understand why I get 30 fps when I ask for 60 fps explicitely. It also looks in the output of ffmpeg as it records at 30 fps:</p>
  
  <pre><code>Metadata:
      encoder         : Lavf56.40.101
      Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv422p, 1280x720, q=-1--1, 30 fps, 1k tbn, 30 tbc
  </code></pre>
  
  <p>Any suggestion how I can solve this and record at 60 fps using ffmpeg?</p>
  
  <p><strong>Note</strong>: I also tried something like this, with the same result (only 30 fps):</p>
  
  <pre><code>ffmpeg -f video4linux2 -i /dev/video1 -framerate 60.0 -video_size 1280x720 out.mkv
  </code></pre>
  
  <p><strong>Edit 1</strong> thank you for the help in comment: order of arguments matters. Now using:</p>
  
  <pre><code>ffmpeg -framerate 60 -video_size 1280x720 -i /dev/video1 out.mkv
  </code></pre>
  
  <p>I get still around 30 fps, and a new (probably more understandable) warning message:</p>
  
  <pre><code>[video4linux2,v4l2 @ 0x1ddc4e0] The driver changed the time per frame from 1/60 to 1/30
  Input #0, video4linux2,v4l2, from '/dev/video1':
    Duration: N/A, start: 256338.694616, bitrate: 442368 kb/s
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 442368 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  </code></pre>
  
  <p>I find several entries for this problem (<code>video4linux2</code> + <code>The driver changed the time per frame</code>), but no clear solution.</p>
  
  <p><strong>Edit 2 + 3</strong>:</p>
  
  <pre><code>v4l2-ctl -d 1 --list-formats-ext
  ioctl: VIDIOC_ENUM_FMT
      Index       : 0
      Type        : Video Capture
      Pixel Format: 'YUYV'
      Name        : YUYV 4:2:2
          Size: Discrete 640x480
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 160x120
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 176x144
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 320x180
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 320x240
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 352x288
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 340x340
              Interval: Discrete 0.033s (30.000 fps)
          Size: Discrete 424x240
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 440x440
              Interval: Discrete 0.033s (30.000 fps)
          Size: Discrete 480x270
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 640x360
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 800x448
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 800x600
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 848x480
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 960x540
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1024x576
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1280x720
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1600x896
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1920x1080
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
  
      Index       : 1
      Type        : Video Capture
      Pixel Format: 'MJPG' (compressed)
      Name        : Motion-JPEG
          Size: Discrete 640x480
              Interval: Discrete 0.008s (120.000 fps)
              Interval: Discrete 0.011s (90.000 fps)
              Interval: Discrete 0.017s (60.000 fps)
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 160x120
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 176x144
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 320x180
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 320x240
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 352x288
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 424x240
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 480x270
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 640x360
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 800x448
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 800x600
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 848x480
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 960x540
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1024x576
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1280x720
              Interval: Discrete 0.011s (90.000 fps)
              Interval: Discrete 0.017s (60.000 fps)
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1600x896
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1920x1080
              Interval: Discrete 0.017s (60.000 fps)
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 2560x1440
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 3840x2160
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 4096x2160
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
  
      Index       : 2
      Type        : Video Capture
      Pixel Format: 'NV12'
      Name        : Y/CbCr 4:2:0
          Size: Discrete 640x480
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 640x360
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1280x720
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
          Size: Discrete 1920x1080
              Interval: Discrete 0.033s (30.000 fps)
              Interval: Discrete 0.042s (24.000 fps)
              Interval: Discrete 0.050s (20.000 fps)
              Interval: Discrete 0.067s (15.000 fps)
              Interval: Discrete 0.100s (10.000 fps)
              Interval: Discrete 0.133s (7.500 fps)
              Interval: Discrete 0.200s (5.000 fps)
  </code></pre>
  
  <p><strong>Edit 4</strong>:</p>
  
  <p>It looks like there may still be a problem using:</p>
  
  <pre><code>ffmpeg -f v4l2 -framerate 60 -video_size 1280x720 -input_format mjpeg -i /dev/video1 out.mkv
  </code></pre>
  
  <p>As the output of ffmpeg looks like:</p>
  
  <pre><code>Output #0, matroska, to 'out.mkv':
    Metadata:
    encoder         : Lavf56.40.101
  Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuvj422p(pc), 1280x720, q=-1--1, 60 fps, 1k tbn, 60 tbc
    Metadata:
    encoder         : Lavc56.60.100 libx264
  Stream mapping:
  Stream #0:0 -&gt; #0:0 (mjpeg (native) -&gt; h264 (libx264))
  Press [q] to stop, [?] for help
  frame=  198 fps= 37 q=-1.0 Lsize=    1043kB time=00:00:05.38 bitrate=1587.4kbits/s
  </code></pre>
  
