y from the third 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, th... ab 96k -ac 1 mr.mp3
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"-map input:stream" tells ffmpeg to process the given stream. As we'll see later on, ffmpeg can process input from sever... the case with my DVD recorder, in which case you'll need "-map 0:1" instead. Either way round, this is the stream that'll be used for the video in the output file. The aud
