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• How to run ffmpeg on heroku-18 stack ?

  22 octobre 2020, par piotrkot

  I have a Java web app on Heroku. It's on heroku-18 stack with heroku/java buildpack.

  



  I need to compress some videos and due to the lack of such libraries for Java decided to install FFmpeg on Heroku.

  



  Adding FFmpeg buildpacks like https://github.com/kontentcore/heroku-buildpack-ffmpeg, https://github.com/jonathanong/heroku-buildpack-ffmpeg-latest was successful as FFmpeg was installed but they failed when running because of various linking problems.
For that I tried to add heroku-community/apt buildstack. My Aptfile file contains just the ffmpeg package.

  



  Still I'm getting
ffmpeg: error while loading shared libraries: libpulsecommon-11.1.so: cannot open shared object file: No such file or directory

  



  FFmpeg command that I try to run from the Java code is simple :
ffmpeg -i video.webm video-compressed.webm

  



  Am I missing something ?

  


• Can anyone tell me ffmpeg.wasm command to converting 24-bit color image to 8-bit color image without affecting transparency part ?

  4 avril 2024, par Rohit Nayak

  I am a new developer and currently developing a png compressor to compress png image file using next.js 14 app directory and I found the right command to do so

  


  ffmpeg -i input.png -c:v png -pix_fmt pal8 -vf "split[a][b];[a]alphaextract[am];[b]palettegen=stats_mode=diff[pl];[b][pl]alphamerge" output.png


  


  but i am unable to do so because I don't know how to convert that to ffmpeg.wash command.

  


  I am using node.js v20.11.0, @ffmpeg/ffmpeg version 0.12.6 and @ffmpeg/util 0.12.1", alone with @ffmpeg/core@ version 0.12.2 which seems to work well.

  


  My code is as following :

  


      ffmpeg.exec([
      "-i",
      `${file.name}`,
      "-c:v",
      "png",
      "-pix_fmt",
      "pal8",
      "-vf",
      "split[a][b];",
      "[a]alphaextract[am];",
      "[b]palettegen=stats_mode=diff[pl];",
      "[b][pl]paletteuse=new=1:alpha_threshold=128",
      `output.png`,
    ]);


  


  Is there anyone who can solve this problem ?
An early action will highly be appreciated😊

  


  Answer in the form of

  


  ffmpeg.exec([...commands ]) 


  


• Questions about license of ffmpeg in Android [on hold]

  23 décembre 2016, par Season

  I want to make an video editing app(may include advertisement or even earn money).

  And I found that ffmpeg is a great library for my app.

  And I can use it for compress video, trim video and change video format.

  The commands that the app may use :

  Reducing video size with same format and reducing frame size

  Cutting the videos based on start and end time using ffmpeg

  I found that ffmpeg is using LGPL and partially GPL licenses but I do not familiar with these two terms.

  What should I do so that I can use ffmpeg legally ?