Problem Formulation: Given a video file. How to get its duration in seconds using Python code?
The video can have any of the following video formats:
Method 1: Using Subprocess + ffprobe
Within your Python shell, you can run any external command with the module subprocess. The external tool ffprobe helps you determine many video statistics such as the length of the video.
“ffprobe gathers information from multimedia streams and prints it in human- and machine-readable fashion.”
import subprocess def get_length(filename): result = subprocess.run(["ffprobe", "-v", "error", "-show_entries", "format=duration", "-of", "default=noprint_wrappers=1:nokey=1", filename], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) return float(result.stdout)
You can download ffprobe for Windows, macOS, and Linux here.
Method 2: Using the moviepy Module
This code is even more concise—and it retrieves the duration of a given video very quickly using the
from moviepy.editor import VideoFileClip clip = VideoFileClip("my_video.mp4") print(clip.duration)
This code is obtained from here. However, it is reported that method 1 with
ffprobe is 10x faster than the method with
Method 3: Using the pymediainfo Module
An alternative to the previous method is provided by the
from pymediainfo import MediaInfo clip_info = MediaInfo.parse('my_video.mov') duration_ms = clip_info.tracks.duration
Method 4: Using the opencv Module
One of the fastest method to retrieve the duration of a video is provided by the
import cv2 video = cv2.VideoCapture('my_video.webm') duration = video.get(cv2.CAP_PROP_POS_MSEC)
Where to Go From Here?
Enough theory, let’s get some practice!
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While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students.
To help students reach higher levels of Python success, he founded the programming education website Finxter.com. He’s author of the popular programming book Python One-Liners (NoStarch 2020), coauthor of the Coffee Break Python series of self-published books, computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide.
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