How can I duplicate a non-audio / video data stream from the input MP4 file using FFmpeg?

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To duplicate a non-audio/video data stream from the input MP4 file using FFmpeg, you can use the -map option to specify the input stream and the -codec copy option to copy the stream without any re-encoding.

For example, if you want to duplicate stream 1 from the input file input.mp4, you can use the following command:

ffmpeg -i input.mp4 -map 0:1 -codec copy output.mp4

This command will copy stream 1 from the input file and save it to output.mp4 without any re-encoding.

Note that the -map option specifies the input stream using the format input_file:stream_specifier, where the input_file is the input file and the stream_specifier specifies which stream to use. The stream specifier can be a number (such as 1 for stream 1), a name (such as subtitle), or a type (such as v for video or a for audio).