{stdenv, fetchurl, faad2, libtheora, speex, libvorbis, x264, pkgconfig, xvidcore, lame, yasm
, vpxSupport ? false, libvpx ? null}:

stdenv.mkDerivation {
  name = "ffmpeg-0.6";
  
  src = fetchurl {
    url = http://www.ffmpeg.org/releases/ffmpeg-0.6.tar.bz2;
    sha256 = "08419kg2i8j7x4mb3vm6a73fdszivj6lzh7lypxby30gfnkblc37";
  };
  
  # `--enable-gpl' (as well as the `postproc' and `swscale') mean that
  # the resulting library is GPL'ed, so it can only be used in GPL'ed
  # applications.
  configureFlags = [
    "--enable-gpl"
    "--enable-postproc"
    "--enable-swscale"
    "--disable-ffserver"
    "--disable-ffplay"
    "--enable-libfaad"
    "--enable-shared"
    "--enable-libtheora"
    "--enable-libvorbis"
    "--enable-libspeex"
    "--enable-libx264"
    "--enable-libxvid"
    "--enable-libmp3lame"
    "--enable-runtime-cpudetect"
  ] ++
    stdenv.lib.optional vpxSupport "--enable-libvpx";

  buildInputs = [ faad2 libtheora speex libvorbis x264 pkgconfig xvidcore lame yasm ]
    ++ stdenv.lib.optional vpxSupport libvpx;

  meta = {
    homepage = http://www.ffmpeg.org/;
    description = "A complete, cross-platform solution to record, convert and stream audio and video";
  };
}