Filter graph

Filter graph

A filter graph is used in multimedia processing. For example to capture video from a webcam. Filters take input, process it or change the input, and then output the process data. An example of a filter, would be a video codec that takes raw uncompressed video and compresses it using a video standard such as H.264. To compress a multimedia stream a filter graph could have two inputs:
# Audio
# VideoUsually these are expressed as file sources. The file sources would feed compression filters, the output of the compression filters would be feed to a multiplexer that would combine the two inputs and produce a single output. An example of a multiplexer would be an MPEG transport stream creator. Finally the multiplexer output would be fed to a file sink, which would create a file from the output.

A filter graph in multimedia processing is a directed graph. Edges represent one way data flow and nodes represent a data processing step. The term pins or pads are used to describe the connection point between nodes and edges.

Example of programs that use filter graphs

* GStreamer - Linux based multimedia framework. In Gstreamer a filter is called an element. Filter graphs can be built with the [ GStreamer Editor] .
* GraphEdit - Microsoft tool for building filter graphs
* DirectShow - Windows based multimedia framework.
* [ GraphEditPlus] - another tool for building DirectShow filter graphs and generating C++ source code for them.

ee also

Explanation of filter graph in DirectShow article: DirectShow#Architecture

External links


* [ Explanation of filter graph manager] []
* [ Filters what they are]
* [ Example of filter graph usage]
* [ Data Flow in the Filter Graph]

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