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• Write Live Photo metadata to video using FFMPEG

  13 août 2021, par Luke Burns

  According to Apple Live Photo file format, there are three pieces of metadata that need to be written for a JPEG and MOV to be accepted as a live photo. I can use exiftool and ffmpeg to write the necessary content identifier metadata.

  


  For the JPEG :

  


  exiftool -TagsFromFile reference.jpeg -makernotes -ContentIdentifier image.jpeg
exiftool -ContentIdentifier="$id" image.jpeg


  


  Similarly, ffmpeg can be used to write the top-level Quicktime metadata with matching id.

  


  However I'm having trouble with the timed metadata : ["com.apple.quicktime.still-image-time" : 0xFF].

  


  I can't even manage to produce a copy of an existing live photo MOV file using ffmpeg that preserves the necessary timed metadata.

  


  ffmpeg -i original.mov -map 0 -c copy -movflags use_metadata_tags copy.mov


  


  copies the global metadata (i.e. com.apple.quicktime.content.identifier), but loses the necessary still-image-time which can be confirmed using exiftool :

  


  > exiftool -G -U -ee original.mov | grep 'Still Image Time'
[QuickTime]     Still Image Time                : -1
> exiftool -G -U -ee copy.mov | grep 'Still Image Time'
> 


  


  How can I write the timed metadata using ffmpeg—specifically the still-image-time data ?

  


  Edit : it looks like this may be happening because ffmpeg does not know how to handle the mebx tag on data streams :

  


  [mov @ 0x7fb232091400] Unknown hldr_type for mebx, writing dummy values


  


  And ffmpeg doesn't seem to have a way to copy unknown streams. This appears to also be a problem for dealing with the fdsc tag in GoPro metadata streams (e.g. see https://gist.github.com/radimklaska/8974637522a751adb49db0de3be482c9#file-gopro_hevc_to_dnxhd-sh-L125), so it's often copied over as gpmd data, which ensures it's not overwritten with dummy values, but this trick doesn't work in the case of live photos mebx metadata.

  


• linking libavcodec os x ffmpeg ApplicationServices.framework

  30 décembre 2015, par Grady Player

  Here is my error : (newer version of ffmpeg)

  dyld: Library not loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
  
    Referenced from: /Users/me/path/to/lib/libavcodec.dylib
  
    Reason: Incompatible library version: libavcodec.dylib requires version 64.0.0 or later, but ApplicationServices provides version 1.0.0

  I have read the questions on SO that say you need to link ApplicationServices.framework... which I have done, it makes no difference...

  I have searched for other versions of that framework :

  $ mdfind ApplicationServices.framework
  
  /System/Library/Frameworks/ApplicationServices.framework

  just one...

  so then inspecting frameworks...

  $ otool -L /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices 
  
  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices:
  
      /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 48.0.0)
  
      /System/Library/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics (compatibility version 64.0.0, current version 600.0.0)
  
  ...

  and libavcodec

  otool -L ../lib/libavcodec.dylib 
  
  ../lib/libavcodec.dylib:
  
      libavcodec.dylib (compatibility version 56.0.0, current version 56.60.100)
  
      @loader_path/libswresample.dylib (compatibility version 1.0.0, current version  ...
  
  ...
  
  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 64.0.0, current version 600.0.0)

  I am compiling everything with -mmacosx-version-min=10.7

  so maybe a bug in the toolchain ?

  compiler :

  clang -v
  
  Apple LLVM version 7.0.2 (clang-700.1.81)
  
  Target: x86_64-apple-darwin15.2.0
  
  Thread model: posix

  linker :

  ld -v
  
  @(#)PROGRAM:ld  PROJECT:ld64-253.9
  
  configured to support archs: armv6 armv7 armv7s arm64 i386 x86_64 x86_64h armv6m armv7k armv7m armv7em (tvOS)
  
  LTO support using: Apple LLVM 7.0.2 (clang-700.1.81)

• How to simplify the script for ffmpeg ?

  27 mars 2018, par Pravesh Kumar

  I want this script to be simplified

  I am having this given simple script ; I would like to simplify this script can anyone help me to add text with the proper time interval and fade in and out effect.

  ffmpeg -y -i video.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='Which of these is not an event listener adapter defined in the java.awt.event package?': fontcolor=white: fontsize=40: x=100:y=200, \
  
  format=yuva444p,fade=t=in:st=1:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out.mp4
  
  
  
  ffmpeg -y -i test_out.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='a) public void apple(String s, int i) {}': fontcolor=white: fontsize=40: x=100:y=(200) + 50 * 2, \
  
  format=yuva444p,fade=t=in:st=3:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out1.mp4
  
  
  
  ffmpeg -y -i test_out1.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='b) public int apple(int i, String s) {}': fontcolor=white: fontsize=40: x=100:y=(200) + 50 * 3, \
  
  format=yuva444p,fade=t=in:st=4:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out2.mp4
  
  
  
  ffmpeg -y -i test_out2.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='c) public void apple(int i, String mystring) {}': fontcolor=white: fontsize=40: x=100:y=(200) + 50 * 4, \
  
  format=yuva444p,fade=t=in:st=5:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out3.mp4
  
  
  
  ffmpeg -y -i test_out3.mp4 -filter_complex \
  
  "[0]split[base][text];[text] \
  
  drawtext=fontfile=gvr.otf:text='d) public void Apple(int i, String s) {}': fontcolor=white: fontsize=40: x=100:y=(200) + 50 * 5, \
  
  format=yuva444p,fade=t=in:st=6:d=1:alpha=1,fade=t=out:st=8:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" test_out4.mp4