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• Compiling FFMPEG on CentOS DigitalOcean

  29 juillet 2015, par coder_uk

  I set up a DigitalOcean instance running CentOS 6.5 and successfully followed the guide to compile FFMPEG (https://trac.ffmpeg.org/wiki/CompilationGuide/Centos). Hurrah !

  But of course I realised that by default, DigitalOcean creates a root user and so ffmpeg now lives in /root/bin/ffmpeg. Which isn’t ideal because when I want to exec the ffmpeg bin from nginx, I would have to run nginx as root for it to have permission.

  Questions ...

  1) Long-shot, but presumably if I change the owner of the ffmpeg binary to nginx, it still won’t work, because nginx won’t be able to access the /root folder it is in. Correct ?

  2) I could run nginx as root (’user root’). But this seems like a very bad idea. Correct ?

  3) Which leaves me with the option of creating a new user, and then compiling ffmpeg into its home folder. But : which user ? EC2 creates ’ec2-user’, so should I make my own equivalent for DO ? But then won’t I have to run nginx as that user, else I’ll run into the same problem ?

  Or should I compile ffmpeg into the ’nginx’ home folder, if indeed it has one ? Is that how it is supposed to be done ?

  Since compiling ffmpeg takes ages, I don’t want to keep doing it, and the static files all seem very out of date. Thanks

• libavcodec : How do I use AVOptions to set up encoder parameters ?

  1er février 2023, par itzjackyscode

  libavcodec seems to have 3 ways to specify parameters for a codec :

  


  

  • Certain members of the AVCodecContext struct

  


  • values in an AVDictionary passed to avcodec_open2

  


  • AVOptions, which seem to cover everything the other two do

  


  


  Can I use AVOptions to setup all of the encoding parameters ? In addition, can AVOptions provide sensible defaults ? Google doesn't yield any results and there's no example provided in the documentation.

  


• How to remove ID3 audio tag image with ffmpeg

  18 juin 2014, par user1717735

  FFMPEG is really a great tool. I know it can edit ID3 tags and even remove all tags in a row :

  ffmpeg -i tagged.mp3 -map_metadata -1 untagged.mp3

  But even after that, there’s still the cover image.

  I don’t know how to remove it using ffmpeg. I know there’s other soft out there that can do the job - like eyed3 - but what’s the point to install it if ffmpeg can do it too, in one line, while encoding the audio ?