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Month: September 2017

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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Depthmapping with FFMpeg and OpenCV

Depthmapping with FFMpeg and OpenCV

Depthmaps are typically greyscale images that represent how far an object is by the degree of shade. They can be white-near, black-near, or some other color scale such as ironbar. Depthmaps are useful for creating renders or systems that have a distance sensing need. In this post I’ll be using footage that I shot using 2 Innovv cameras. The rig was not precise, so I also post processed it to correct distortion and alignment issues. The post processing topic was…

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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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