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• 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.

  


  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 :

  


  During the ffmpeg conversion process ffmpeg says :

  


  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 
..




  


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

  


  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)


  


  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) .

  


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

  


• FFMPEG curtain effect slideshow from images

  15 janvier 2020, par Atta

  I have bunch of images that i have to convert to slideshow with curtain effect. currently i am running this command that convert images to video.

  ffmpeg -r 1/5 -i img%d.png -c:v libx264 -vf "fps=25,format=yuv420p" video.mp4

  But how to achieve this kind of effect with ffmpeg. Image link Required result

  I searched online but not found any solution. I have clue of alpha mask but no idea how to use it for such result.

• Mix original clip audio with audio of an overlay clip

  28 octobre 2019, par Mr. Messy

  I have a video clip on which I want to add commentary videos (someone talking in a bubble).
  I have 3 commentary videos I need to insert in specific times.

  The video rendering is working well, but I can’t seem to add the audio tracks.
  I tried both amix and amerge, but I got the same issue.

  When I added "[0:1][2:1]amerge ;" I get the follwing :

  

  and the process freezes.

  The full ffmpeg command is as follows :

  ffmpeg -y   -i story.mp4
  
          -loop 1 -i mask.png
  
          -itsoffset 10 -i commentary1.mp4
  
          -itsoffset 22 -i commentary2.mp4
  
          -itsoffset 34 -i commentary3.mp4
  
          -filter_complex "[0:v]scale=w=1/2*in_w:h=1/2*in_h[vid1],
  
                          [2:v]crop=w=480:h=480:x=0:y=120[vid2in],
  
                              [1:v]fifo[2af],[2af]alphaextract[alf2],[vid2in][alf2]alphamerge[vid2alf],
  
                              [vid2alf]format=yuva420p,fade=in:st=10:d=0.5:alpha=1,fade=out:st=22.7294:d=0.5:alpha=1[vid2fade],
  
                              [vid2fade]scale=w=-1:h=160[vid2],
  
                              [vid1][vid2]overlay=790:10:enable='between(t\,10,21)'[out2],
  
                          [3:v]crop=w=480:h=480:x=0:y=120[vid3in],
  
                              [1:v]fifo[3af],[3af]alphaextract[alf3],[vid3in][alf3]alphamerge[vid3alf],
  
                              [vid3alf]format=yuva420p,fade=in:st=22:d=0.5:alpha=1,fade=out:st=32.768733:d=0.5:alpha=1[vid3fade],
  
                              [vid3fade]scale=w=-1:h=160[vid3],
  
                              [out2][vid3]overlay=790:10:enable='between(t\,22,33)'[out3],
  
                          [4:v]crop=w=480:h=480:x=0:y=120[vid4in],
  
                              [1:v]fifo[4af],[4af]alphaextract[alf4],[vid4in][alf4]alphamerge[vid4alf],
  
                              [vid4alf]format=yuva420p,fade=in:st=34:d=0.5:alpha=1,fade=out:st=44.598189:d=0.5:alpha=1[vid4fade],
  
                              [vid4fade]scale=w=-1:h=160[vid4],
  
                              [out3][vid4]overlay=790:10:enable='between(t\,34,45)'[out4]"
  
          -map [out4] -pix_fmt yuv420p -c:v libx264 -crf 18
  
          final_video.mp4

  (mask.png is a circle on a transparent image that crops the video to a bubble)

  Thank you for your help.