ffmpeg

ffmpeg -y -start_number 0000 -r 10 -i Renumbered/renumbered%04d.tif thumbnails.webm
ffmpeg version N-78043-g1d8f9b7 Copyright (c) 2000-2016 the FFmpeg developers
  built with Apple LLVM version 7.0.2 (clang-700.1.81)
  configuration: --prefix=/usr/local/ffmpeg-clang --enable-gpl --enable-version3 --disable-static --enable-shared --enable-pthreads --enable-vda --disable-indev=jack --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcelt --enable-libcdio --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libkvazaar --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-librubberband --enable-libschroedinger --disable-libsmbclient --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-opencl --enable-opengl --disable-x11grab --enable-zlib --extra-cflags=-I/sw/include --extra-ldflags='-Wl,-dead_strip_dylibs' --cc=clang
  libavutil      55. 14.100 / 55. 14.100
  libavcodec     57. 22.100 / 57. 22.100
  libavformat    57. 23.100 / 57. 23.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 27.100 /  6. 27.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, image2, from 'Renumbered/renumbered%04d.tif':
  Duration: 00:00:32.52, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: tiff, rgb24, 320x214, 25 fps, 25 tbr, 25 tbn, 25 tbc
[libvpx-vp9 @ 0x7fe571012c00] v1.5.0
Output #0, webm, to 'thumbnails.webm':
  Metadata:
    encoder         : Lavf57.23.100
    Stream #0:0: Video: vp9 (libvpx-vp9), yuv444p, 320x214, q=-1--1, 200 kb/s, 10 fps, 1k tbn, 10 tbc
    Metadata:
      encoder         : Lavc57.22.100 libvpx-vp9
    Side data:
      unknown side data type 10 (24 bytes)
Stream mapping:
  Stream #0:0 -> #0:0 (tiff (native) -> vp9 (libvpx-vp9))
Press [q] to stop, [?] for help
frame=  813 fps= 15 q=0.0 Lsize=    1104kB time=00:01:21.30 bitrate= 111.3kbits/s speed=1.49x
video:1098kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.557991%