Try 'SUPER'. It is a encoder as well as e editor and for free.. http://www.erightsoft.com/SUPER.html
RMVB is quite an outdated format. If you want to change your RMVB videos to AVI or MPEG files, you can try some video converters like the Free HD Video Converter Factory, or use the VLC media player to play/convert files. These are the easiest programs to transfer your RMVB files.
You don't need to buy an RMVB player, you can download RealPlayer for free and play the files using RealPlayer.
You can get an encoder online at Microsoft's website. There is a free version you can get and also a version of Microsoft Expression Encoder that you may buy.
The acronym stands for RealMedia Variable Bitrate (RMVB) which means you can play the file if you download Real Player. Search for the website to get the free download through Google.
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I uaually convert rmvb to DVD. The article in the related link will give all of you a step-by-step introduction about how to convert rmvb to DVD.
The easiest way to open an RMVB file is to download and install RealPlayer.
A LAME MP3 encoder is a tool that is used to teach others about MP3 encoding. One can view the official LAME website for further information on the encoder and what it is best used for.
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A shaft encoder is also known as a rotary encoder. The shaft encoder converts an angular position of a shaft to a digital code.
You do not mention what do you need to convert your mp3s from, but luckily there are enough all-round converters out there. You can use Free MP3 WMA Converter, Switch Audio File Converter, BonkEnc Audio Encoder or Free MP3/WMA/OGG Converter; which are all free!
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