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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.

  


• ffmpeg - extract exact number of frames from video

  29 mars 2017, par Michael B

  I want to create a maximum of 30 images from a video (and tile them for a sprite sheet).

  I’ve tried using the ’select’ with ’mod’ but if the total number of frames does not fit neatly into the desired number of images (30) then I sometimes end up with more images, sometimes less.

  For example if my video is 72 frames long, my ’mod’ would be 72 / 30, which is 2.4.

  I’m running this from a python script so i’m doing something like the following for the filter :

  select='not(mod(n\," + str(mod) + "))'

  I think the mod has to be an integer (?) so I could either round down and use 2 which gives me 36 images or round up which gives me 24 images

  Whats the best way to get exactly 30 ? - obviously the interval wouldn’t be identical but thats fine.

  Maybe I could use a for loop to generate a list of the frames closest to the desired interval and then pass that in as the select filter ?

  e.g. to get the frames I would do something like this :

  nframes = 72 # number of frames in video
  
  outImages = 30 # number of images I want
  
  mod = float(nframes) / outImages # 2.4
  
  
  
  frames = []
  
  
  
  idx = 1
  
  
  
  while i < nframes:
  
      print str(idx) + ": " + str(math.floor(i+0.5)) 
  
      frames.append(int(math.floor(i+0.5)))
  
      idx += 1
  
      i += mod

  Then am I able to pass that (the frames list) into the ffmpeg command ? Or can I tell ffmpeg to do something similar ?

• Can't find a good solution to play a MPEG2-TS (no HLS) stream on my iOS App

  29 octobre 2019, par Heidan34

  I’m currently looking for an easy to implement iOS media player library that can cover my needs which are :

  • Being able to play a MPEG2-TS (.ts) without hls.

  • Being able to authenticate the video request with a bearer in the header

  I tried some without success, most of the other ones were not maintained anymore :

  • AVPlayer (native)
  • SGPlayer
  • VLCKit (video ok but crashes randomly + not able to give a custom http header)
  • ffmpeg-avplayer

  Could you please help me ?

  Thanks !