How can I edit video frames & join those avi files? M unable 2 join avi files bcoz 1 file's frames is diffrent?

-If you are using Linux (ubuntu), you can do these all these things according to your requirements. Just install ffmpeg and edit your videos in all types.

you can change format of files.

you can edit, resolution, bit rate, frame rate, audio quality, video quality.

You can cut files as well as join them.

FFMPEG is the best solution of all video problems.I'd like to recommend video joiner to you, I always use it to merge video and make funny video for uploading to Youtube, it's easy to use and the quality is awesome, you can crop, cut, join, edit video with it easily. that's pretty cool. It worth a try. Here is the free download link.

And here is a step by step guide about how to use it

http://www.flash-video-soft.com/joiner/

Hope it helps. Contact me if you have any other question.