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• libavcodec : Set hidden visibility on global symbols accessed from AArch64 assembly

  11 juillet 2022, par Martin Storsjö

  libavcodec : Set hidden visibility on global symbols accessed from AArch64 assembly
  The AArch64 assembly accesses those symbols directly, without
  
  indirection via e.g. the GOT on ELF. In order for this not to
  
  require text relocations, those symbols need to be resolved fully
  
  at link time, i.e. those symbols can't be interposable.
  Normally, so far, this is achieved when linking shared libraries
  
  in two ways ; we have a version script (libavcodec/libavcodec.v) which
  
  marks all symbols that don't start with av* as local. Additionally,
  
  we try to add -Wl,-Bsymbolic to the linker options if supported,
  
  making sure that such symbol references are resolved fully at link
  
  time, instead of making them interposable.
  When the libavcodec static library is linked into another shared
  
  library, there's no guarantee that it uses similar options (even though
  
  that would be favourable), which would end up requiring text relocations
  
  in the AArch64 assembly.
  Explicitly mark the symbols that are accessed from AArch64 assembly
  
  as hidden, so that they are resolved fully at link time even without
  
  the version script and -Wl,-Bsymbolic.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aacsbrdata.h
  • [DH] libavcodec/fft.h
  • [DH] libavcodec/vp9dsp.h
  • [DH] libavutil/attributes_internal.h

• Anomalie #3769 : form_hidden insère un hidden en trop

  16 avril 2016, par jluc -

  Exemple de situation où ça pose problème :

  Sur une page article, un formulaire de recherche multi critères utilise form_hidden et renvoie vers #URL_PAGEarticles (au pluriel). Cette page est polyvalente et la boucle d’affichage principal a tous les critères possibles, dont id_article ?.

  Vu que form_hidden récupère l’id_article de la page article courante, la page résultat reçoit l’id_article en critère... ce qui restreint drastiquement les résultats présentés !

• ffmpeg output 0 second with wrong coordinates and hidden text

  18 juillet 2023, par Abdullah Mohamed

  I'm trying to add some Text and Images to the video

  


  Code

  


  -i 'input.MOV' -i 'image.jpg'         -filter_complex "[0]crop=1181.25:2100.0:1089.375:0.0[v];
          color=black[c];
          [v]colorchannelmixer=0.39:0.769:0.189:0:0:0.349:0.686:0.168:0:0:0.272:0.534:0.131:0:0:0:0:0[v];
          [c][v]scale2ref[t][v];
          [t]setsar=1,
          colorkey=black,
          split=2[t1][t2];
                  [t1]drawtext=
          text=Abdullah Muhammad T1
          :fontsize=40.0
          :box=1
          :boxborderw=20.0
          :boxcolor=#2196f3
          :fontcolor=#f44336,
          rotate=10.0*PI/180:
  
          c=black@0[rotate];
      [v][rotate]overlay=x=400.0:y=300.0:shortest=1[v],
          
          
                  [t2]drawtext=
          text=Abdullah Muhammad T2
          :fontsize=40.0
          :box=1
          :boxborderw=20.0
          :boxcolor=#ffeb3b
          :fontcolor=#000000,
          rotate=10.0*PI/180:
  
          c=black@0[rotate];
      [v][rotate]overlay=x=0.0:y=0.0:shortest=1[v],
          
          
                  [1:v]scale=w=360.0:h=360.0,
          rotate=-90.0*PI/180:
  ow=rotw(iw-50):oh=roth(ih-50):
          c=black@0[rotate];
      [v][rotate]overlay=x=0.0:y=0.0:shortest=1[v],
          
          
                  [1:v]scale=w=360.0:h=360.0,
          rotate=30.0*PI/180:
  ow=rotw(iw-50):oh=roth(ih-50):
          c=black@0[rotate];
      [v][rotate]overlay=x=200.0:y=600.0:shortest=1
          
          
          " -c:a copy -preset ultrafast -y 'output.mp4'


  


  My Issues

  


  

  1. First image should be at 0,0 coordinates but it's not.

  


  2. There should be 2 Texts but 1 of them is hidden and the other is not fully shown.

  


  3. the video is 13 seconds and the output is only 0 second.

  


  


  Expected

  


  


  Texts should be shown and images should be in the right position and video output should be 13 seconds.

  


  


  Actual


  


  Another issue

  


  


  If I trimmed the video the output will still be the same duration

  


  


  -i 'input_video.MOV' -ss 0:00:00.000000 -t 0:00:16.216000 -i 'input_image.jpg'         -filter_complex "[0]crop=1181.25:2100.0:1089.375:0.0[v];
          color=black[c];
          [v]colorchannelmixer=0.39:0.769:0.189:0:0:0.349:0.686:0.168:0:0:0.272:0.534:0.131:0:0:0:0:0[v];
          [c][v]scale2ref[t][v];
          [t]setsar=1,
          colorkey=black,
          split=2[t1][t2];
                  [t1]drawtext=
          text=Abdullah Muhammad T1
          :fontsize=40.0
          :box=1
          :boxborderw=20.0
          :boxcolor=#2196f3
          :fontcolor=#f44336,
          rotate=10.0*PI/180:
  
          c=black@0[rotate];
      [v][rotate]overlay=x=400.0:y=300.0:shortest=1[v],
          
          
                  [t2]drawtext=
          text=Abdullah Muhammad T2
          :fontsize=40.0
          :box=1
          :boxborderw=20.0
          :boxcolor=#ffeb3b
          :fontcolor=#000000,
          rotate=10.0*PI/180:
  
          c=black@0[rotate];
      [v][rotate]overlay=x=0.0:y=0.0:shortest=1[v],
          
          
                  [1:v]scale=w=360.0:h=360.0,
          rotate=-90.0*PI/180:
  ow=rotw(iw-50):oh=roth(ih-50):
          c=black@0[rotate];
      [v][rotate]overlay=x=0.0:y=0.0:shortest=1[v],
          
          
                  [1:v]scale=w=360.0:h=360.0,
          rotate=30.0*PI/180:
  ow=rotw(iw-50):oh=roth(ih-50):
          c=black@0[rotate];
      [v][rotate]overlay=x=200.0:y=600.0:shortest=1
          
          
          " -c:a copy -preset ultrafast -y 'output.mp4'