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"there is something wrong"? Seriously? That's all you're going to tell us?
How about letting us know what editing software you're using? Or what format you are converting from what what format you are converting to? Or how about telling exactly what exactly is wrong?
A general rule is to learn the characteristics of the target video that you require. If it is for a device, it may have constraints beyond the limits or capabilities of the format.
Learn the difference between a container format (e.g. avi, mpg) and a codec (e.g. xvid, mpeg2video, mpegts, etc).
The format of the source video isn't as important. Most conversion programs will recognize the video (reading the metadata) and you don't need to enter parameters describing the source. There are exceptions.
A google search on the device (or web service) you are converting the video for should provide you with details on the video it will display.
You may need to resize the video, bring down the bit rate, change the display rate (e.g. from 60 fps to 25 fps).
You will need to provide more information on the requirements for the target video before anyone can provide particular advice.
The good news is that once you have a target that works, you don't need to change it. Then even using ffmpeg for the conversion is easy. A simple one line script in ~/bin/ can simply take the filename of the source as an argument. The arguments to the command are in the script. A script I wrote to convert video to a format for my Samsung YP-P2 requires just the filename.
Running "vid2p2 avideo.mov" is quicker and easier for me than starting a gui conversion program and entering the parameters each time. The hard work is learning which parameters are required, and this needs to be done for both ffmpeg and a graphical tool.
Some graphical programs allow loading presets. Once you have all of the settings the way they need to be, you may be able to save them to a file, making it easier to use on the next video. The settings may be spread on several tabs, making a gui interface no quicker. Especially if generic settings for an output format aren't adequate.
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