Managing FastAPI Projects with Poetry: A Step-by-Step Guide

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This guide will walk you through how to use Poetry to manage dependencies and structure your project in FastAPI . It includes detailed explanations of Poetry's core concepts and commands to help prevent issues that can arise during team collaboration and deployment. 1. What is Poetry? Poetry is a dependency management and packaging tool for Python. It goes beyond simply installing libraries by allowing you to clearly declare the dependencies your project needs and ensuring that all developers on the project have the same library versions. Clarity in Dependency Management : Explicitly manage your project's basic information and required libraries through the pyproject.toml file. Reproducible Builds : By locking all dependency versions in the poetry.lock file, it fundamentally prevents "it works on my machine" problems. Integrated Development Environment : It automatically creates and manages isolated virtual environments for each project and handles mo...
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FFmpeg] How to Batch Trim MP3 Files Using FFmpeg on Windows

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Introduction: Why Batch Trimming MP3s with FFmpeg Saves Time

If you only need to trim one or two MP3 files—like cutting out an intro or logo sound—online audio trimmers are good enough.
However, if you need to crop dozens or hundreds of MP3 files, using an online tool becomes extremely time-consuming.

That’s where FFmpeg, a free and open-source command-line tool for processing audio and video, comes in. It’s fast, efficient, and works on all major platforms.

Environment

  • OS: Windows 10 Pro x64
  • Tool: FFmpeg full build (version 2022-07-04)

FFmpeg Basics: How to Crop a Single MP3 File

Parameters explained:

  • -i: Input file path
  • -ss: Start time (can include milliseconds)
  • -t: Duration (in seconds)
  • -acodec copy: Copy audio codec (no re-encoding = faster)

Example 1: Trim from 10.123 seconds to end

ffmpeg -i input.mp3 -ss 00:00:10.123 -acodec copy output.mp3

Example 2: Trim from 5 seconds for 5 minutes

ffmpeg -i input.mp3 -ss 00:00:05 -t 300 -acodec copy output.mp3

Batch Processing: Automatically Trim Multiple MP3 Files

To batch crop MP3 files in a folder using FFmpeg on Windows 10, use the following batch script:

Script: batch_trim.bat

@echo off
for /R %cd% %%G in (*.mp3) do (
    ffmpeg.exe -i "%%G" -ss 00:00:04 -acodec copy "%%~nG_cut.mp3"
)

Script Breakdown:

  • for /R %cd% %%G in (*.mp3): Recursively loops through all MP3 files in the current directory
  • %%~nG: Gets the filename without the extension
  • Output files will be named as originalfilename_cut.mp3

✅ Tip: Place this script in the same folder as FFmpeg or ensure FFmpeg is added to your system PATH.

Final Thoughts

Batch trimming MP3s with FFmpeg is:

  • Faster than online tools
  • Customizable for any start time or duration
  • Free and open source

If you're regularly editing podcasts, intros, or background music, automating with FFmpeg will save you hours of manual work.

Location: Calgary, AB, Canada

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