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• ffmpeg add metadata to ogg(opus) and embed image

  22 avril 2020, par Calendar

  like the title I want to add/change metadata to ogg(opus) files in one folder(one album/one artist).When i encode from wav/flac to opus i usually use

  



  for f in *.*; do ffmpeg -i "$f" -c:a libopus -b:a 510000 "${f%.*}.ogg"; done


  



  Then when i test one file with

  



  for f in *.*; do ffmpeg -i "$f" -c copy -metadata artist="artist name" -metadata album="album name" "${f%.*}.ogg"; done


  



  The result is the file reduced to just like 47kb(so i assumed that input and output name can't be same).

  



  So any efficient way to add/change metadata while retaining same name ?
And how to embed image to the ogg(opus) files ?I want to have cover art/image displayed when playing the files.

  


• avutil/channel_layout : move and improve the comment about unknown orders

  25 septembre 2022, par James Almer

  avutil/channel_layout : move and improve the comment about unknown orders
  Don't place it as doxy specific for the order field, and generalize it both to
  
  also cover already defined orders and to not make it seem like the user is
  
  required to handle a layout they don't fully support or understand.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavutil/channel_layout.h

• FFMPEG : titlecard for concatentaed video results in slow-mo

  3 septembre 2020, par epilitimus

  I have three clips I have extracted from a longer video. When I concatenate them together everything works fine, as would be expected since they all came from the same source.

  


  Now I want to add a title card to the front of the merged video.

  


  I generated an image in GIMP with the same dimensions as the video frames and then used ffmpeg to generate a 5 sec. video from it. When I concatenated it onto the front of the other three I run into problems.

  


  The title card segment plays correctly and then the remaining segments are (both video and audio) in slow-mo. Also the titlecard runs longer than 5 sec and the main segment audio starts before the corresponding video.

  


  I know the problem is with the generation of the title card clip but so far I can't figure out what I am missing. Obviously my bitrates are wrong but how do I get them to match up ?

  


  what I have so far :

  


  my generation script :

  


  #!/bin/bash

ffmpeg -y -ss 0:03:33 -t 0:0:33.5 -i seg1.vob -filter:a "volume=4" seg1.mp4
ffmpeg -y -ss 0:13:25.5 -t 0:0:57 -i seg1.vob -filter:a "volume=4" seg2.mp4
ffmpeg -y -ss 0:16:25.5 -t 0:0:43 -i seg1.vob -filter:a "volume=4" seg3.mp4
ffmpeg -y -ss 0:7:10 -t 0:0:10 -i seg1.vob -filter:a "volume=4" -vn -b:a 394k title.mp3
ffmpeg -y -loop 1 -i title.png -t 0:0:5 -i title.mp3 -c:a aac -b:a 394k -shortest title.mp4 
ffmpeg -y -f concat -safe 0 -i contents.txt -c copy merged.mp4 


  


  and contents.txt :

  


  file 'title.mp4'
file 'seg1.mp4'
file 'seg2.mp4'
file 'seg3.mp4'


  


  ffprobe on seg1.mp4 :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'seg1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:33.52, start: 0.000000, bitrate: 677 kb/s
    Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 275 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 6 channels, fltp, 394 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  


  and for title.mp4 :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'title.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:05.02, start: 0.000000, bitrate: 1290 kb/s
    Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 720x480 [SAR 191:194 DAR 573:388], 898 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 389 kb/s (default)
    Metadata:
      handler_name    : SoundHandler