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• Fffmpeg mapping audio and video by language

  28 mars 2017, par Terrabyte

  I want to batch convert these mkv files, they contain more than one language. Instances include : Eng/Ger, Eng/JPN. Sometimes there are multiple video sources within the mkv for whatever reason :

  ive tried using :

  FFMPEG_PATH . ' -i ' . $localFile . ' -sn -map 0:v:0 -map 0:a:m:language:jpn -c:v ' . $videoCodec . ' -tune animation -crf 20 -refs 6 -bf 6 -trellis 1 -b_strategy 1 -profile:v high -level 4.0 -pix_fmt yuv420p -ac 2 -flags +aic+mv4 ' . $scale . ' ' . $convertedFilename;

  This one grabs the first video (this doesnt matter, but i need it to grab one video just in case)

  -map 0:v:0 -map 

  I don’t thing this one works because when i tried it, it grabbed the english one instead so i dont know the issue.

  0:a:m:language:jpn

  I could do

  0:m:language:jpn

  but then id have to remove : 0:v:0 and sometimes theres a issue where just using the general mapping would encode both video sources so it wold double in file sizes

  so how would i just map the audio file while keeping the video mapping ?
  Fgmpeg is really confusing with this instruction.

• libavformat/subfile : Improve AVSEEK_SIZE/SEEK_END seeking

  20 juin 2019, par Andreas Rheinhardt

  libavformat/subfile : Improve AVSEEK_SIZE/SEEK_END seeking
  The subfile protocol treats an end of 0 as meaning "until EOF" ; this got
  
  implemented by simply setting the end to INT64_MAX. But seeking relative
  
  to EOF or AVSEEK_SIZE seeking hasn't been adapted ; the result is that
  
  e.g. the duration of transport streams isn't correctly determined when
  
  this option is used. This is fixed in this patch.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/subfile.c

• Is there a method to use old versions of ffmpeg and opencv ?

  6 juin 2023, par mika_roll

  I'm trying to build a project through cmake and after some adjustements the terminal display some new errors about some libraries and I don't know how to fix them, an example :

  


  /usr/bin/ld: warning: libopencv_core.so.3.4, needed by /media/myfolder/lib/Linux64_x64/file.so.3.3, not found (try using -rpath or -rpath-link)

  


  and other errors like this one regarding libavcodec.so.57, libavformat.so.57...

  


  I've already tried to install libavcodec-dev etc and also ffmpeg and opencv by command line, and all these packages contain effectively the .so files that I need but all of them have been updated to the new version that doesn't match the one specified in the warning lines.
So is there a way to install these old versions ? Or should I try something different ? I don't really know what to do, I'm kinda new to these things so I hope I can find some help.

  


  Also, the project that I'm trying to build is not mine, someone else wrote it some time ago and my only task is to manipulate and adjust all the links to the different libraries.

  


  English is not my first language so I really hope I wrote an understandable request !