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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 | |_________| \ /||______________| \ __________ / simple _\|| | / encoder filtergraph | filtered |/ | frames | |__________| filter, which only sets timestamps and otherwise passes the frames unchanged.
Therefore, order is important, and you can have the same option on the command line multiple times.Stream handling is independent of stream selection, with an exception for subtitles described below.Stream handling is set via the option is specified for a stream type, ffmpeg will select the default encoder registered by the output file muxer. If a subtitle encoder is specified for an output file, the first subtitle stream found of any type, text or image, will be included.Finally those are passed to the muxer, which writes the encoded packets to the output file.Before encoding, distinguishes between two types of filtergraphs: simple and complex.This will lead to a fatal error if the stream type is not supported by the output format.
In the absence of the map option, the inclusion of these streams leads to the automatic stream selection of their types being skipped.
The sub-sections that follow describe the various rules that are involved in stream selection.
The examples that follow next show how these rules are applied in practice.
Also do not mix options which belong to different files.
All options apply ONLY to the next input or output file and are reset between files.
option, and writes to an arbitrary number of output "files", which are specified by a plain output url.