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• Bash : FFmpeg : Automate Album Art Tagging

  8 septembre 2021, par Brett Sjoholm

  Every one of my music folders are set up like Artist > Year Album >

  


  Track 01.flac
Track 02.flac
Track 03.flac
folder.jpg, jpeg, png, etc


  


  And what I need to do is if folder.* is available.

  


  if [ -f folder.* ]; then


  


  Run this command to set smaller size without replacing the original photo.

  


  for small in folder.*
convert $small -resize 1000x1000 temp$small


  


  Then run these commands on every file to automatically add the smaller sized cover to each audio file's tagging.

  


  ffmpeg -i TRACK.flac -i SMALLFOLDER.* -map a -map 1:v -disposition:v attached_pic -metadata:s:v comment="Cover (Front)" -codec copy TRACKWITHART.flac
&& rm TRACK.flac
&& mv TRACKWITHART.flac TRACK.flac
&& rm temp$small


  


  Last little bit there is me cleaning up. I'm having trouble piping commands into one another with this and not the most experienced with that sort of thing.

  


  And also, if it's not available like above, will need to extract it from the first audio file by finding it.

  


  else
find . -name "*.flac" -print -quit 


  


  And extracting it with this command.

  


  ffmpeg -i TRACK.flac -vf scale=1000:1000 -an FOLDER.png


  


  Then run the other commands above.

  


  Now I don't know if anyone is familiar with FFmpeg but it's actually kind of nightmare because it's not necessarily for audio tagging but I don't know anything else to handle this kind of automated album art task in the terminal. If anyone can point me more in the right direction with a better CLI utility, that'd be awesome or just help with this bash scripting. You can see I'm fairly familiar with the terminal and getting some things done by searching the web but putting them altogether in a bash script is very difficult for me to understand, if anyone has some links for specifically this, that would be much appreciated.

  


• How to create music video using ffmpeg ?

  17 juin 2020, par Pierre Dunn

  How can I join together flac or wav file with a cover image (not only as a thumbnail, but also as a static image for all video duration) ?

  



  How to achieve the best audio quality ? Should I use 48 kHz or 44.1 kHz frequencies for my audio ?

  



  Should I tag my audio files before converting them to WebM ?

  


• How to create an animated GIF using FFMPEG with an interval ?

  26 octobre 2014, par Jeff Wilbert

  Hello fellow overflowers,

  A brief overview of what I’m trying to accomplish ; I have a site that will accept video uploads, uploads get converted into the mp4 format to be uniformed and playable on the web using one of the many available players. That part is all fine and dandy.

  The problem now is I want to show the user a short scaled preview (animated gif) of the video before they click to play it. The code I’m working with now is

  ffmpeg -i test.mp4 -vf scale=150:-1 -t 10 -r 1 test.gif

  Which works for creating a scaled animated gif with a fixed width of 150px at a rate of 1 frame per second but its only an animation of the first 10 seconds of the video. I’m trying to do something that spreads out the frame gap to cover the whole video length but create an animated gift that’s no more then 10 seconds long.

  For example say I have a video that’s 30 seconds I want the gif to be 10 seconds long but cover frames of the entire 30 seconds so it might start at frame 3 or 3 seconds in and create a frame in the gif, then at 6 seconds in the video create another frame, then 9 seconds in another, and so forth where the final outcome is

      example video 30 seconds long          example video 1 minute 45 second long 
  
  
  
  video position - gif frame/per second      video position - gif frame/per second
  
        00:03:00   1                               00:10:50   1
  
        00:06:00   2                               00:21:00   2
  
        00:09:00   3                               00:31:50   3
  
        00:12:00   4                               00:42:00   4
  
        00:15:00   5                               00:52:50   5
  
        00:18:00   6                               01:03:00   6
  
        00:21:00   7                               01:13:50   7
  
        00:24:00   8                               01:24:00   8
  
        00:27:00   9                               01:34:50   9
  
        00:30:00   10                              01:45:00   10
  
  
  
    3 second interval between frames         10.5 second interval between frames

  Where you end up with an animated gif that’s 10 seconds long showing a preview of the entire video no matter the length of it. Which basically just boils down to
  video length / 10 (length of desired animated gif) = interval to use between frames but I don’t know how I can use that data to accomplish my problem...

  So does anyone have an idea or suggestion on how this can be accomplished with relative ease ? I can probably do it by calculating the length through code and running a command to extract each individual frame from the video that’s needed then generate a gif from the images but I’d like to be able to do it all with just one command. Thanks.