-map 0 From input index #0 (the 1st input) select all streams.map 1:a:2 refers to "second input:audio only:third audio stream". The bottom command includes stream specifiers ( v for video, a for audio) to limit the streams to a specific type.
map 1:3 refers to "second input:fourth stream".
This is an absolute method of mapping and will choose a specific stream regardless of type. The top command does not use any stream specifiers.The commands do the same thing, but use different syntax to map streams: The commands in the diagram above will select the video from input0.mp4 and the 3rd audio stream from input1.mkv to output.mp4. The -map option can also be used to exclude specific streams with negative mapping. The -map option is used to choose which streams from the input(s) should be included in the output(s).
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