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• ffmpeg - How to antialias webp/gif

  19 août 2019, par theParanoidAndroid

  I am trying to use ffmpeg to produce an animated GIF/WEBP from a set of pngs. However, the output images have jagged edges that I would like to smooth out somehow.

  The set of PNGs are of a rotating sphere, outputted from Blender. Here is one of the images (cropped to the edge to hide a company logo)

  

  However, when using the following commands :

  ffmpeg -i frames/%%4d.png -vf palettegen -y palette.png
  
  ffmpeg -v warning -i frames/%%4d.png -i palette.png -lavfi "paletteuse,setpts=PTS" -y out.gif
  
  ffmpeg -v warning -i frames/%%4d.png -y out.webp

  to generate .gif and .webp animations, the edges becomes jagged :

  

  I can’t convert to .mkv and back or something, as transparency has to be preserved.

  Can anyone help ?

• What does "dash" - mean as ffmpeg output filename

  26 août 2020, par DDS

  I'm trying to use ffmpeg with gnuplot to draw some audio spectra, I'm following this ffmpeg doc link.

  


  Now I'm asking what "dash" - means on this line right after -f data, it should be a filename : the last element of ffmpeg command should the output file but I have no files named - in the directory after running the command.

  


  ffmpeg -y -i in.wav -ac 1 -filter:a aresample=8000 -map 0:a -c:a pcm_s16le -f data - | gnuplot -p -e "plot 'code>

  


  I looked on ffmpeg docs but I didn't find anything.

  


• Applescript to batch convert videos with ffmpeg

  13 mai 2022, par Thad_Supersperm

  I'm trying to add padding to a large amount of videos in their folders. I created an app with AppleScriptEditor so I can drag and drop files and they're automatically converted. I found a script on the web, I edited it with the ffmpeg command I need, but it won't work because it wants to overwrite the source file.

  


  on open argv
    set paths to ""
    repeat with f in argv
        set paths to paths & quoted form of POSIX path of f & " "
    end repeat
    tell application "Terminal"
        do script "for f in " & paths & "; do ffmpeg -i \"$f\"  -vf pad=\"9/8*iw:ih:(ow-iw)/2:0:color=black\" \"$f\"; done"
        activate
    end tell
end open


  


  Note that I want to keep the filename, filetype and put the new file next to the old one but just add an underscore at the end of the new file, before the extension ; e.g. : file.ext. > file_.ext