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• Simples loop to iterate over files and send them to ffmpeg

  25 octobre 2019, par user2752471

  I want to do a shell script that will iterate over several video files in a directory, send everyone of them to ffmpeg, that will then reencode each one, producing a reencoded file that will have the same name as the original, except with .avi extension instead .mkv or .mp4.

  I found a fairly simple script in another topic here on SO, tried to change it slightly to take into account the file extension and the destination directory.

  However my script only produces countless "anything : No such file or directory"

  Here is it :

  $ for f in $(find -type f -name *.mkv); do ffmpeg -n -i "$f" -c:v copy ".$f" ; done

  And these is the ffmpeg command that I usually use :

  ffmpeg -y -i  -vf scale=720:-2 -c:v mpeg4 -vtag xvid -b:v 969k -pass 1 -an -f avi /dev/null && ffmpeg -i -c:a libmp3lame -b:a 48k -ac 1 -vf scale=720:-2 -c:v mpeg4 -vtag xvid -b:v 969k -pass 2  .avi

  So I need to identify what is incorrect in the first script, that is considering each small word of the file’s name as a file, and then change it as to add all these ffmpeg parameters.

  Somethings that I do not understand in the script :

  1)Are the -type and f in find command necessary. From what I read of the documentation, all it does is to tell find that it shall look for normal files, something that seems irrelevant for my case. When I use find, I do : find starting dir -name filename. So do I have to keep it ?

  2)What -n means for ffmpeg ? I am currently without a man entry for ffmpeg. Is it necessary for my needs ?

  3)Do I need to have "" around $f ? What it does ?

  4)As far as I understand $ denotes a variable. But what the "f" after it does ? Do I need it ?

  5)The " ;" after the closing ")" and the ".$f" are necessary ? The first is used to indicate the end of the for loop,and the second the end of the ffmpeg command ?

  6)The "do" and the "does" are also necessary for the same motives behind the " ;"

  Here is my attempt of the ffmpeg part of the script. Please tell me what to change on it, as in the find part of it.

  do ffmpeg -n -y -i "$f.mkv" -vf scale=720:-2 -c:v mpeg4 -vtag xvid -b:v 969k -pass 1 -an -f avi /dev/null && ffmpeg -n -i "$f" -c:a libmp3lame -b:a 48k -ac 1 -vf scale=720:-2 -c:v mpeg4 -vtag xvid -b:v 969k -pass 2  ".$f.avi" ; done

  If I would like the script to also look for ".mp4" besides ".mkv" how I would need to change it ?

  Thanks for any input.

• ffmpeg not working after update to Mavericks

  24 février 2024, par Hudson Buddy

  After recently updating to Mavericks 10.9.5, my installation of ffmpeg has been bugging out

  



  Error :

  



  dyld: Library not loaded: /usr/local/lib/libx264.142.dylib
  Referenced from: /usr/local/bin/ffmpeg
  Reason: image not found
Trace/BPT trap: 5


  



  Any thoughts ? I'm not very familar with manual compiling and I installed ffmpeg through Homebrew.

  



  I tried uninstalling and doing :

  



  brew install ffmpeg --HEAD
brew install ffmpeg --build-from-source


  



  but it spits back a ./configure error

  



  ==> ./configure --prefix=/usr/local/Cellar/ffmpeg/2.4.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample
If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solve the problem.

READ THIS: https://github.com/Homebrew/homebrew/wiki/troubleshooting

These open issues may also help:
gpac 0.5.0 doesn't build against ffmpeg 2.4.1 (https://github.com/Homebrew/homebrew/issues/32978)


  


• ffmpeg not working after update to Mavericks

  24 février 2024, par Hudson Buddy

  After recently updating to Mavericks 10.9.5, my installation of ffmpeg has been bugging out

  



  Error :

  



  dyld: Library not loaded: /usr/local/lib/libx264.142.dylib
  Referenced from: /usr/local/bin/ffmpeg
  Reason: image not found
Trace/BPT trap: 5


  



  Any thoughts ? I'm not very familar with manual compiling and I installed ffmpeg through Homebrew.

  



  I tried uninstalling and doing :

  



  brew install ffmpeg --HEAD
brew install ffmpeg --build-from-source


  



  but it spits back a ./configure error

  



  ==> ./configure --prefix=/usr/local/Cellar/ffmpeg/2.4.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample
If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solve the problem.

READ THIS: https://github.com/Homebrew/homebrew/wiki/troubleshooting

These open issues may also help:
gpac 0.5.0 doesn't build against ffmpeg 2.4.1 (https://github.com/Homebrew/homebrew/issues/32978)