Getting started in Video can be very frustrating and confusing. A frequent problem when trying to upload a video to YouTube is that it is not in an accepted file format. Below are the instructions directly from YouTube.
---------------------------------------------------------------------------------------------------------------------
Once you've finished editing your video, made sure it's less than 10 minutes, smaller than 1GB in size, and in an acceptable format, you're ready to upload it.
- Click the "Upload" button in the upper-right-hand corner of any YouTube page.
- Enter as much information about your video as possible, including Title, Description, Tags, and Category. The more information you include, the easier it is for users to find your video!
- Determine if you want your video set to Public or Private.
- Click the "Upload a Video..." button.
- In the next window, click the "Browse" button to browse for the video file. Select the file you want to upload.
- Click the "Upload Video" button.
It can take from a couple minutes to an hour for your video to upload to YouTube.
If you're receiving an error with your Upload, you might want to make sure you're attempting to upload a file that's recognized by YouTube. YouTube accepts video files from most digital cameras and camcorders, and cell phones in the .AVI, .MOV, .WMV, and .MPG file formats.
----------------------------------------------------------------------------------------------------------------------
This can still be very confusing though. The most common problem is not having the right type of file.If you can't see your file type then you need to change how your files are displayed.

Change to details.

The file extension is the portion after the period.
There are a number of online sites that will convert your files for free. Both limit the total file size to 100 megs.
http://mediaconverter.org/index.php
free files up to 100 megs
http://online.movavi.com/
free up to 100 megs
Hi and welcome to Active Rain, a great site to network, share, learn and have fun.
Good luck