Question

I am trying to run this command here:

f = open("|ffmpeg -i /Users/joaoh82/Desktop/teste.MP4")
result = f.read()

But I am not getting any response…

But when I try this command in the terminal it works great:

ffmpeg -i /Users/joaoh82/Desktop/teste.MP4

But now on rails code. Funny thing is that when I try the same thing with some else like an echo $PATH it works great! Like:

f = open("|echo $PATH")
result = f.read()

Any ideas!?

Answer 1

ffmpeg -i prints to stderr, which won’t be captured by your pipe. You could redirect stderr to stdout:

result = `ffmpeg -i /Users/joaoh82/Desktop/teste.MP4 2>&1`