ream. As we'll see later on, ffmpeg can process input from several files. "input" is the zero-based index of the input file we want to use − 0 for the first, 1 for the ... rack (boost the volume level among other things), put it back together again, archive the modified program onto a DVD±R and put the DVD+RW back into circulation for the next rec... he stream that'll be used for the video in the output file. The audio stream is mapped to "-map 1:0".
