If you are working on a computer vision project, there is a great chance that you have been recording videos with sound, which you have no use of. To save space and processing power, you can strip the audio from the video just like this:
avconv -i input_video.mp4 -an output_video.mp4
(Replace avconv with ffmpeg if necessary.)
Just so you know, there is something dishonest with avconv as they make you believe ffmpeg is dead or obsolete. In fact it's nothing like that. avconv is a fork of ffmpeg and has become the default on Ubuntu. So if you are reading to use a filter that isn't present in avconv, then you need to download the latest version of ffmpeg from source or from a PPA. Read more on this subject here.
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