Introduced so much, the following is also an example, using filter to achieve wide and high halved display:įfplay.exe sample.rmvb -vf scale=iw/2:ih/2 In addition to source and sink filters, other filters have at least one input and at least one output.
The other is divided according to the location of the codec: In the field of telecommunications engineering, filter usually refers to devices used for signal processing, such as low-pass filters, high-pass filters, band-pass filters, denoising filters, etc., which are typical for audio processing.Īccording to the type of data processed, usually the multimedia filter is divided into:.For example, grep under Linux can be thought of as a filter, matching selections according to regular expressions, and selecting output data from input. Usually the filter itself does not do any input/output. In other words, filter is a pass-through block of code that transforms and outputs input data. In a computer program, a filter is a piece of code that can be used to check input or output and process and pass the data according to predetermined rules.Physically, common filters are duplicated with purifier concepts, such as water filters, air purifiers, and so on. Detailed documentation can refer to FFmpeg filter。 What is the filter in the traditional concept?įilter can be translated into filters, filters. In order to unify the filter library API interface, FFmpeg proposed a high-quality, efficient and flexible audio and video filter interface with reference to DirectDraw. Many different multimedia projects (such as MPlayer, Xine, GStreamer, etc.) implement a custom filter system.
However, audio and video filters do not have similar standards. The libavcodec interface defined by FFmpeg has become the de facto industry standard in the field of codec. The filter itself is a plug-in form that can quickly assemble the desired effect.įor example, the following filter can achieve horizontal mirroring of video.įfplay.exe sample.rmvb -vf hflip Why does FFmpeg redefine the filter API? Libavfilter in FFmpeg provides a complete set of filter-based mechanisms.
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