CODEWITHSUNDEEP
pythonvideoffmpeg
OSK
OSK

Reputation: 167

Using ffmpeg to obtain video durations in python

I've installed ffprobe using the pip ffprobe command on my PC, and installed ffmpeg from here.

However, I'm still having trouble running the code listed here.

I try to use the following code unsuccessfully.

SyntaxError: Non-ASCII character '\xe2' in file GetVideoDurations.py
on line 12, but no encoding declared; see
http://python.org/dev/peps/pep-0263/ for details

Does anyone know what's wrong? Am I not referencing the directories correctly? Do I need to make sure the .py and video files are in a specific location?

import subprocess

def getLength(filename):
    result = subprocess.Popen(["ffprobe", "filename"],
    stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
    return [x for x in result.stdout.readlines() if "Duration" in x]

fileToWorkWith = ‪'C:\Users\PC\Desktop\Video.mkv'

getLength(fileToWorkWith)

Apologies if the question is somewhat basic. All I need is to be able to iterate over a group of video files and get their start time and end time.

Thank you!

Upvotes: 13

Views: 29226

Answers (10)

lovetl2002
lovetl2002

Reputation: 1068

Just encountered a situation where meta data returned by ffmpeg.probe is wrong. If you encountered the same problem, use the following command to get the real duration:

probe = ffmpeg.probe(filepath, show_packets=None)
duration = float(probe['packets'][-1]['dts_time'])

Note that in my case the file only has one stream. If your file have multiple frames, you may need to specify stream_index.

Upvotes: 0

Jorgu
Jorgu

Reputation: 194

Using the ffmpeg-python package (https://pypi.org/project/ffmpeg-python/)

import ffmpeg
duration = ffmpeg.probe(local_file_path)["format"]["duration"]

where local_file_path is a relative or absolute path to your file.

Upvotes: 14

lifegpc
lifegpc

Reputation: 21

I like to build a shared library with ffmpeg, and load it in python.
C++ code:

#ifdef __WIN32__
#define LIB_CLASS __declspec(dllexport)
#else
#define LIB_CLASS
#endif
extern "C" {
#define __STDC_CONSTANT_MACROS
#include "libavformat/avformat.h"
}
extern "C" LIB_CLASS int64_t getDur(const char* url) {
    AVFormatContext* pFormatContext = avformat_alloc_context();
    if (avformat_open_input(&pFormatContext, url, NULL, NULL)) {
        avformat_free_context(pFormatContext);
        return -1;
    }
    int64_t t = pFormatContext->duration;
    avformat_close_input(&pFormatContext);
    avformat_free_context(pFormatContext);
    return t;
}

Then use gcc to compile it and get a shared library.
Python code:

from ctypes import *
lib = CDLL('/the/path/to/your/library')
getDur = lib.getDur
getDur.restype = c_longlong
duration = getDur('the path/URL to your file')

It works well in my python program.

Upvotes: 0

alper
alper

Reputation: 3410

Updated solution using ffprobe based on @llogan guidance with the pointed link:

import subprocess

def get_duration(input_video):
    cmd = ["ffprobe", "-i", input_video, "-show_entries", "format=duration",
           "-v", "quiet", "-sexagesimal", "-of", "csv=p=0"]
    return subprocess.check_output(cmd).decode("utf-8").strip()

Fragile Solution due to stderr output:

the stderr output from ffmpeg is not intended for machine parsing and is considered fragile.

I get help from the following documentation (https://codingwithcody.com/2014/05/14/get-video-duration-with-ffmpeg-and-python/) and https://stackoverflow.com/a/6239379/2402577

Actually, sed is unnecessary: ffmpeg -i file.mp4 2>&1 | grep -o -P "(?<=Duration: ).*?(?=,)"

You can use the following method to get the duration in HH:MM:SS format:

import subprocess

def get_duration(input_video):
    # cmd: ffmpeg -i file.mkv 2>&1 | grep -o -P "(?<=Duration: ).*?(?=,)"
    p1 = subprocess.Popen(['ffmpeg',  '-i', input_video], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    p2 = subprocess.Popen(["grep",  "-o", "-P", "(?<=Duration: ).*?(?=,)"], stdin=p1.stdout, stdout=subprocess.PIPE)
    p1.stdout.close()
    return p2.communicate()[0].decode("utf-8").strip()

Example output for both: 01:37:11.83

Upvotes: 3

Vishwanath Hiremath
Vishwanath Hiremath

Reputation: 211

we can also use ffmpeg to get the duration of any video or audio files.

