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• Revision 6919 : Gros changement... On change le pipeline diogene_champs_sup en ...

  22 août 2012, par kent1 — Log

  Gros changement...
  On change le pipeline diogene_champs_sup en diogene_objets
  Les champs_sup antérieurs $fluxarticle ?truc ? deviennent maintenant $fluxarticle ?champs_sup ?truc ?
  On fait cela pour gérer d’autres propriétés spécifiques par objet comme :
   $fluxpage ?type_orig ? = ’article’ ; => indique que le type d’origine est article ;
   $fluxpage ?diogene_max ? = 1 ; => indique que l’on ne peut avoir qu’un seul diogène de ce type ;
   $fluxpage ?ss_rubrique ? = true ; => indique que ce type de diogène est sans rubrique, ne peut correspondre à 1 secteur ;
  Passage en version 1.2.0

• Reuse value of a filter parameter for another one

  26 mars 2023, par Raphaël Goisque

  I have this command which draws a text ('First line Second line') on two different lines. Each text has a box drawn around it but they are not the same dimension as the size of the texts differs.

  


  As I want a unique box englobing the two lines, I thought of using the drawbox filter. The problem is that I need to know the values of the x parameter of the drawtext filters (i.e x=(main_w-text_w)/2) in order to set the x of the drawbox filter accordingly... but these value uses the variable text_w which is obviously not available from the drawbox filter.

  


  So does someone know if we can access the value of a parameter previously set ; or maybe create custom variables that we could reuse elsewhere in the command ?

  


  ffmpeg -y -i video.mp4 -vf /
"drawtext=box=1:boxcolor=white:fontcolor=black: /
text='First line':fontsize=55: /
x=(main_w-text_w)/2:y=main_h*1/6, /
drawtext=box=1:boxcolor=white:fontcolor=black: /
text='Second line':fontsize=55: /
x=(main_w-text_w)/2:y=main_h*1/6+57, /
drawbox=color=white" title.mp4


  


• ffmpeg perspective filter animation error

  17 mars 2021, par eeun

  I'm trying to create a pseudo-3d pan effect in ffmpeg using the perspective filter.

  


  Here is a sample for the starting point...

  


  ffmpeg -y -filter-complex "color=black:s=1600x900,trim=0:5,drawgrid=width=100:height=100:thickness=2:color=white,perspective=x0=200:y0=200:x1=1600:y1=0:x2=200:y2=700:x3=1600:y3=900[skew]" -an -map [skew] "skew-start.mp4"


  


  And here is a sample for the end point...

  


  ffmpeg -y -filter-complex "color=black:s=1600x900,trim=0:5,drawgrid=width=100:height=100:thickness=2:color=white,perspective=x0=0:y0=0:x1=1600:y1=0:x2=0:y2=900:x3=1600:y3=900[skew]" -an -map [skew] "skew-end.mp4"


  


  So far so good. Adding the animation would give this...

  


  ffmpeg -y -filter-complex "color=black:s=1600x900,trim=0:5,drawgrid=width=100:height=100:thickness=2:color=white,perspective=eval=frame:x0='200-(200*t/5)':y0='200-(200*t/5)':x1=1600:y1=0:x2='200-(200*t/5)':y2='700+(200*t/5)':x3=1600:y3=900[skew]" -an -map [skew] skew.mp4


  


  This is where the problem occurs. I get an error saying [Eval @ 000000f36ebfebf0] Undefined constant or missing '(' in 't/5)' Error while filtering: Invalid argument

  


  The perspective docs say it should work with an eval=frame option. Anyone got any ideas ? Does this look like a bug in ffmpeg ? I'm using the latest version, 4.3.2.