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• How can we achieve textAlign="center" within box in case of multiline text using ffmpeg drawtext ? [closed]

  13 septembre 2024, par Ata MuhiUlDin

  When working with drawtext in ffmpeg, it allows to enable box to show behind the text, and also allows to assign some background color to it.

  


  But when it comes to multiline text, let's say there are three lines as shown in picture as current result :

  


  

  


  It never align text to center. But I want results like shown below :

  


  

  


  This time am using following ffmpeg command to draw text :

  


  -vf "drawtext=text='${text}': x=((w*${x})/${DIMENSIONS.width}): y=((h*${y})/${DIMENSIONS.height}):fontsize=36:fontcolor=yellow@0.9: box=1: boxcolor=black@0.6:boxborderw=20" -c:a copy

  


• Audio merging using ffmpeg : Error decoding a SILK frame

  29 janvier 2018, par arjuncc

  I am using following command to merge two audio files with ffmpeg. On the output file one of the audio is not audible. When these audios are taken separately both files are audible(mka file).

  ffmpeg  -i file1.mka -i file2.mka -filter_complex "[1]adelay=12509.000000|12509.000000[d];[0][d]amix=inputs=2" -strict
  
  -2 output_audio.webm

  I am getting following error in log

  [opus @ 000000fba65e22c0] Error decoding a SILK frame.
  
  [opus @ 000000fba65e22c0] Error decoding an Opus frame.
  
  [opus @ 000000fba65e22c0] LBRR frames is not implemented. Update your FFmpeg ver
  
  sion to the newest one from Git. If the problem still occurs, it means that your
  
   file has a feature which has not been implemented.

  I have had a hint form this and this link but It was also not helpful.

  Finally I converted file ’file2.mka’ into mp3 and merged with the first file, at that time audio is clear, also the synching is perfect. So I suppose data is not lost, It should be an issue with codec. Can anyone help ?
  I have also tried below command but no luck

  ffmpeg  -i file1.mka -i file2.mka -filter_complex "[1]adelay=12509.000000|12509.000000[d];[0][d]amix=inputs=2" -map 0:0 -c:a libopus -map 1:0  -strict -2 output_audio.webm

  Full implementation is given in this link

• Is there a way to cut movement "dead air" on a screen recording ? [closed]

  16 mai 2023, par Raelbe

  I have got a couple of screen recordings of a painting I've done, and I've managed to concat the files together.

  


  Unfortunately, there is a lot of "dead air" in the video (where I have left my desk, so there is no movement happening on screen) is there a way to cut out this down time ?

  


  I found an example that another artist uses for his screen recordings, so I plugged it in with my file directory's. This is what I used :

  


  .\ffmpeg -f concat -safe 0 -i "merge.txt" -vf npdecimate=hi=64*12:lo=64*5:frac=0.33,seipts=N/30/TB,"setpts=0.25*PTS" -r 30 -crf 30 -an Illu_Test.mp4


  


  I got this error message at the end :

  


  [AVFilterGraph @ 000001cadfe5b1c0] No option name near 'N/30/TB'
[AVFilterGraph @ 000001cadfe5b1c0] Error parsing a filter description around: ,setpts=0.25*PTS
[AVFilterGraph @ 000001cadfe5b1c0] Error parsing filterchain 'npdecimate=hi=64*12:lo=64*5:frac=0.33,seipts=N/30/TB,setpts=0.25*PTS' around: ,setpts=0.25*PTS
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0`


  


  So I chopped it up a bit and this is what I used to concat the files and it worked perfectly.

  


  .\ffmpeg -f concat -safe 0 -i "merge.txt" -crf 30 -an Illu_Test.mp4


  


  Now, I'm looking to cut out the seconds of no movement. I'm unsure what the -crf command does (as stated I am brand new to this) OG artist states that :

  


  "This is the tolerance level that determines whether there has been enough change between frames or not to be considered as detected motion."

  


  Any help would be appreciated.

  


  (Apologies if the format of this question is wrong)