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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. Regards!
If you're using Windows Movie Maker, it's possible you're trying to upload your .MSWMM file. This is not an actual movie file. An .MSWMM file is a Windows Movie Maker project file. If you're satisfied with your movie, choose the 'Publish Movie' or 'Save Movie File' option (depending on which version you have) under the 'File' menu and create a movie file such as .avi or .wmv.

Mac MKV Converter, a professional conversion tool running on mac os x, can convert mkv with excellent output quality and fast speed.

Once you've finished editing your video, made sure it's less than 10 minutes, smaller than 2GB 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.
- Click the "Browse" button to browse for the video file you'd like to upload to our site. Select the file you want to upload.
- Click the 'Upload Video' button to start the uploading process.
- As the video file is uploading, enter as much information about your video as possible in the relevant fields (including Title, Description, Tags, and Category). You're not required to provide specific information, but the more information you include, the easier it is for users to find your video!

HD Video Converter can easily convert HD video formats such as AVCHD (mts, m2ts), H.264/AVC, MKV, MPEG-2 (ts), DivX, HD WMV, MPEG-4 and Quick Time.

- Click the 'Save changes' button to save the updates you've made to the video file.
It can take from a couple minutes to an hour for your video to upload to YouTube.
Source(s):
YouTube Help!
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it is the best YouTube FLV converter which can convert video files at super fast speed and best video quality. It can convert all popular video file into YouTube FLV video format such as converting AVI, WMV, MKV, MP4, MPG, TS, etc.

Understand different codecs of AVI files and choose the best dvd ripper when you have the need to convert DVD to AVI.

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