mencoder

Convert video

$ mencoder [input.avi] -o [output.mp4] -ovc lavc -oac mp3lame

$ mencoder [video.avi] -o [audio.mp3] -ovc copy -oac mp3lame

$ mencoder [input.avi] -o [output.avi] -vf scale=[640:480] -ovc lavc -oac copy

$ mencoder [input.avi] -o /dev/null -ovc lavc -lavcopts vpass=1 && mencoder [input.avi] -o [output.avi] -ovc lavc -lavcopts vpass=2

$ mencoder -ovc copy -oac copy -o [joined.avi] [file1.avi] [file2.avi]

mencoder [options] input -o output

mencoder encodes video from MPlayer. It converts between formats and applies filters.
The tool is part of MPlayer project. Superseded by FFmpeg in many cases.

INPUT

Input media file.

Output file.

Video codec.

Audio codec.

Video filters.

Display help information.

MPlayer project (legacy). FFmpeg often preferred. Complex options.

mencoder was the encoding companion to MPlayer, providing video conversion capabilities.

ffmpeg(1), mplayer(1), handbrake(1)