To upload video to YouTube you need to convert it to a format that is in accordance to YouTube. You have to optimized the video quality and size. Generally the videos recorded from a cell phone or cameras are heavy in size and are not optimized. To do this refining we need to process the video.
To do this we need VLC player, if you do not have it, download it from here. Once installed, run it.
Now go to Media + Convert / Save or Press Ctrl + R
Next select your video file
Click on the File tab.
Press Add... and select video(s).
Selected item(s) will list here.
Press the Small Drop Button.
Select Convert or Press Alt + O
Next select the "Video for YouTube HD" or "Video for YouTube SD" as per your choice.
After selecting the format, select the Destination file using browse... button. Now Press Start and wait for completion. The file will be created at you selected destination and ready to be uploaded to YouTube where your audience desperately awaits.