audio stream, #0.3. If I don't tell ffmpeg which one to use, it'll go ahead and transcode the first one it finds, the DTS stream in this case. I don't w... g to process the given stream. As we'll see later on, ffmpeg can process input from several files. "in... e want to use the fourth stream in the first (and only, in this case) input file.
"-map" can also be... es the stream to use for the video and the second one specifies which stream to use for the audio:
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