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• FFMPEG : Is it possible to merge video clips but cutout overlapping frames ?

  18 avril 2019, par Muhammad Umer

  I’ve got clips of video game. These clips are highlights and recorded automatically when some event happens. I can find solutions to merge them using cli and ffmpeg. Clips are 3 minutes recordings. So if 2 events happen closely, < 3 min apart, then there is overlap. Is it possible to ignore/subtract/delete subsequent clips upto point where last frame that’s overlapping.

  EX: 
  
  Clips= A(1-4), B(7-11), C(9-13).
  
  
  
  B and C are overlapping. 
  
  
  
  Can ffmpeg detect overlapping frames in C and only merge (12-13).
  
  
  
  Clips are alphabetically sortable. 

• Can ffmpeg write metadata encoder when transcoding alac/flac to aac audio file ?

  11 juin 2022, par David I

  I have a collection of alac and flac files from Bandcamp and an ffmpeg instance compiled with libfdk_aac https://trac.ffmpeg.org/wiki/CompilationGuide/Centos#libfdk_aac and am trying to convert these to lossy audio aac files for non-critical listening.

  &#xA;

  With ffmpeg -i Liholesie\ -\ Shamanic\ Twilight\ -\ 09\ Gray\ Wings.m4a -c:a libfdk_aac -vbr 4 -c:v copy 09_Gray_wings_vbr4.m4a an expected aac .m4a audio file is produced, album art included, works well. There's one slight detail missing :

  &#xA;

  During the ffmpeg conversion process ffmpeg says :

  &#xA;

  Output #0, ipod, to '09_Gray_wings_vbr4.m4a':
  Metadata:
    major_brand     : M4A 
    minor_version   : 512
    compatible_brands: M4A isomiso2
    title           : Gray Wings
    artist          : Liholesie
    album_artist    : Liholesie
    album           : Shamanic Twilight
    comment         : Visit https://liholesie.bandcamp.com
    date            : 2021
    track           : 9
    encoder         : Lavf59.24.100
  Stream #0:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 700x700 [SAR 72:72 DAR 1:1], q=2-31, 90k tbr, 90k tbn (attached pic)
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16 (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.33.100 libfdk_aac 
..




  &#xA;

  and the file produced looks like that when ffprobed except that the Metadata : encoder field is missing :

  &#xA;

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '09_Gray_wings_vbr4.m4a':
  Metadata:
    major_brand     : M4A 
    minor_version   : 512
    compatible_brands: M4A isomiso2
    title           : Gray Wings
    artist          : Liholesie
    album_artist    : Liholesie
    album           : Shamanic Twilight
    date            : 2021
    encoder         : Lavf59.24.100
    comment         : Visit https://liholesie.bandcamp.com
    track           : 9
  Duration: 00:06:57.78, start: 0.000000, bitrate: 155 kb/s
  Stream #0:0[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 152 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x0]: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 700x700 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn (attached pic)


  &#xA;

  Is there a way to write the encoder field in the Metadata section when transcoding (or is "encoder" not supported for aac m4a ? That would be weird since ffmpeg says what it says when specifying output during transcoding) .

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  Any hints on how to write a self-defined text to said tag during transcoding are also welcome.

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• ffmpeg 'av_seek_frame()' not work in bink video

  19 juillet 2020, par ghoflvhxj

  I trying to use ffmpeg, to play video in my game.

  &#xA;

  when i open .avi file 'av_seek_frame()' work fine.&#xA;but if change to .bik file, it never work.&#xA;the function just return 0(which mean success) and seek to start.

  &#xA;

  anyone who know about this problem ? :(&#xA;please tell me why...

  &#xA;

  i uploaded sample player and video.&#xA;this use ffmpeg and call av_seek_frame to seek like my program.&#xA;check it please.&#xA;https://drive.google.com/file/d/1DVrX3EOzjxSfEA4EYpeSREaE2RLhB28Q/view?usp=sharing

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