Download FFmpeg for Windows 10/8/7 64-bit/32-bit. Get popular alternatives free software, freeware, trial and update.
If it does your good to go, try downloading and converting a video. Download latest Video Tools apps free and safe from Autotech. For example mine was something like this: /Users/ME/Desktop/ffmpeg-0.5/libavformat once thats typed in the red lettering should turn to black. In this tab you should not close it thinking that it is a Popup It is thanks to this page that you could download Ffmpeg (without it you cannot convert to MP3). I opened up Spotlight (top right-hand corner of mac) and typed in what was mentioned above "which ffmpeg" the top file it highlighted said "utils.c-libavformat" put your mouse over it and it should show a little screen that tells you the Path. geasemonkey plugin for firefox can do this but they come down as MPG (not avi) files. In the blank field, type C:ffmpegbin and click on the Ok button. Now I tried downloading a video from youtube just so I could get the downloader helper preferences up to the screen where it asks for the path of the converter (ffmpeg). Go to the Advanced tab and click on the Environment Variables button. Then double click the folder called libavcodec, if it doesn't do anything in Terminal then thats ok.
Months ago, I updated my NVIDIA graphics driver while watching a YouTube. Videos can be converted automatically using ffmpeg. GPU hang occurred when hw accelerated decoding is issued by ffmpeg and video. It grabs video streams while browsing with firefox (only linux).
Download the file that was posted, open the folder and double click on the configure icon, once it does its thing go back to the folder screen scroll down and open the folder called ffpresets, this should do something in the terminal program that was opened after clicking the Configure icon. Mediadownloader is an opensource software that lets you search, watch and download items with Google Image and YouTube.