how to pipe from ffmpeg to mencoder?

[marcorocchini]

how to pipe from ffmpeg to mencoder? thanks

[sneaker]

Pipe what? What have you already tried?

[raffriff42]

Years ago (after some trial and error) I piped ffmpeg to mplayer, like this:

ffmpeg -f lavfi -sws_flags bicubic+accurate_rnd -i mandelbrot=s=1280x720 -vcodec huffyuv -pix_fmt rgb24 -f avi - | mplayer -msglevel all=0 -ni -demuxer avi -vo gl -

It's a Mandelbrot fractal, try it; type 'q' to quit.
I wanted mplayer (instead of ffplay) to get the OpenGL renderer for video capturing.

Substituting mplayer with mencoder, you should be able to do something like this:

ffmpeg [options...] -vcodec huffyuv -pix_fmt rgb24 -f avi - | mencoder -ni -demuxer avi [options...] -

Notes:

-vcodec huffyuv  // a codec of some kind seems to be required    
-pix_fmt rgb24   // can't recall if I tried other formats
-f avi           // force AVI wrapper
-                // output to stdout
-msglevel all=0  // optional: show only fatal error messages
-ni              // optional: assume non-interlaced input
-demuxer avi     // force AVI demuxer
-vo gl           // (mplayer) opengl renderer 
-                // input from stdin
-fs              // (mplayer) full screen

[pandy]

You may use y4m format should be recognized by mencoder.