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• Scaling videos for device that doesn't support aspect ratio metadata

  18 juillet 2017, par forthrin

  I have hundreds of videos which are all approximately 4:3 format, but with different resolutions and various cropping (eg. videos may be 640x480, 640x470, 630x480, etc.).

  I converted the videos into a fixed screen size (160x128) for a primitive device. When playing the videos on the device, some appear "thin", while in VLC on my computer, the aspect ratio is correct.

  I assume the reason for this is that the video player on the primitive device doesn’t honour the aspect ratio metadata in the video file. Here are two examples of metadata :

  • 320x240 SAR=1:1 DAR=4:3 (Displays correctly on device and desktop)
  • 480x480 SAR=4:3 DAR=4:3 (Displays thin on device, correct on desktop)

  How can I create a general command line that will give all videos correct playback on my primitive device, regardless of their original size and aspect ratio ?

  The best would be to somehow ask ffmpeg to remove the metadata, and compensate for it when scaling. Another possible option would be to add black bars so the video is always 160x128 pixels.

  I’m open to any solution. Below is my current version :

  for f in *; do ffmpeg -i $f -vcodec mpeg4 -vf scale=160:-1 out/$f; done

• FFmpeg On iOS can’t find delogo

  8 mai 2018, par Y.Y.Doe

  I integrated FFmpeg on iOS，and use “delogo” to clean watermark，but it does not work.
  And it logs :

  No such filter:delogo

  I don’t know why,and I need help

  it’s my iOS code to use FFmpeg

  dispatch_async(dispatch_get_global_queue(0, 0), ^{
  
      char *outPic = (char *)[DocumentPath(@"delogo.mp4") UTF8String];
  
      char *movie = (char *)[BundlePath(@"logo.mp4") UTF8String];
  
      char *a[] = {
  
          "ffmpeg",
  
          "-i",
  
          movie,
  
          "-vf",
  
          "delogo=x=10:y=10:w=250:h=120:show=1",
  
          outPic
  
      };
  
      ffmpeg_main(sizeof(a)/sizeof(*a),a);
  
  });

  my total log

  ffmpeg version 3.0 Copyright (c) 2000-2016 the FFmpeg developers
 built with Apple LLVM version 7.3.0 (clang-703.0.31)
 configuration: --target-os=darwin --arch=arm64 --cc='xcrun -sdk iphoneos clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch arm64 -mios-version-min=6.0 -fembed-bitcode' --extra-ldflags='-arch arm64 -mios-version-min=6.0 -fembed-bitcode' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/arm64
 WARNING: library configuration mismatch
 avutil      configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 avcodec     configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 avformat    configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 avdevice    configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 avfilter    configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 swscale     configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 swresample  configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 libavutil      55. 17.103 / 55. 17.103
 libavcodec     57. 24.102 / 57. 24.102
 libavformat    57. 25.100 / 57. 25.100
 libavdevice    57.  0.101 / 57.  0.101
 libavfilter     6. 31.100 /  6. 31.100
 libswscale      4.  0.100 /  4.  0.100
 libswresample   2.  0.101 /  2.  0.101
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/daiyangyang/Library/Developer/CoreSimulator/Devices/02A8BC3F-5E46-453A-A3B4-A42563C518EA/data/Containers/Bundle/Application/4E0BB47F-5D3E-42A3-BC76-2D7D03657870/去水印.app/logo.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2mp41
   encoder         : Lavf57.25.100
 Duration: 00:02:31.37, start: 0.023220, bitrate: 472 kb/s
   Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x352 [SAR 1:1 DAR 20:11], 338 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default)
   Metadata:
     handler_name    : VideoHandler
   Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
   Metadata:
     handler_name    : SoundHandler
[AVFilterGraph @ 0x7fbabb519e00] No such filter: 'delogo'
Error opening filters!

  I integrated FFmpeg by "FFmpeg-iOS-build-script"(https://github.com/kewlbear/FFmpeg-iOS-build-script)

• Anomalie #3302 (Nouveau) : problème installation de table & _DIR_PLUGINS_SUPP sur spip mutualisé

  18 octobre 2014, par PIerre LASZCZAK

  Bonjour,

  Sur un spip mutualisé, lorsque je defini un dossier supplémentaire de plugins
  

      define(’_DIR_PLUGINS_SUPPL’,_DIR_RACINE.’sites/’.$site.’/plugins/’) ;
  

  
  SVP ne supprime pas les tables declarées dans les plugins copiés dans ce repertoire "_DIR_PLUGINS_SUPPL".
  du coup j’ai testé en les déplaçant dans le dossier de base /racine_spip/plugins et en testant une install / desinstall les tables sont bien supprimés

  Pour confirmer que je ne faisait pas n’importe quoi avec mes plugins en dev, j’ai testé avec le plugin chat2 pour voir si je reproduit le bug

  $cd /var/www/racine_spip/plugins
  $wget http://marcimat.magraine.net/IMG/zip/chats.zip
  $unzip chat.zip
  

  Ensuite dans le backoffice
  gestion des plugins -> installer chat
  l’installation installe les tables correctement,
  gestion des plugins -> desinstaller chat
  la désinstallation supprime bien les tables.

  je déplace donc le plugin dans le dossier plugins de la racine
  

  $mv chat /var/www/racine_spip/plugins/chat /var/www/racine_spip/sites/mon_site.com/plugins
  

  j’actualise le backoffice

  gestion des plugins -> installer chat
  l’installation installe les tables correctement,
  gestion des plugins -> desinstaller chat
  la désinstallation ne supprime pas les tables !

  Sagit il d’un bug ou d’un comportement voulu ?