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• ffmpeg build on mac with videotoolbox enabled becomes unportable

  22 janvier 2020, par Alexander Novikov

  If i configure ffmpeg this way :

  ./configure --disable-everything --enable-static --disable-shared \
  
  --enable-gpl --enable-nonfree --enable-encoder=h264_videotoolbox,aac \ 
  
  --enable-muxer=mp4 --enable-protocol=file --enable-libfdk-aac 
  
  --enable-videotoolbox --disable-autodetect

  it works for my purposes (allows to encode h264 video with aac audio on Mac’s videotoolbox - an Apple QSV toolkit), but if i send it to any other computer except the one it was built on, it fails with something like this :

  dyld: Symbol not found: _kCVImageBufferTransferFunction_ITU_R_2100_HLG
  
    Referenced from: /Users/admin/Downloads/./ffmpeg
  
    Expected in: /System/Library/Frameworks/CoreVideo.framework/Versions/A/CoreVideo
  
   in /Users/admin/Downloads/./ffmpeg
  
  Abort trap: 6

  if i rebuild it this way :

  ./configure --disable-everything --enable-static --disable-shared
  
  --enable-gpl --enable-nonfree --enable-encoder=aac 
  
  --enable-muxer=mp4 --enable-protocol=file --enable-libfdk-aac 
  
  --disable-autodetect

  so with everything else but videotoolbox removed, it runs successfully on any other computer, so apparently ffmpeg needs to carry along something it doesn’t, for videotoolbox to work...

  i am actually building a C++ app with ffmpeg’s static libraries, but explaining what i do there will be a very long story and error message produced is exactly the same if i run it on different machines, so i better illustrate it on example of ffmpeg console utility itself.

  what are the configure switches i need to do to make the ffmpeg build portable please ?

• How To Implement FFMPEG LL-HLS

  8 septembre 2022, par Devin Dixon

  How is Low Latency HLS achieved with FFMPEG ? From my understanding thus far, I am seeing changes around the -f option. For example :

  


  -f dash -method PUT http://example.com/live/manifest.mpd


  


  But there isn't much information researching on LL-HLS with ffmpeg. Making smaller segments I am finding comes at the cost of choppiness in the stream. Has anyone done this ? And is the protocol actually adopted or just in "theory".

  


• How to use find to match substring of files to be concatted ?

  23 mars 2023, par Russell Batt

  complete beginner here, so sorry if this is painfully obvious. I'm trying to write a shell script to ffmpeg concat protocol a bunch of split video files together by looping over the files and dynamically adding the correct parts to be joined together. For example, turning this :
  

  


  titlea-00001234-01.ts
  
titlea-00001234-02.ts
  
titlea-00001234-03.ts
  
titleb-00001234-01.ts
  
titleb-00004321-02.ts
  
titleb-00004321-03.ts
  

  


  into this :
  

  


  titlea-00001234.mp4
  
titleb-00004321.mp4
  

  


  by doing this

  


  ffmpeg -i "concat:titlea-00001234-01.ts|titlea-00001234-02.ts|titlea-00001234-03.ts" -c copy titlea-00001234.mp4
ffmpeg -i "concat:titleb-00001234-01.ts|titleb-00001234-03.ts|titleb-00001234-03.ts" -c copy titleb-00001234.mp4


  


  But what I'm having trouble with is using find to add the correct parts after "concat:".

  


  Here's my best attempt :

  


  #!/bin/bash
for i in /path/to/files/*.ts
    do
        if [[ "$i" =~ (-01) ]]
        then
            j="${i##*/}"
            k="${j%-0*}"
            ffmpeg -i `concat:( find /path/to/files/ -type f -name "{$k}*" -exec printf "%s\0" {} + )` -c copy /path/to/output/"{$k%.ts}.mp4"
        else
            echo "no files to process"
            exit 0
        fi
    done


  


  But this gives an error of "No such file or directory".

  
Edit This solution worked perfectly for my needs https://stackoverflow.com/a/75807616/21403800 Thanks @pjh and everyone else for taking the time to help