root@mini2:~# mythffmpeg -i /nas/video/Action/Captain\ America.m4v 
FFmpeg version UNKNOWN, Copyright (c) 2000-2010 the FFmpeg developers
  built on Jan 24 2012 00:27:29 with gcc 4.4.3
  configuration: --compile-type=profile --prefix=/usr --runprefix=/usr --enable-crystalhd --enable-lirc --enable-audio-alsa --enable-audio-oss --enable-dvb --enable-ivtv --enable-firewire --enable-joystick-menu --with-bindings=perl --enable-ffmpeg-pthreads --enable-pic --perl-config-opts='INSTALLDIRS=vendor' --enable-opengl-vsync --enable-opengl-video --cpu=i686 --enable-mmx --disable-xvmc --enable-vdpau
  libavutil     50.24. 0 / 50.24. 0
  libavcore      0. 6. 0 /  0. 6. 0
  libavcodec    52.86. 1 / 52.86. 1
  libavformat   52.78. 3 / 52.78. 3
  libavdevice   52. 2. 1 / 52. 2. 1
  libavfilter    1.37. 0 /  1.37. 0
  libswscale     0.11. 0 /  0.11. 0
  libpostproc   51. 2. 0 / 51. 2. 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x8df26b0] max_analyze_duration reached

Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/nas/video/Action/Captain America.m4v':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    encoder         : HandBrake 0.9.5 2011010300
  Duration: 02:04:10.07, start: 0.000000, bitrate: 1518 kb/s
    Chapter #0.0: start -0.116789, end 491.157333
    Metadata:
      title           : Chapter  1
    Chapter #0.1: start 491.157333, end 895.895000
    Metadata:
      title           : Chapter  2
    Chapter #0.2: start 895.895000, end 1460.625833
    Metadata:
      title           : Chapter  3
    Chapter #0.3: start 1460.625833, end 1838.169667
    Metadata:
      title           : Chapter  4
    Chapter #0.4: start 1838.169667, end 2318.849867
    Metadata:
      title           : Chapter  5
    Chapter #0.5: start 2318.849867, end 2751.248500
    Metadata:
      title           : Chapter  6
    Chapter #0.6: start 2751.248500, end 3117.147367
    Metadata:
      title           : Chapter  7
    Chapter #0.7: start 3117.147367, end 3474.637833
    Metadata:
      title           : Chapter  8
    Chapter #0.8: start 3474.637833, end 3838.343756
    Metadata:
      title           : Chapter  9
    Chapter #0.9: start 3838.343756, end 4341.679922
    Metadata:
      title           : Chapter 10
    Chapter #0.10: start 4341.679922, end 4749.754256
    Metadata:
      title           : Chapter 11
    Chapter #0.11: start 4749.754256, end 5306.143422
    Metadata:
      title           : Chapter 12
    Chapter #0.12: start 5306.143422, end 5632.002289
    Metadata:
      title           : Chapter 13
    Chapter #0.13: start 5632.002289, end 6139.342456
    Metadata:
      title           : Chapter 14
    Chapter #0.14: start 6139.342456, end 6644.146756
    Metadata:
      title           : Chapter 15
    Chapter #0.15: start 6644.146756, end 6825.327756
    Metadata:
      title           : Chapter 16
    Chapter #0.16: start 6825.327756, end 7449.801600
    Metadata:
      title           : Chapter 18
    Stream #0.0(und): Video: h264, yuv420p, 720x368 [PAR 32:27 DAR 160:69], 735 kb/s, 23.97 fps, 90k tbr, 90k tbn, 180k tbc
    Stream #0.1(eng): Audio: ac3, 48000 Hz, 2 channels, s16, 448 kb/s
    Stream #0.2(eng): Audio: aac, 48000 Hz, stereo, s16, 328 kb/s
    Stream #0.3(und): Subtitle: text / 0x74786574