[ AC_MSG_ERROR([Could not find ffmpeg on your system: you may get it from http://ffmpeg.sf.net/ (cvs version is recommended). Alternatively you can use --disable-ffmpeg to disable the ffmpeg plugins.]) ])
AC_CHECK_LIB(avformat, av_open_input_stream, [
AC_DEFINE(HAVE_LIBAVFORMAT, 1,
[ AC_MSG_ERROR([Could not find ffmpeg on your system: you may get it from http://ffmpeg.sf.net/ (cvs version is recommended). Alternatively you can use --disable-ffmpeg to disable the ffmpeg plugins.]) ])
AC_CHECK_LIB(avformat, av_open_input_stream, [
AC_DEFINE(HAVE_LIBAVFORMAT, 1,