On Wed, 16 Jun 2004 20:13:30 +0100
Anne Wilson <[EMAIL PROTECTED]> wrote:

> ppmtoy4m -n 250 -r newbyhall.ppm
> 
> I was not happy with the command, as I would have thought it wanted 
> input and output parameters,

Like many unix tools ppmtoy4m is a filter which means it takes input
from stdin (your keyboard by default) and sends output to stdout (your
terminal by default). This makes it easy to use in pipelines.
You need to redirect stdout, either to a file with > or to the input
of another program with |
You probably want something like
  ppmtoy4m -n 250 -r newbyhall.ppm | mpeg2enc

Martin


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