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Encoded packets are then passed to the decoder (unless streamcopy is selected for the stream, see further for a description).The decoder produces uncompressed frames (raw video/PCM audio/...) which can be processed further by filtering (see next section).Anything found on the command line which cannot be interpreted as an option is considered to be an output url.Each input or output url can, in principle, contain any number of streams of different types (video/audio/subtitle/attachment/data).However, it might not work in some cases because of many factors.Applying filters is obviously also impossible, since filters work on uncompressed data.For example using "-nofoo" will set the boolean option with name "foo" to false. A stream specifier is a string generally appended to the option name and separated from it by a colon. stream specifier, which matches the second audio stream.Therefore, it would select the ac3 codec for the second audio stream.
Simple filtergraphs are those that have exactly one input and output, both of the same type.In the above diagram they can be represented by simply inserting an additional step between decoding and encoding: _________ ______________ | | | | | decoded | | encoded data | | frames |\ _ | packets | |_________| \ /