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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.
If map options are present, these filtergraph streams are included in addition to the mapped streams.
Complex filtergraph output streams with labeled pads must be mapped once and exactly once.
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.
Therefore, order is important, and you can have the same option on the command line multiple times.It will select that stream based upon the following criteria: is used, only user-mapped streams are included in that output file, with one possible exception for filtergraph outputs described below.If there are any complex filtergraph output streams with unlabeled pads, they will be added to the first output file.The diagram above will, in this case, simplify to this: Since there is no decoding or encoding, it is very fast and there is no quality loss.However, it might not work in some cases because of many factors.