To install ffmpeg follow this link

import subprocess
import re

process = subprocess.Popen(['ffmpeg',  '-i', path_of_video_file], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdout, stderr = process.communicate()
matches = re.search(r"Duration:\s{1}(?P<hours>\d+?):(?P<minutes>\d+?):(?P<seconds>\d+\.\d+?),", stdout, re.DOTALL).groupdict()

print (matches['hours'])
print (matches['minutes'])
print (matches['seconds'])

Upvotes: -2

Chamath
Chamath

Reputation: 2044

There is no need to iterate though the output of FFprobe. There is one simple command which returns only the duration of the input file:

ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 <input_video>

You can use the following method instead to get the duration:

def get_length(input_video):
    result = subprocess.run(['ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'default=noprint_wrappers=1:nokey=1', input_video], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    return float(result.stdout)

Upvotes: 23

Gabriel Coutinho De Miranda
Gabriel Coutinho De Miranda

Reputation: 257

Have you tried adding the encoding? That error is typical of that, as Chamath said. Add the utf-8 encoding to your script header:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

Upvotes: 0

Kalob Taulien
Kalob Taulien

Reputation: 1918

I'd suggest using FFprobe (comes with FFmpeg).

The answer Chamath gave was pretty close, but ultimately failed for me.

Just as a note, I'm using Python 3.5 and 3.6 and this is what worked for me. 

import subprocess 

def get_duration(file):
    """Get the duration of a video using ffprobe."""
    cmd = 'ffprobe -i {} -show_entries format=duration -v quiet -of csv="p=0"'.format(file)
    output = subprocess.check_output(
        cmd,
        shell=True, # Let this run in the shell
        stderr=subprocess.STDOUT
    )
    # return round(float(output))  # ugly, but rounds your seconds up or down
    return float(output)

If you want to throw this function into a class and use it in Django (1.8 - 1.11), just change one line and put this function into your class, like so:

def get_duration(file):

to:

def get_duration(self, file):

Note: Using a relative path worked for me locally, but the production server required an absolute path. You can use os.path.abspath(os.path.dirname(file)) to get the path to your video or audio file.

Upvotes: 13

upendra
upendra

Reputation: 349

Python Code

<code>
cmnd = ['/root/bin/ffmpeg',  '-i', videopath]
process = subprocess.Popen(cmnd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdout, stderr = process.communicate()

#This matches regex to get the time in H:M:S format
matches = re.search(r"Duration:\s{1}(?P<hours>\d+?):(?P<minutes>\d+?):(?P<seconds>\d+\.\d+?),", stdout, re.DOTALL).groupdict()
t_hour = matches['hours']
t_min  = matches['minutes']
t_sec  = matches['seconds']

t_hour_sec = int(t_hour) * 3600
t_min_sec = int(t_min) * 60
t_s_sec   = int(round(float(t_sec)))

total_sec = t_hour_sec + t_min_sec + t_s_sec

#This matches1 is to get the frame rate of a video
matches1 = re.search(r'(\d+) fps', stdout)
frame_rate = matches1.group(0) // This will give 20fps
frame_rate = matches1.group(1) //It will give 20

</code>

Upvotes: -1

Zulko
Zulko

Reputation: 3780

I think Chamath's second comment answers the question: you have a strange character somewhere in your script, either because you are using a ` instead of a ' or you have a word with non-english accents, something like this.

As a remark, for what you are doing you can also try MoviePy which parses the ffmpeg output like you do (but maybe in the future I'll use Chamath's ffprobe method it looks cleaner):

import moviepy.editor as mp
duration =  mp.VideoFileClip("my_video.mp4").duration

Upvotes: 2

Related Questions