Python ffmpeg displaying output

Question

I want to run command

ffmpeg -i movie.mp4 -vf scale=224:224 movie_224.mp4

to resize video using python language.

I have code for it:

import subprocess
sys_cmd = ["ffmpeg", "-i", "movie.mp4", "-vf", "scale=224:224", movie_224.mp4]
subprocess.check_call(sys_cmd, stdout=subprocess.DEVNULL)

I don't know why I am getting std output even if I have given the argument subprocess.DEVNULL.

Can it be that you are receiving stderr output?

Adelina
– Adelina

2018-07-31 10:59:35 +00:00
Commented Jul 31, 2018 at 10:59 — Adelina
– Adelina, Commented Jul 31, 2018 at 10:59
No. It is regular ffmpeg output.

Pawandeep Singh
– Pawandeep Singh

2018-07-31 11:09:48 +00:00
Commented Jul 31, 2018 at 11:09 — Pawandeep Singh
– Pawandeep Singh, Commented Jul 31, 2018 at 11:09

Adelina · Accepted Answer · 2018-07-31 11:19:11Z

1

Tested it. For some reason it goes to stderr output. To fix it run this command

subprocess.check_call(sys_cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)

answered Jul 31, 2018 at 11:19

Adelina

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