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• How to get ffmpeg to run on Heroku ? (libpulsecommon-15.99.so error)

  10 octobre 2023, par Fabien Snauwaert

  I'm trying to run ffmpeg on Heroku using an Aptfile (for use in a Flask app where I want to be able to perform audio conversions using pydub, which works fine locally.)

  


  # Aptfile
libsndfile1
libsndfile1-dev
ffmpeg
libvpx7
libpulse0
pulseaudio


  


  I've got these buildpacks :

  


  # Output from `heroku buildpacks`
1. heroku-community/apt
2. heroku/python


  


  And I keep getting this error with a simple heroku run 'ffmpeg --version' :

  


  


  ffmpeg : error while loading shared libraries : libpulsecommon-15.99.so : cannot open shared object file : No such file or directory

  


  


  This is on Heroku-22, but I was getting the same error on Heroku-20.

  


  Now I've spent hours on this and I'm still confused as to...

  


  

  1. What is libpulsecommon-15.99.so even part of ?

  


  2. Is it a case of the library not being installed ? Or being installed but not found ?

  


  


  

  • ls $HOME/.apt/usr/lib/x86_64-linux-gnu | grep libpulse (where $HOME is /app/) gives :

  


  


  libpulse-simple.so.0
libpulse-simple.so.0.1.1
libpulse.so.0
libpulse.so.0.24.1


  


  

  • echo $LD_LIBRARY_PATH returns /app/.heroku/vendor/lib:/app/.heroku/python/lib:/app/.apt/usr/lib/x86_64-linux-gnu:/app/.apt/usr/lib/i386-linux-gnu:/app/.apt/usr/lib:

  


  


  I'm lost and these are hours of my life I'm not going to get back 🤔😅

  


  ---

  


  I'm also wondering if there's much a point trying to get ffmpeg to work on Heroku this way : with the dependencies listed above (in the Aptfile), I'm already at 487 MB in slug size (out of a 300 MB soft limit, 500 MB hard limit), for a codebase under 1 MB.

  


  Any help welcome. I'll update the question as needed.

  


• What's the proper way to use Docker multi-stage builds to copy a package installed with apt ?

  25 décembre 2023, par Leo Jiang

  I have apt-get -y install ffmpeg --no-install-recommends in my dockerfile and it's taking up more than half the image size (500MB). I read somewhere that I can try using Docker multi-stage build to reduce the file size.

  


  Am I supposed to do something like :

  


  FROM node:20.9.0-slim
RUN apt-get -y update \
  && apt-get -y install ffmpeg --no-install-recommends \
  && apt-get clean

FROM node:20.9.0-slim
COPY --from=0 /usr/bin/ffmpeg
COPY --from=0 /usr/bin/ffplay
COPY --from=0 /usr/share/ffmpeg/ffprobe.xsd
COPY --from=0 /usr/share/lintian/overrides/ffmpeg


  


  I ran dpkg -L ffmpeg to see that ffmpeg has 30 files. Am I supposed to copy over all of the files or is just /usr/bin/ffmpeg enough ? If I have to copy all of them, it seems like it'll break easily.

  


• ffplay - change playback speed without re-encoding

  18 novembre 2017, par Timothy Tan

  I have some .264 video files that I would like to view at half playback speed, without encoding them into a new file. I remember using ffplay to do this in the past, but it was some time ago, and I can’t seem to be able to do it now. From lots of searching, this is what is supposed to work :

  ffplay -f h264 -vf "setpts=2.0*PTS" filename.264

  However this does not seem to change the playback speed at all. If I try :

  ffplay -f h264 -filter:v "setpts=2.0*PTS" filename.264

  I get an error message saying ’Failed to set value ’setpts=2.0*PTS’ for option ’filter:v’ : Option not found’.

  I specifically remember being able to do this before but cannot find any information about this now. Converting the videos is not really an option because the files are finicky and often cause an error halfway through converting, corrupting the whole file.

  Is there a simple solution to this problem ? Am I typing one of the commands wrongly ?