[x264-devel] read from stdin

[Téssio Fechine]

In the "x264-encoding-guide" x264 is used with the "-" parameter to specify stdin as the "input file".. but when I try this in my linux box it prints this msg: cold not open input file '-' ..
What I'm doing wrong? 

The command I'm trying: "mplayer -nosound -benchmark -vo yuv4mpeg:file=>(x264 --demuxer y4m --crf 20 --threads auto --output output.264 - 2>x264.log) movie.mkv" 

Thanks..