$ ffmpeg -i 20071130_000000_sany0027.mov -b:v 2M -c:v libvpx webp2.mp4
ffmpeg version 3.1.1 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/doc/ffmpeg-3.1.1 --mandir=/usr/man --enable-gpl --enable-version3 --enable-avfilter --enable-avresample --enable-libass --enable-libdc1394 --enable-libgsm --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libzvbi --enable-postproc --enable-runtime-cpudetect --enable-vaapi --enable-vdpau --enable-memalign-hack --enable-pthreads --enable-x11grab --enable-bzlib --enable-zlib --enable-shared --enable-static --disable-debug --enable-gnutls --arch=x86_64 --enable-pic --extra-cflags='-I/tmp/build/tmp-ffmpeg/ffmpegdeps/usr/include -I/tmp/build/tmp-ffmpeg/ffmpegdeps/usr/include/SDL -DRUNTIME_CPUDETECT' --extra-ldflags='-L/tmp/build/tmp-ffmpeg/ffmpegdeps/usr/lib64 -ldl -lssl -lcrypto -lz -lusb' --pkg-config-flags=--static
  libavutil      55. 28.100 / 55. 28.100
  libavcodec     57. 48.101 / 57. 48.101
  libavformat    57. 41.100 / 57. 41.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 47.100 /  6. 47.100
  libavresample   3.  0.  0 /  3.  0.  0
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  1.100 /  2.  1.100
  libpostproc    54.  0.100 / 54.  0.100
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20071130_000000_sany0027.mov':
  Metadata:
    creation_time   : 2005-09-01 00:00:00
    original_format : Digital Camera
    original_format-eng: Digital Camera
    comment         : SANYO DIGITAL CAMERA E6
    comment-eng     : SANYO DIGITAL CAMERA E6
  Duration: 00:03:50.17, start: 0.000000, bitrate: 11365 kb/s
    Stream #0:0(eng): Video: mjpeg (jpeg / 0x6765706A), yuvj422p(pc, bt470bg/unknown/unknown), 640x480, 11281 kb/s, 30 fps, 30 tbr, 600 tbn, 600 tbc (default)
    Metadata:
      creation_time   : 2005-09-01 00:00:00
      encoder         : Photo - JPEG
    Stream #0:1(eng): Audio: pcm_u8 (raw  / 0x20776172), 7875 Hz, 1 channels, u8, 63 kb/s (default)
    Metadata:
      creation_time   : 2005-09-01 00:00:00
[swscaler @ 0x164d400] deprecated pixel format used, make sure you did set range correctly
[libvpx @ 0x150d6e0] v1.5.0
[aac @ 0x150ef20] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
[mp4 @ 0x14d2c80] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
    Last message repeated 1 times
[mp4 @ 0x14d2c80] Could not find tag for codec vp8 in stream #0, codec not currently supported in container
Output #0, mp4, to 'webp2.mp4':
  Metadata:
    comment-eng     : SANYO DIGITAL CAMERA E6
    original_format : Digital Camera
    original_format-eng: Digital Camera
    comment         : SANYO DIGITAL CAMERA E6
    encoder         : Lavf57.41.100
    Stream #0:0(eng): Video: vp8 (libvpx), yuv420p, 640x480, q=-1--1, 2000 kb/s, 30 fps, 30 tbn, 30 tbc (default)
    Metadata:
      creation_time   : 2005-09-01 00:00:00
      encoder         : Lavc57.48.101 libvpx
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 8000 Hz, mono, fltp, 48 kb/s (default)
    Metadata:
      creation_time   : 2005-09-01 00:00:00
      encoder         : Lavc57.48.101 aac
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> vp8 (libvpx))
  Stream #0:1 -> #0:1 (pcm_u8 (native) -> aac (native))
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
[aac @ 0x150ef20] Qavg: -nan