Nofew@Nofware ~/ffmpeg
$ ./gdb ffmpeg_g.exe
GNU gdb (GDB) 7.5
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-w64-mingw32".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from C:\cygwin\home\Nofew\ffmpeg\ffmpeg_g.exe...done.
(gdb) run -i tears_of_steel_1080p.mkv -vcodec libx264 -preset medium -crf 18 -rc-lookahead 60 -acodec copy OUT.mp4
Starting program: C:\cygwin\home\Nofew\ffmpeg\ffmpeg_g.exe -i tears_of_steel_1080p.mkv -vcodec libx264 -preset medium -crf 18 -rc-lookahead 60 -acodec copy OUT.mp4
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ffmpeg version N-49062-g3fba3e7 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan 20 2013 15:20:32 with gcc 4.5.3 (GCC)
  configuration: --extra-cflags='-I/home/Nofew/thingyx/include -U__STRICT_ANSI__' --extra-ldflags=-L/home/Nofew/thingyx/lib --prefix=/home/Nofew/thingyx --arch=x86_64 --target-os=mingw32 --cross-prefix=x86_64-w64-mingw32- --enable-gpl --enable-libx264 --disable-indevs --enable-cross-compile --disable-doc
  libavutil      52. 15.100 / 52. 15.100
  libavcodec     54. 89.100 / 54. 89.100
  libavformat    54. 61.101 / 54. 61.101
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 32.101 /  3. 32.101
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Input #0, matroska,webm, from 'tears_of_steel_1080p.mkv':
  Metadata:
    TITLE           :
    ARTIST          :
    COMPOSER        :
    SYNOPSIS        :
    DATE_RELEASED   :
    GENRE           :
  Duration: 00:12:14.17, start: 0.000000, bitrate: 6273 kb/s
    Stream #0:0(eng): Video: theora, yuv420p, 1920x800 [SAR 1:1 DAR 12:5], 24 fps, 24 tbr, 1k tbn, 24 tbc (default)
    Stream #0:1(eng): Audio: aac, 44100 Hz, stereo, fltp (default)
[libx264 @ 0000000006e500a0] using SAR=1/1
[libx264 @ 0000000006e500a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
[libx264 @ 0000000006e500a0] profile High, level 4.0
[libx264 @ 0000000006e500a0] 264 - core 129 r2245M bc13772 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - 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=12 lookahead_threads=2 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=24 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'OUT.mp4':
  Metadata:
    TITLE           :
    ARTIST          :
    COMPOSER        :
    SYNOPSIS        :
    DATE_RELEASED   :
    GENRE           :
    encoder         : Lavf54.61.101
    Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1920x800 [SAR 1:1 DAR 12:5], q=-1--1, 12288 tbn, 24 tbc (default)
    Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo (default)
Stream mapping:
  Stream #0:0 -> #0:0 (theora -> libx264)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
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Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 7740.0x1ee4]
___chkstk ()
    at /cygdrive/i/szsz/tmpp/64gcc/mingw64-x86_64-gcc-4.5.3-6/src/gcc-4.5.3/libgcc/../gcc/config/i386/cygwin.asm:110
(gdb) 110       /cygdrive/i/szsz/tmpp/64gcc/mingw64-x86_64-gcc-4.5.3-6/src/gcc-4.5.3/libgcc/../gcc/config/i386/cygwin.asm: No such file or directory.