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• Complex audio volume changes with ffmpeg

  29 June 2016, by coco

  Using ffmpeg, how much control can we have over the audio levels? For example, I would like to map an "M" shape over the program’s timeline:

  t0 - t1 : fade in from 0 to 1
  
  t1 - t2 : play at full volume
  
  t2 - t3 : fade out to 25%
  
  t3 - t4 : play at 25% volume
  
  t4 - t5 : fade in (from 25%) to full volume
  
  t5 - t6 : play at full volume
  
  t6 - t7 : fade out from 1 to 0

  Can this be done? The combinations I’ve tried (of afade and volume, and using timeline editing) have not been successful so far.

  Here is something that is close:

  ina="infile.caf"
  
  out="outfile.mp3"
  
  
  
  time ffmpeg -i $ina -af \
  
  "afade=enable='between(t,0,3)':t=in:ss=0:d=3, \
  
  afade=enable='between(t,7,8)':t=out:st=7:d=1, \
  
  volume=enable='between(t,8,12)':volume=.25:eval=frame, \
  
  afade=enable='between(t,12,13)':t=in:st=12:d=1, \
  
  afade=enable='between(t,15,18)':t=out:st=15:d=3" \
  
  $out

  .. but at the two middle points (the point where it fades out to 25%, and the point where it fades back in to full volume) there are glitches - audible sound clicks.

• avformat/aviobuf: Stop restricting dynamic buffer sizes to INT_MAX/2

  24 May 2020, by Andreas Rheinhardt

  avformat/aviobuf: Stop restricting dynamic buffer sizes to INT_MAX/2
  This has originally been done in 568e18b15e2ddf494fd8926707d34ca08c8edce5
  
  as a precaution against integer overflows, but it is actually easy to
  
  support the full range of int without overflows.
  Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/aviobuf.c

• Anomalie #2910: Erreur 404 après redirection après message forum ds un site avec URLs arbo.

  3 May 2013, by Joachim SENE

  cedric - a écrit :

  Pas d’info plus précise pour voir le bug ? url de ton site sur lequel tu constates le problème ?

  Par exemple sur ce site de test
  cette page
  http://rature.net/cj/tests-tentatives/photofiction/article/photofiction-15
  j’ai laisse un commentaire, le prévisualise
  pas de souci
  puis valide
  et tombe sur cette URL
  http://rature.net/cj/tests-tentatives/photofiction/article/tests-tentatives/photofiction/article/photofiction-15#forum1
  qui donne une 404
  car il faudrait ê redirigé sur :
  http://rature.net/cj/tests-tentatives/photofiction/article/photofiction-15#forum1

  sur Chrome/Mac.
  est-ce clair ?

  grand MERCI !