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G
Garbage In Garbage Out, GIGO

GOP, Group Of Pictures
GUI



G
Garbage In Garbage Out, GIGO
Garbage In, Garbage Out or sometimes called Crap In, Crap Out is a computer term describing the fact that the output data is only as good as the input data. It means basicly the same as a video term, the output video and audio quality can only be as good as the source video and audio quality.




GOP, Group Of Pictures
A Group Of Pictures (GOP) consists of all the pictures that follow a GOP header before another GOP header.
The GOP layer allows random access because the first picture after the GOP header is an Intra picture that means that it doesn't need any reference to any other picture.
The GOP layer is optional, i.e. it's not mandatory to put any GOP header in the bitstream.
In the header there is also the timecode of the first picture of the GOP to be displayed.

The decoding process, as the GOP header is immediately followed by an Intra picture, can begin at that point of the bitstream. Anyway it's possible that some B pictures, following such I_picture in the bitstream, have references coming from the previous GOP and can't be correctly decoded.
In this case the GOP is called an Open GOP because some references from the previous GOP exist; if a random access to such a GOP is performed, some B_pictures shouldn't be displayed .
A GOP is called a Closed GOP when either there are no B_pictures immediately following the first I_picture or such B_pictures haven't any references coming from the previous GOP (in this case a GOP header flag must be set).

In the "coding people" language the GOP length is the period (often expressed in frames) by which an Intra frame occurs. It must be noticed that such a value cannot be found in the bitstream and it is unnecessary to the decoding process. Furthermore it isn't specified any fixed period for the Intra frame. As the presence of the Intra frames is quite important for many applications, it is the encoder that has to provide them, while the decoder has only to work with all the valid bitstreams.




GUI
A GUI (usually pronounced GOO-ee) is a Graphical User Interface to a computer. As you read this, you are looking at the GUI or graphical user interface of your particular Web browser. The term came into existence because the first interactive user interfaces to computers were not graphical; they were text-and-keyboard oriented and usually consisted of commands you had to remember and computer responses that were infamously brief. The command interface of the DOS operating system (which you can still get to from your Windows operating system) is an example of the typical user-computer interface before GUIs arrived. An intermediate step in user interfaces between the command line interface and the GUI was the non-graphical menu-based interface, which let you interact by using a mouse rather than by having to type in keyboard commands. http://searchwebservices.techtarget.com/sDefinition/0,,sid26_gci213989,00.html










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