Mencoder is included in the Mplayer package, it's not a separate program. And can be used to encode or transform any audio or video stream that MPlayer can read.

Step 1. Install MenCoder and MPlayer

CentOS/RHEL and Fedora users, make sure that you have enabled ATrpms repository in the system. Let’s begin installing MPlayer & Mencoder as per your operating system.

For CentOS/RHEL and Fedora:

# yum install mencoder
For Ubuntu and Debian:

$ sudo apt-get update
$ sudo apt-get install mencoder

Step 2. Check Audio/Video Codes

After successfully installing Mencoder, let’s check the available audio/video codes

Video Codecs:
$ mencoder -ovc help

MEncoder svn r34540 (Ubuntu), built with gcc-4.6 (C) 2000-2012 MPlayer Team

Available codecs:
   copy     - frame copy, without re-encoding. Doesn't work with filters.
   frameno  - special audio-only file for 3-pass encoding, see DOCS.
   raw      - uncompressed video. Use fourcc option to set format explicitly.
   nuv      - nuppel video
   lavc     - libavcodec codecs - best quality!
   vfw      - VfW DLLs, read DOCS/HTML/en/encoding-guide.html.
   qtvideo  - QuickTime DLLs, currently only SVQ1/3 are supported.
   xvid     - XviD encoding
   x264     - H.264 encoding
Audio Codecs:
$ mencoder -oac help
MEncoder svn r34540 (Ubuntu), built with gcc-4.6 (C) 2000-2012 MPlayer Team

Available codecs:
   copy     - frame copy, without re-encoding (useful for AC3)
   pcm      - uncompressed PCM audio
   mp3lame  - cbr/abr/vbr MP3 using libmp3lame
   lavc     - FFmpeg audio encoder (MP2, AC3, ...)

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