-> cat *.jpg|ffmpeg -f image2pipe -r 10 -vcodec mjpeg -i - -vcodec libx264 output.mp4
ffmpeg version N-41211-g0766b6e Copyright (c) 2000-2012 the FFmpeg developers
  built on Jun  1 2012 12:01:56 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  configuration: --enable-gpl --enable-libmp3lame --enable-libtheora --enable-libvo-aacenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-version3
  libavutil      51. 56.100 / 51. 56.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.101 / 54.  6.101
  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
-bash: /bin/cat: Argument list too long
[image2pipe @ 0x9efb540] Could not find codec parameters (Video: mjpeg)
[image2pipe @ 0x9efb540] Estimating duration from bitrate, this may be inaccurate
pipe:: could not find codec parameters