If you have youtube videos (.flv ) in many parts and want to join them as one video then there are several ways to perform this task.The easiest way to join flv videos is to use a software called Avidemux. With Avidemux you open the first part of the video and select Append from the file menu and select all additional parts of the video this way. They will simply get appended to the previous part(s) and you can use the Save video function to save the joined video which contains all parts.
A good indicator that a part was added is to look at the playtime of the video which should increase by about ten minutes for every part that you add to it. The video is saved again as a flv files and the procedure does not take longer than a few seconds if you save them as flv as well.
You could also convert them to avi for instance by assigning the avi file extension to the filename that you want to save.
you have to update windows media player classic or you can download latest version of windows media player classic from www.download.com which can play .flv files
If you have youtube videos (.flv ) in many parts and want to join them as one video then there are several ways to perform this task.The easiest way to join flv videos is to use a software called Avidemux. With 
