More modern applications are sometimes capable of using DirectShow for decoding, but they usually still require VFW and ACM codecs for encoding. Traditional video editing applications are not able to use DirectShow. These two types of codecs are required by most video editing applications, such as VirtualDub. Components for these system are called codecs, because they are typically able to both encode and decode. Two other systems are VFW (Video For Windows) and ACM (Audio Compression Manager). By this definition, a DirectShow filter is not a codec. The filters in the K-Lite Codec Pack are carefully selected to provide you with optimal functionality and a minimal chance of running into problems.Ĭodec is short for Compressor- decompressor, which is a piece of software that is able to decode and encode a certain format. If something goes wrong it is simply because some filters in the graph are not performing their subtasks correctly. It is a myth that filters can conflict with each other. If no suitable DirectShow filter can be found to decode a certain audio or video format, then DirectShow is able to fall back to using VFW (Video For Windows) and ACM (Audio Compression Manager) codecs (see below) through special wrapper filters. Advanced players are often able to manipulate which filters are used in the graph, allowing for example to block or prefer certain filters. Tools exist to alter the merit of a DirectShow filter. The merit of a filter is simply a numerical value that indicates the preferability of the filter. During graph creation, if DirectShow finds multiple filters that are able to perform the same subtask, then it will typically select the filter that has the highest merit. A source filter is responsible for reading the file format and feeding the data to the other filters downstream in the graph. Typical elements in the graph are a source filter (splitter) and decoders for the audio and video. Each filter in the graph performs a subtask of the whole process. During playback data flows from the root to the leaves. It’s just like a tree: a file is a root of the graph and the audio and video renderers are the leaves of the graph. DirectShow is a system that uses multiple DirectShow filters as building blocks to construct what is called a DirectShow graph. Expand all answers, or click on the question to view the answer.Īnswer: Most players use DirectShow for playback.
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