,
das kannst Du mit dem -map Switch festlegen, welche Tonspur kodiert werden soll.
Laut Man-Page:
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-map file:stre... is the number of the stream within this file that we want to use, also zero-based. "-map 0:3" therefore means that we want to use the fourth stream in the first (and o... ds finishing now that I think of it). This is how we use solution 2:
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$ ffmpeg -i oldmovie.vob