I am currently using the following command in python to convert my .webm file to .ogg
subprocess.call(['ffmpeg', '-i', songfile, songfile + ".ogg"])
This prints out a bunch of output which I don't require, But I cannot disable it using this command.
subprocess.call(['ffmpeg', ' -loglevel quiet','-i', songfile, songfile + ".ogg"])
I get error
Unrecognized option '-log-level quiet'.
How can I disable ffmpeg output here?
subprocess.call docs says
To suppress stdout or stderr, supply a value of DEVNULL.
so you might replace
subprocess.call(['ffmpeg', '-i', songfile, songfile + ".ogg"])
using
subprocess.call(['ffmpeg', '-i', songfile, songfile + ".ogg"], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
Daweo's answer is worth looking at, but here is why your attempt did not work: Remember that there is no shell involved when you do subprocess.call (unless you explicitly ask for it), which means that you need to pass -loglevel quiet as two separate items; ..., '-loglevel', 'quiet', ...
Related
I have this ffmpeg command:
ffmpeg -y -i 6.mp4 -vf scale=1280:-2,setsar=1:1 -c:v libx264 -c:a copy 720p.mp4
and I want to implement it via python code. for this I used subprocess function and I use the following code for this:
subprocess.call(['ffmpeg.exe','-y','-i', pname1,'-vf','scale=','1280:-2','setsar=','1:1','-c:v', 'libx264', '-c:a', 'copy', pname2])
pname1 and pname2 are the names of input and output files. this program is running without any error, but it produces nothing. do you know what is the problem?
The correct syntax is:
subprocess.call(['ffmpeg.exe', '-y', '-i', pname1, '-vf', 'scale=1280:-2,setsar=1:1', '-c:v', 'libx264', '-c:a', 'copy', pname2])
Each element in the list (after the first one) represents an argument.
The sperate arguments to FFmpeg may be identified by the spaces between them (when executing FFmpeg in command line).
When executing you original command, I am getting an error message:
[NULL # 0000020fb89bc2c0] Unable to find a suitable output format for '1280:-2'
1280:-2: Invalid argument
The error message is printed to stderr (usually printed to the console).
To see what the process is doing you can capture the output by replacing:
subprocess.call(["command"])
with:
subprocess.check_output(["command"], stderr=subprocess.STDOUT)
See https://docs.python.org/3.9/library/subprocess.html#subprocess.check_output
So your call would become:
ffmpeg_output = subprocess.check_output(
['ffmpeg.exe','-y','-i', pname1,'-vf','scale=','1280:-2','setsar=','1:1','-c:v', 'libx264', '-c:a', 'copy', pname2],
stderr=subprocess.STDOUT
)
print(ffmpeg_output)
I have this command in ffmpeg that I want to write in Python,
ffmpeg -ss 00:12:14 -i video.mp4 -vframes 1 output.png
Is it possible to write this in Python?
Kinda depends on what you mean by 'write this in Python'.
Using the subprocess module:
import subprocess
cmd = ['ffmpeg', '-ss', '00:12:14', '-i', 'video.mp4', '-vframes', '1', 'output.png']
cmdproc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
while True:
line = cmdproc.stdout.readline()
if not line:
break
(or something similar, since there's check_output(), call()...)
If you mean by a 'native' way of doing that, you can try out ffmpeg-python [1],
though I know nothing about that.
[1] - https://github.com/kkroening/ffmpeg-python
using the python bindings, you'd write it like this:
ffmpeg.input('video.mp4', vframes=1, ss=('00:12:14')).output('output.png').run()
(not 100% sure if the ss filter takes the time params like this, if that doesn't work use count of seconds instead)
I am trying to convert a file or microphone stream to 22050 sample rate and change tempo to double. I can do it using terminal with below code;
#ffmpeg -i test.mp3 -af asetrate=44100*0.5,aresample=44100,atempo=2 output.mp3
But i can not run this terminal code with python subprocess. I try many things but every time fail. Generaly i am taking Requested output format 'asetrate' or 'aresample' or 'atempo' is not suitable output format errors. Invalid argument. How can i run it and take a stream with pipe?
song = subprocess.Popen(["ffmpeg.exe", "-i", sys.argv[1], "-f", "asetrate", "22050", "wav", "pipe:1"],
stdout=subprocess.PIPE)
Your two commands are different. Try:
song = subprocess.Popen(["ffmpeg", "-i", sys.argv[1], "-af", "asetrate=22050,aresample=44100,atempo=2", "-f", "wav", "pipe:1"],
-af is for audio filter.
-f is to manually set muxer/output format
ffmpeg interprets whatever supplied by -af as a single argument that it would then parse internally into separate ones, so splitting them out before passing it via Popen would not achieve the same thing.
The initial example using the terminal should be created using Popen as
subprocess.Popen([
'ffmpeg', '-i', 'test.mp3', '-af', 'asetrate=44100*0.5,aresample=44100,atempo=2',
'output.mp3',
])
So for your actual example with pipe, try instead the following:
song = subprocess.Popen(
["ffmpeg.exe", "-i", sys.argv[1], "-f", "asetrate=22050,wav", "pipe:1"],
stdout=subprocess.PIPE
)
You will then need to call song.communicate() to get the output produced by ffmpeg.exe.
I want to crop and re encode videos via ffmpeg from within python using subprocesses.
I managed starting a subprocess using a pure string command and shell=True but I want to build more complex commands and would prefer to use shell=False and passing a list of arguments.
