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Slow down a video “mencoder”, “ffmpeg” and “sox”

Today we still talk about video editing command line, ffmpeg as well as we will see in broad terms how they work mencoder and sox: is the first part of the project “mplayer“, the second helps us in definition audio. The end result of this tutorial will be the original video (including audio) slowed. In short will last twice.

To begin with we must have a video format “mp4“. If we use our size differs ffmpeg by convertirlo. (more…)

Changing the pitch of an audio file with Audacity

In today's tutorial we begin to delve into the world of digital audio. Let's start with a simple solution of the problem, problem that many people will ever encounter. How to change the pitch of a file (or of a part of file) lossless audio? The answer is “can not”. To change the pitch you need a small (laughable) loss of information, imperceptible, but it is better to know.

For this tutorial we will use the open source audio editor Audacity, and we will use this audio file.

First of all open Audacity and import the file: “File” – “Import” – “Audio”. (more…)