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Category: Raspberry Pi

SoX – An Introduction

SoX – An Introduction

SoX, short for Sound eXchange, is a command line utility that can convert audio data into other formats. It can also apply various effects, play, record, mix, and filter the audio data. Refer to the development website, http://sox.sourceforge.net/. In a previous post I used it to create a spectrogram of an audio file using this command. sox audio-in.wav -n spectrogram Lets start with basic play operation. SoX can play audio data through the command line using the play command, here…

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Spectrograms with FFMpeg

Spectrograms with FFMpeg

In this post I’ll be covering how to create image files that represent the sound levels and frequencies of a media file.  These images are known as spectrograms.  They provide a way to visually locate moments in time.  This can be useful for a number of reasons. FFMpeg has a feature that lets us create spectrograms with the showspectrumpic filter.  Details about this filter can be found here, https://ffmpeg.org/ffmpeg-filters.html#showspectrumpic.  You can also get information about the filter by typing in…

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Creating Anaglyph Video with FFMpeg

Creating Anaglyph Video with FFMpeg

In this post, we’ll step through how to create anaglyphic stereoscopic videos using FFMpeg. To create anaglyph imaging, we’ll need to use two camera sources, one left, the other right. These sources will be merged into a single image with red cyan overlaying to create a three dimensional effect using red cyan glasses. I referenced these sites frequently. FFMpeg Documentation – https://ffmpeg.org/documentation.html FFMpeg Stereoscopic Details – https://trac.ffmpeg.org/wiki/Stereoscopic The source video I’ll be demonstrating was shot with two Innovv C1 dashboard…

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