So what works is this form (this is a simplified example, there will be multiple streams in the final version):
import subprocess as sp
sp.Popen('ffmpeg.exe -i Test.avi -filter_complex "[0:v]crop=1024:1024:0:0[out1]" -map [out1] out1.mp4', shell=True)
This script produces the expected cropped output video.
For a list of arguments, I tried:
FFMPEG_PATH = 'ffmpeg.exe'
aviP='Test.avi'
sp.Popen([FFMPEG_PATH,
'-i', aviP,
'-filter_complex', '[0:v]crop=1024:1024:0:0[out1]',
'-map', '[out1] out1.mp4'])
When I execute this second version, simply nothing happens. (no error, no output)
I suspect I am messing up something in the map command syntax?
I think I figured it out:
FFMPEG_PATH = 'ffmpeg.exe'
aviP='Test.avi'
sp.Popen([FFMPEG_PATH,
'-i', aviP,
'-filter_complex', '[0:v]crop=1024:1024:0:0[out1]',
'-map', '[out1]', 'out1.mp4'])
is the correct syntax
I've been trying to pass a command that works only with literal double quotes in the commandline around the "concat:file1|file2" argument for ffmpeg.
I cant however make this work from python with subprocess.Popen(). Anyone have an idea how one passes quotes into subprocess.Popen?
Here is the code:
command = "ffmpeg -i "concat:1.ts|2.ts" -vcodec copy -acodec copy temp.mp4"
output,error = subprocess.Popen(command, universal_newlines=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE).communicate()
When I do this, ffmpeg won't take it any other way other than quotes around the concat segement. Is there a way to successfully pass this line to subprocess.Popen command?
I'd suggest using the list form of invocation rather than the quoted string version:
command = ["ffmpeg", "-i", "concat:1.ts|2.ts", "-vcodec", "copy",
"-acodec", "copy", "temp.mp4"]
output,error = subprocess.Popen(
command, universal_newlines=True,
stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
This more accurately represents the exact set of parameters that are going to be passed to the end process and eliminates the need to mess around with shell quoting.
That said, if you absolutely want to use the plain string version, just use different quotes (and shell=True):
command = 'ffmpeg -i "concat:1.ts|2.ts" -vcodec copy -acodec copy temp.mp4'
output,error = subprocess.Popen(
command, universal_newlines=True, shell=True,
stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
Either use single quotes 'around the "whole pattern"' to automatically escape the doubles or explicitly "escape the \"double quotes\"". Your problem has nothing to do with Popen as such.
Just for the record, I had a problem particularly with a list-based command passed to Popen that would not preserve proper double quotes around a glob pattern (i.e. what was suggested in the accepted answer) under Windows. Joining the list into a string with ' '.join(cmd) before passing it to Popen solved the problem.
This works with python 2.7.3 The command to pipe stderr to stdout has changed since older versions of python:
Put this in a file called test.py:
#!/usr/bin/python
import subprocess
command = 'php -r "echo gethostname();"'
p = subprocess.Popen(command, universal_newlines=True, shell=True,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
text = p.stdout.read()
retcode = p.wait()
print text
Invoke it:
python test.py
It prints my hostname, which is apollo:
apollo
Read up on the manual for subprocess: http://docs.python.org/2/library/subprocess.html
I have been working with a similar issue, with running a relatively complex
command over ssh. It also had multiple double quotes and single quotes. Because
I was piping the command through python, ssh, powershell etc.
If you can instead just convert the command into a shell script, and run the
shell script through subprocess.call/Popen/run, these issues will go away.
So depending on whether you are on windows or on linux or mac, put the
following in a shell script either (script.sh or script.bat)
ffmpeg -i "concat:1.ts|2.ts" -vcodec copy -acodec copy temp.mp4
Then you can run
import subprocess; subprocess.call(`./script.sh`; shell=True)
Without having to worry about single quotes, etc.
This line of code in your question isn't valid Python syntax:
command = "ffmpeg -i "concat:1.ts|2.ts" -vcodec copy -acodec copy temp.mp4"
If you had a Python file with just this line in it, you would get a syntax error. A string literal surrounded with double quotes can't have double quotes in them unless they are escaped with a backslash. So you could fix that line by replacing it with:
command = "ffmpeg -i \"concat:1.ts|2.ts\" -vcodec copy -acodec copy temp.mp4"
Another way to fix this line is to use single quotes for the string literal in Python, that way Python is not confused when the string itself contains a double quote:
command = 'ffmpeg -i "concat:1.ts|2.ts" -vcodec copy -acodec copy temp.mp4'
Once you have fixed the syntax error, you can then tackle the issue with using subprocess, as explained in this answer. I also wrote this answer to explain a helpful mental model for subprocess in general.
Also struggling with a string argument containing spaces and not wanting to use the shell=True.
The solution was to use double quotes for the inside strings.
args = ['salt', '-G', 'environment:DEV', 'grains.setvals', '{"man_version": "man-dev-2.3"}']
try:
p = subprocess.Popen(args, stdin=subprocess.PIPE
, stdout=subprocess.PIPE
, stderr=subprocess.PIPE
)
(stdin,stderr) = p.communicate()
except (subprocess.CalledProcessError, OSError ) as err:
exit(1)
if p.returncode != 0:
print("Failure in returncode of command:")
Anybody suffering from this pain. It also works with params enclosed with quotation marks.
params = ["ls", "-la"]
subprocess.check_output(" ".join(params), shell=True)