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The decoder produces uncompressed frames (raw video/PCM audio/...) which can be processed further by filtering (see next section).
After filtering, the frames are passed to the encoder, which encodes them and outputs encoded packets.
Selecting which streams from which inputs will go into which output is either done automatically or with the refers to the fourth stream in the third input file. As a general rule, options are applied to the next specified file.
Therefore, order is important, and you can have the same option on the command line multiple times.
Each occurrence is then applied to the next input or output file.
Exceptions from this rule are the global options (e.g. Do not mix input and output files – first specify all input files, then all output files.
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.
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.is a very fast video and audio converter that can also grab from a live audio/video source.It can also convert between arbitrary sample rates and resize video on the fly with a high quality polyphase filter.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.