> So I assume that will hold large volumes of data? Why do you want ffmpeg to buffer a lot of data? If you don't care where it's buffered you could use pv or mbuffer ... <your application> | pv -B 1G > fifo ffmpeg -i fifo ... # or to buffer it in the sandbox <your application> > fifo pv -B 1G < fifo > fifo2 ffmpeg -i fifo2 ... Kirk