  <p>Is the fps indicated in the last line (37 instead of 60) reliable? It was working at 60 fps with guvcview, so I do not think the laptop write speeed or CPU is the problem.</p>
  
  <p><strong>Edit 5</strong>:</p>
  
  <p>Thank you for the great help @LordNeckbeard , now it looks like everything works using your additional output argument command <code>ffmpeg -f v4l2 -framerate 60 -video_size 1280x720 -input_format mjpeg -i /dev/video1 -preset faster -pix_fmt yuv420p out.mkv</code>:</p>
  
  <pre><code>$ ffmpeg -f v4l2 -framerate 60 -video_size 1280x720 -input_format mjpeg -i /dev/video1 -preset faster -pix_fmt yuv420p out.mkv 
  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libschroedinger --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-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    libavutil      54. 31.100 / 54. 31.100
    libavcodec     56. 60.100 / 56. 60.100
    libavformat    56. 40.101 / 56. 40.101
    libavdevice    56.  4.100 / 56.  4.100
    libavfilter     5. 40.101 /  5. 40.101
    libavresample   2.  1.  0 /  2.  1.  0
    libswscale      3.  1.101 /  3.  1.101
    libswresample   1.  2.101 /  1.  2.101
    libpostproc    53.  3.100 / 53.  3.100
  [mjpeg @ 0x1d6f320] Changeing bps to 8
  Input #0, video4linux2,v4l2, from '/dev/video1':
    Duration: N/A, start: 259410.922692, bitrate: N/A
      Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, -10 kb/s, 60 fps, 60 tbr, 1000k tbn, 1000k tbc
  [swscaler @ 0x1d7e480] deprecated pixel format used, make sure you did set range correctly
  [libx264 @ 0x1d72620] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  [libx264 @ 0x1d72620] profile High, level 3.2
  [libx264 @ 0x1d72620] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=4 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 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_lookahead=20 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 'out.mkv':
    Metadata:
      encoder         : Lavf56.40.101
      Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 1280x720, q=-1--1, 60 fps, 1k tbn, 60 tbc
      Metadata:
        encoder         : Lavc56.60.100 libx264
  Stream mapping:
    Stream #0:0 -&gt; #0:0 (mjpeg (native) -&gt; h264 (libx264))
  Press [q] to stop, [?] for help
  frame=  467 fps= 59 q=-1.0 Lsize=     914kB time=00:00:07.83 bitrate= 955.8kbits/s    
  video:910kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.434447%
  [libx264 @ 0x1d72620] frame I:2     Avg QP:21.96  size: 61186
  [libx264 @ 0x1d72620] frame P:118   Avg QP:26.01  size:  4695
  [libx264 @ 0x1d72620] frame B:347   Avg QP:27.54  size:   734
  [libx264 @ 0x1d72620] consecutive B-frames:  0.4%  1.3%  0.6% 97.6%
  [libx264 @ 0x1d72620] mb I  I16..4: 14.7% 45.2% 40.0%
  [libx264 @ 0x1d72620] mb P  I16..4:  1.4%  3.7%  0.0%  P16..4: 29.9%  4.1%  0.5%  0.0%  0.0%    skip:60.4%
  [libx264 @ 0x1d72620] mb B  I16..4:  0.2%  0.4%  0.0%  B16..8:  5.4%  0.2%  0.0%  direct: 4.3%  skip:89.6%  L0:53.4% L1:42.7% BI: 3.9%
  [libx264 @ 0x1d72620] 8x8 transform intra:66.4% inter:71.8%
  [libx264 @ 0x1d72620] coded y,uvDC,uvAC intra: 38.1% 50.7% 12.7% inter: 2.8% 7.6% 0.1%
  [libx264 @ 0x1d72620] i16 v,h,dc,p: 36% 36% 16% 11%
  [libx264 @ 0x1d72620] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 32% 37%  2%  2%  2%  4%  1%  5%
  [libx264 @ 0x1d72620] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 46%  8%  2%  3%  3%  4%  3% 12%
  [libx264 @ 0x1d72620] i8c dc,h,v,p: 56% 26% 16%  3%
  [libx264 @ 0x1d72620] Weighted P-Frames: Y:9.3% UV:7.6%
  [libx264 @ 0x1d72620] ref P L0: 58.6% 41.4%
  [libx264 @ 0x1d72620] ref B L0: 56.9% 43.1%
  [libx264 @ 0x1d72620] ref B L1: 85.5% 14.5%
  [libx264 @ 0x1d72620] kb/s:946.85
  </code></pre>