ffmpeg -i Lepa.mp4  -vf "ass=lepa.ass" Lesa.mp4
ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jun 23 2013 11:35:06 with gcc 4.7.1
  configuration: --prefix=/usr --libdir=/usr/lib --shlibdir=/usr/lib --mandir=/usr/man --disable-debug --enable-shared --disable-static --enable-pthreads --enable-libtheora --enable-libvorbis --enable-gpl --enable-version3 --enable-postproc --enable-swscale --enable-x11grab --enable-avfilter --enable-gnutls --enable-libcdio --arch=i486 --enable-libmp3lame --enable-libx264 --enable-libass
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Lepa.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2012-12-04 13:45:01
  Duration: 02:09:28.65, start: 0.000000, bitrate: 418 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 608x256, 320 kb/s, 25 fps, 25 tbr, 50 tbn, 50 tbc
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 96 kb/s
    Metadata:
      creation_time   : 2012-12-04 13:45:06
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
[buffer @ 0x9d9b140] w:608 h:256 pixfmt:yuv420p tb:1/50 sar:0/1 sws_param:flags=2
[buffersink @ 0x9d9b4c0] No opaque field provided
[ass @ 0x9d9c7e0] Added subtitle file: 'lepa.ass' (2 styles, 1194 events)
[aformat @ 0x9e4f8e0] auto-inserting filter 'auto-inserted resampler 0' between the filter 'src' and the filter 'aformat'
[aresample @ 0x9e41d20] chl:stereo fmt:s16 r:44100Hz -> chl:stereo fmt:flt r:44100Hz
[libx264 @ 0x9d840e0] using cpu capabilities: MMX2 SSE2 SSE3 Cache64
[libx264 @ 0x9d840e0] profile High, level 2.1
[libx264 @ 0x9d840e0] 264 - core 125 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 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=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[NULL @ 0x9d9ba60] Codec is experimental but experimental codecs are not enabled, try -strict -2
Output #0, mp4, to 'Lesa.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2012-12-04 13:45:01
    Stream #0:0(und): Video: h264, yuv420p, 608x256, q=-1--1, 90k tbn, 25 tbc
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: none, 44100 Hz, stereo, flt, 128 kb/s
    Metadata:
      creation_time   : 2012-12-04 13:45:06
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (aac -> aac)
Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height