On Wed, 28 Jun 2017, shalin wrote:
Nicolas George wrote
I think you need to take a little step back and learn what Unix pipes
mean. They are meant to connect the output of a process to the input of
the next one, but in your examples your commands neither consume their
input nor produce output.
Piping only shows that I am trying to run all three ffmpeg transcode
instances in parallel using single command line. If it makes any
clearer, you can read them as three separate commands issued at the same
time. With that, I hope we can focus on the concern raised in the
original question.
As Nicolas already said, you need to take a closer look at "piping" vs
"background processing" in the UNIX shell.
What you are doing is PIPING:
<process 1> | <process 2> | <process 3>
This takes the output of process 1 and uses it as the input to process 2,
then the output of process 2 and uses it as the input to process 3.
It sounds like what you want is BACKGROUND PROCESSING:
<process 1> & <process 2> & process 3 &
This puts all 3 processes in the background and runs them concurrently.
You might want to check out some basics of the UNIX shell, such as this
link:
https://www.washington.edu/computing/unix/startdoc/shell.html
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