1 - Open Kastor - Free Video Converter (if necessary you can download it here)
2 - Open the video you want to convert for your Sony Ericsson Xperia X10 by clicking "Add Files" or by dragging and dropping directly in Free Video Converter.
3 - Open the output format list and select MP4
4 - Click on the "Parameters" button to choose the optimal format for your Sony Ericsson Xperia X10
5 - In the parameters window, modify options as below :
6 - Click OK
7 - It's over, you just have to click on Convert to encode the video to the best format for your Sony Ericsson Xperia X10.
8 - And if you're looking for videos for your Sony Ericsson Xperia X10, you can do it with All Video Downloader that downloads videos from over 300 sites !
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