Adding audio into video

Tip picked up from this Ask Ubuntu post. Note that the text below is not verbatim:

ffmpeg -i video.mp4 -i audio.aac -map 0:0 -map 1:0 -vcodec copy \
   -acodec copy newvideo.mp4

ffmpeg -i video.mp4 -i audio.aac -map 0:1 -map 1:0 -vcodec copy \
   -acodec copy newvideo.mp4

   -i video.mp4  -> first media file
   -i audio.aac  -> second media file
   -map 0:1      -> use the second stream from the first mediafile
   -map 1:0      -> use the first stream from the second mediafile
   -vcodec copy  -> leave the video as is
   -acodec copy  -> leave the audio as is
   newvideo      -> resulting videofile

   Use 'mediainfo' to confirm that the audiofile and videofile have the same
   duration.  Not every player is accepting tracks with huge duration

Mass changing tags

Out of the many alternatives I've settled on:

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