How can pipe data in python without cat command?

Asked Sep 16 '14 at 07:19

Active Sep 16 '14 at 07:32

Viewed 66 times

I have the following working code in first.py:

import os 
os.system('cat python_better_than_java.wav')

which I can execute like this

python first.py |  ffmpeg -y -f wav -i pipe:0 -f mp3 - >hi.mp3

this works.

I want do this in a pythonic way, so I edited first.py to this:

import sys
with open('python_better_than_java.wav', 'rb') as content_file:
    content = content_file.read()
sys.stdout.write(content)

and executed it using:

python first.py | ffmpeg -y -f wav -i pipe:0 -f mp3 - >hi.mp3

but then it produces the following error:

pipe:0: Invalid data found when processing input

How can I reproduce cat in python?

edited Sep 16 '14 at 07:32

asked Sep 16 '14 at 07:19

ebola virus

What happens if you do `python first.py > output` and then `diff output python_better_than_java.wav`? – Duncan Jones Sep 16 '14 at 08:29
@Duncan Binary files t.py.wav and u.py.wav differ – ebola virus Sep 16 '14 at 08:45
It should work. Is the size of `output` equal to `python_better_than_java.wav`? What operating system / python version are you using? – Juan Cespedes Sep 16 '14 at 10:15
4kb size difference in file. but possible to play both file.i am using window 7 32 bit and python 2.7 – ebola virus Sep 16 '14 at 10:40
It's a shame this is a duplicate, 'cause there's was lot of rep to be had... – Veedrac Sep 16 '14 at 15:50

0 Answers0