alex-gentoo@alex-gentoo /media/2teras/datos/Peliculas, DVDs, Conciertos, Videos etc/SuperNatural $ ffmpeg -y -i video.h264 -an -pass 2 -vcodec libx264  -b 1500 -bt 1500 -threads 0 OUTPUT.mp4ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
  built on Feb 23 2012 18:01:53 with gcc 4.5.3
  configuration: --prefix=/usr --libdir=/usr/lib --shlibdir=/usr/lib --mandir=/usr/share/man --enable-shared --cc=i686-pc-linux-gnu-gcc --cxx=i686-pc-linux-gnu-g++ --ar=i686-pc-linux-gnu-ar --optflags='-O2 -fomit-frame-pointer -march=native -pipe -m3dnow -mmmx -msse -msse2 -msse3 -D_FORTIFY_SOURCE=2 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -mno-popcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-avx -mno-sse4.2 -mno-sse4.1 --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-size=1024 ' --extra-cflags='-O2 -fomit-frame-pointer -march=native -pipe -m3dnow -mmmx -msse -msse2 -msse3 -D_FORTIFY_SOURCE=2 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -mno-popcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-avx -mno-sse4.2 -mno-sse4.1 --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-size=1024 ' --extra-cxxflags='-O2 -fomit-frame-pointer -march=native -pipe -m3dnow -mmmx -msse -msse2 -msse3 -D_FORTIFY_SOURCE=2 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -m  libavutil      51. 34.101 / 51. 34.101
  libavcodec     53. 60.100 / 53. 60.100
  libavformat    53. 31.100 / 53. 31.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 60.100 /  2. 60.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
[h264 @ 0x9879aa0] Format h264 detected only with low score of 1, misdetection possible!
[h264 @ 0x9879aa0] Could not find codec parameters (Video: h264)
[h264 @ 0x9879aa0] Estimating duration from bitrate, this may be inaccurate
video.h264: could not find codec parameters