Stuff

ffmpeg2 -i big_buck_bunny_1080p_h264.mov -i logo.png -filter_complex 'overlay=10:main_h-overlay_h-10:enable=lte(t,10)' -t 20 20.mp4


ffmpeg version 2.0 Copyright (c) 2000-2013 the FFmpeg developers
  built on Aug  6 2013 16:10:49 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-52)
  configuration:  --enable-static --enable-postproc --enable-gpl --enable-avfilter --enable-libx264 --enable-libxvid --enable-libmp3lame --enable-libfaac --enable-pthreads --enable-swscale --enable-runtime-cpudetect --disable-devices --disable-avdevice --extra-ldflags=-static --disable-shared --enable-bzlib --enable-zlib --extra-libs='-lx264 -lxvidcore -lmp3lame -lpthread -lm -lbz2 -lz -lpthread -lvpx -lass -lfontconfig -lexpat -lfreetype -lfaac' --disable-encoder=libgsm --disable-decoder=libgsm --disable-doc --enable-libvpx --enable-libass --enable-version3 --enable-nonfree --enable-libfreetype
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.100 / 55. 12.100
  libavfilter     3. 79.101 /  3. 79.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'big_buck_bunny_1080p_h264.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2008-05-27 18:40:35
    timecode        : 00:00:00:00
  Duration: 00:09:56.46, start: 0.000000, bitrate: 9725 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080, 9282 kb/s, 24 fps, 24 tbr, 2400 tbn, 4800 tbc
    Metadata:
      creation_time   : 2008-05-27 18:40:35
      handler_name    : Apple Alias Data Handler
    Stream #0:1(eng): Data: none (tmcd / 0x64636D74)
    Metadata:
      creation_time   : 2008-05-27 18:40:35
      handler_name    : Apple Alias Data Handler
      timecode        : 00:00:00:00
    Stream #0:2(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 437 kb/s
    Metadata:
      creation_time   : 2008-05-27 18:40:35
      handler_name    : Apple Alias Data Handler
Input #1, image2, from 'logo.png':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #1:0: Video: png, rgba, 500x500, 25 tbr, 25 tbn, 25 tbc
[overlay @ 0x5c54640] [Eval @ 0x7fff7cd79e00] Missing ')' or too many args in 'lte(t'
[overlay @ 0x5c54640] Error when evaluating the expression 'lte(t' for enable
[AVFilterGraph @ 0x5d1fb60] Error initializing filter 'overlay' with args '10:main_h-overlay_h-10:enable=lte(t'
Error configuring filters.