Example of using Windows Media Player (under Windows 7) to drop video play speed by 2.
1. For an example video, download a random Youtube video, such as
https://www.youtube.com/watch?v=MbfRRXHqLm8 which happens to be Michael Wiess's "Ice Skating - How to Perform the Six Basic Jumps" video.
If you don't have a way to do that, try:
A. Make sure you have Java and Firefox installed:
http://java.com/en/download/ -> "Free Java Download"
B. Go into the Firefox browser:
C. Change the video address, by adding an "ss" in front of "youtube" to get
https://www.ssyoutube.com/watch?v=MbfRRXHqLm8 Type that into the address bar, and hit enter.
D. Wait a minute or two until a set of "Download links" labeled
FLV 240p
MP4 360p
WebM 360p
3GP 144p
3GP 240p
Audio MP4 128
appears.
Click on "MP4 360p", the highest res common format choice available.
Chose to "save" the result rather than go directly into Media Player.
Open the download folder, by clicking on "My Computer" or other folder, and navigate to
c:\Users\<my user name>\Downloads
where the video appears as file
"Ice Skating - How to Perform the Six Basic Jumps.mp4"
2. Open that file with Windows Media Player
(Right click on that the video file -> "Open With" -> "Windows Media Player".)
3. It starts to play at normal speed. Pause the video (click on two highlighted parallel vertical lines), click on the little box at the upper right hand corner of the window to make it full screen, right click in the window, select
Enhancements -> Play speed Settings.
Move the bar to ".5", Right click on the "x" to kill the settings window, and click the Play (Highlighted blue right-arrow).
It plays at half speed. Michael Wiess sounds a bit weird, and the video isn't perfectly smooth, but you are being much too picky.
You can now notice some of the details of these jumps
I'm sure some of the other apps can slow things down by more than a factor of 2, and maybe with fewer artifacts, but this gives you the general idea.