title: Converting video formats and copying tags with ffmpeg
body: <p>I've been trying to convert some videos I took on my camera to a compressed format in order to save some storage space. I figured out how to use ffmpeg to convert the videos to the format I want, but what I haven't been able to figure out is how to copy the metadata. I'd like to copy the original metadata from when the video was taken (most importantly the creation time).  I've tried running ffmpeg using the -map_meta_data 0:0 option, but that didn't seem to work.  Any ideas?</p>
  
  <p>It looks like the data I want to copy in this case is in the format section of the video. Using ffprobe with the show_format option, I get this output:</p>
  
  <pre><code>[FORMAT]
  filename=video.AVI
  nb_streams=2
  format_name=avi
  format_long_name=AVI format
  start_time=0.000000
  duration=124.565421
  size=237722700
  bit_rate=15267331
  TAG:creation_time=2012-02-07 12:15:27
  TAG:encoder=CanonMVI06
  [/FORMAT]
  </code></pre>
  
  <p>I would like to copy the two tags to my new video.</p>