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• Translating ffmpeg command line to C++ codec settings

  6 mars 2014, par pacificator

  I've been doing some work in ffmpeg for a while in C++.
  Most of the help regarding encoder settings is explained as command line options.
  For example (taken from the ffmpeg site) :

  -mbd rd -trellis 2 -cmp 2 -subcmp 2 -g 100 -pass 1/2’ 

  but beware the ’-g 100’ might cause problems with some decoders. Things to try :

   ’-bf 2’, ’-flags qprd’, ’-flags mv0’, ’- flags skiprd.

  This is not really usefull when you want to set these options in C.
  For example I managed to find int trellis ; in the AVCodecContext struct so that is one solved, but what about the others ?

  Is there a way to determine what command line parameters correspond to what AVCodecContext members ?
  I tried setting them like this :

  AVCodecContext* c;
  
  av_opt_set_int(c->priv_data, "cmp", 2, 0);

  But this returns an error code that the option does not exist.
  I've also tried :

    av_opt_set(c->priv_data, "cmp", "2", 0);

  I still get the error that the option does not exist.

  So, is there a way to determine what AVCodecContext members I should set that are equivalent to the ffmpeg command line parameters above ?

• Using FFMPEG to automatically set a single max filesize across multiple different sized files

  14 juin 2020, par DuffCreeper

  I don't really know how to word it any better but I'm trying to convert WEBM/GIF to MP4 with no sound

  



  The problem I'm facing is retaining the quality without having to sacrifice it across multiple files by having to resize them to 420p

  



  The idea was to hopefully somehow get FFMPEG to automatically determine the bitrate required for the file to hit the filesize of 10mb. Though I have looked everywhere online and I have not found a single answer regarding it, so either it's not possible or I'm blind

  


• When I tried to install react-native-ffmpeg, Build getting failed throwing error

  1er juillet 2020, par srinivas

  Version Using
compileSdkVersion 29
buildToolsVersion "26.0.0"


  


  What went wrong :
Could not determine the dependencies of task ':react-native-ffmpeg:compileDebugAidl'.


  


  


  Could not find com.arthenica:mobile-ffmpeg-com.febbler:4.3.1.
Required by :
project :react-native-ffmpeg