Hello,
Thank you for contacting Microsoft Community.
From the issue description, I understand that you want to know how you got “ffdshow” audio decoder and “Lav Splitter” installed in your PC.
Be assured that we are here to help you with your concern.
ffdshow is a codec mainly used for decoding of video in the MPEG-4 and H.264/MPEG-4 AVC video formats, it supports other video and audio formats.
LAV Splitter is a multi-format media splitter for DirectShow. It is based on ffmpeg and libbluray and is aimed to offer an all-around solution to perfect playback of file-based Media as well as blu-rays.
If you do not want to use the above programs then you may refer the below link to uninstall the programs,
Uninstall, change or repair a program
http://windows.microsoft.com/en-us/windows-8/uninstall-change-program
Hope the above information was helpful, kindly get back to us if you need any further assistance.