cat /dev/video1 | ./ffmpeg -f mpegts -i - -c:v libx264 -preset veryfast -tune zerolatency -b:v 3500k -maxrate 3500k -bufsize 3500k -c:a aac -strict -2 -b:a 128k -y testfile.flv
ffmpeg version N-58456-ga9a3afe Copyright (c) 2000-2013 the FFmpeg developers
  built on Nov 26 2013 05:33:17 with gcc 4.6 (Debian 4.6.3-1)
  configuration: --prefix=/root/ffmpeg-static/64bit --extra-cflags='-I/root/ffmpeg-static/64bit/include -static' --extra-ldflags='-L/root/ffmpeg-static/64bit/lib -static' --extra-libs='-lxml2 -lexpat -lfreetype' --enable-static --disable-shared --disable-ffserver --disable-doc --enable-bzlib --enable-zlib --enable-postproc --enable-runtime-cpudetect --enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype --enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-version3 --enable-libvpx
  libavutil      52. 54.100 / 52. 54.100
  libavcodec     55. 44.100 / 55. 44.100
  libavformat    55. 21.102 / 55. 21.102
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 91.100 /  3. 91.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
^C[mpegts @ 0x26e62e0] Could not detect TS packet size, defaulting to non-FEC/DVHS
pipe:: could not find codec parameters
Received signal 2: terminating.