knighthawk3@ananke:~/public_html/Ryuko$ ffmpeg -loglevel info -ss 497 -i KnK03.mkv -t 7 -r 8 -vf scale=500:-1,ass=sub.ass ./gif/%08d.png
ffmpeg version N-57552-g69a042e Copyright (c) 2000-2013 the FFmpeg developers
  built on Nov  2 2013 21:02:37 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu8)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-x11grab --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libdc1394 --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libass
  libavutil      52. 48.100 / 52. 48.100
  libavcodec     55. 39.100 / 55. 39.100
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, matroska,webm, from 'KnK03.mkv':
  Metadata:
    creation_time   : 2013-10-16 16:36:33
  Duration: 00:23:42.13, start: 0.000000, bitrate: 1905 kb/s
    Stream #0:0: Video: h264 (High), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 23.81 fps, 23.81 tbr, 1k tbn, 47.95 tbc (default) (forced)
    Stream #0:1: Audio: aac, 44100 Hz, stereo, fltp (default) (forced)
    Stream #0:2: Subtitle: ssa (default) (forced)
Codec 0x18000 is not in the full list.
    Stream #0:3: Attachment: unknown_codec
    Metadata:
      filename        : OpenSans-Semibold.ttf
      mimetype        : application/x-truetype-font
[Parsed_ass_1 @ 0x23c4100] Added subtitle file: 'sub.ass' (2 styles, 297 events)
Output #0, image2, to './gif/%08d.png':
  Metadata:
    encoder         : Lavf55.19.104
    Stream #0:0: Video: png, rgb24, 500x281 [SAR 1124:1125 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 8 tbc (default) (forced)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> png)
Press [q] to stop, [?] for help
[Parsed_ass_1 @ 0x23c4100] Neither PlayResX nor PlayResY defined. Assuming 384x288
[Parsed_ass_1 @ 0x23c4100] fontconfig: Selected font is not the requested one: 'Nimbus Sans L' != 'Arial'
[Parsed_ass_1 @ 0x23c4100] fontconfig: Selected font is not the requested one: 'DejaVu Sans' != 'Open Sans Semibold'
[Parsed_ass_1 @ 0x23c4100] fontconfig: Selected font is not the requested one: 'DejaVu Sans Bold' != 'Open Sans Semibold'
frame=   56 fps= 25 q=0.0 Lsize=N/A time=00:00:07.00 bitrate=N/A dup=0 drop=104
video:9900kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.000217%