This simple interface hyper fast video and audio encoder - FFmpeg (http://ffmpeg.org/)
FFmpeg is already built into the program and does not require download of additional codec.
Main purpose: to convert any video to mp4 or 3gp, understandable to Android devices and resize under the screen resolution of devices. You can also extract the mp3 audio from the video.
Supports: MPEG4, h264, mp3, aac, ogg (vorbis and theora) and many other formats (the list can be found in the program). Optipization for x86 и ARMv7(cortex-a8).
Requirements: Processor ARMv7 and above or x86.
Built-in: FFmpeg v2.3 + libx264 + libmp3lame + libvorbis + libtheora + libfaac + libvpx
More options you will find in FFmpeg's man pages.