Increase video volume using ffmpeg
Sometimes recorded video, screecasts etc have a low volume, if you want to increase the volume without getting into too much complication, you can simply use ffmpeg for the same.
ffmpeg -i foo.mp4 -filter:a "volume=5.0" foo-high-volumet.mp4
ffmpeg is the command
-i assigns input file i.e. foo.mp4
-filter: for audio filter
volume-x used to specify the volume
Lastly the file name to which the output is to be stored.