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Some terms used in the area of Audio/Video and there meaning.

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===[[Aspect Ratio]]===
The ratio of width to height of a video
===[[bitrate]]===
The number of bits of data to be played per second.
===[[Chroma]]===
===[[codec]]===
A part of the program which understands a type of video or audio.
===[[Decode]]===
To understand and play a file, VideoLAN needs to decode it. It does this with a decoder.
===[[Deinterlacing]]===
===[[Demuxing]]===
===[[Encode]]===
===[[MPEG-ES|ES]]===
An elementry stream, a single channel of audio, video or subtitles (without a container).
===[[FourCC]]===
===[[framerate]]===
The number of frames of video displayed (or encoded to be displayed) per second.
===[[IDCT]]===
===[[Motion Compensation]]===
===[[Muxing]]===
===[[Overlay]]===
Displaying an image on top of the video
===[[Packetizing]]===
===[[Post Processing]]===
===[[PCR]]===
===[[MPEG-PS|PS]]===
===[[PTS]]===
===[[Sample rate]]===
===[[Transcode]]===
Transcoding is changing the format of a file.