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• lavf/movenc : write track title metadata for mov files

  19 mars 2018, par Courtland Idstrom

  lavf/movenc : write track title metadata for mov files
  Track title (atom 'name') is a well defined user data atom for mov files. Existing code (for mp4) only writes title metadata if present.
  Relevant reference docs :
    https://developer.apple.com/library/content/documentation/QuickTime/Reference/QTRef_AtomsResources/Content/QTRef_AtomsResources4.html#//apple_ref/doc/uid/TP40004285-DontLinkChapterID_1--udta-
  
    https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html#//apple_ref/doc/uid/TP40000939-CH204-63839
  

  • [DH] libavformat/movenc.c

• fftools/ffmpeg : store stream media type in OutputStream

  11 avril 2023, par Anton Khirnov

  fftools/ffmpeg : store stream media type in OutputStream
  Reduces access to a deeply nested muxer property
  
  OutputStream.st->codecpar->codec_type for this fundamental and immutable
  
  stream property.
  Besides making the code shorter, this will allow making the AVStream
  
  (OutputStream.st) private to the muxer in the future.
  

  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_mux.c
  • [DH] fftools/ffmpeg_mux_init.c

• ffmpeg : How to assign an empty soundtrack to a video ?

  26 septembre 2013, par Jim Miller

  I'm using ffmpeg to build a short hunk of video from a machine-generated png. This is working, but the video now needs to have a soundtrack (an [audio] field) for some of the other things I'm doing with it. I don't actually want any sound in the video, so : is there a way to get ffmpeg to simply set up an empty soundtrack property in the video, perhaps as part of the call that creates the video ? I guess I could make an n-second long silent mp3 and bash it in, but is there a simpler / more direct way ? Thanks !