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• vf_fade : Make sure to not miss the last lines of a frame

  16 février 2017, par Martin Storsjö

  vf_fade : Make sure to not miss the last lines of a frame
  When slice_h is rounded up due to chroma subsampling, there’s
  
  a risk that jobnr * slice_h exceeds frame->height.
  Prior to a638e9184d63, this wasn’t an issue for the last slice
  
  of a frame, since slice_end was set to frame->height for the last
  
  slice.
  a638e9184d63 tried to fix the case where other slices than the
  
  last one would exceed frame->height (which can happen where the
  
  number of slices/threads is very large compared to the frame
  
  height).
  However, the fix in a638e9184d63 instead broke other cases,
  
  where slice_h * nb_threads < frame->height. Therefore, make
  
  sure the last slice always ends at frame->height.
  CC : libav-stable@libav.org
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavfilter/vf_fade.c

• Anomalie #3894 : Jointures (erronées ?) avec les boucles documents et leurs critères

  26 janvier 2017, par tcharlss (*´_ゝ｀)

  J’ai testé avec divers objets que j’avais sous la main pour voir, on reprenant le même procédé :

  • un document attaché à 2 objets, vu=oui pour le N°1, et vu=non pour le N°2
  • id_patate=1 dans l’URL
  • {id_patate?}{vu=non} dans la boucle

  Ça n’a fait la bonne jointure que pour 1 seul objet, donc c’est plutôt une exception on dirait.
  Rigolo : le nom de la jointure superflue s’incrémente entre chaque test, j’ai fini à L8 ! (L5 je l’ai enlevé, c’était sur les auteurs, donc même ambiguïté que pour les mots clés)

  Album [OK] :¶

  SELECT documents.fichier
  FROM spip_documents AS `documents`  
  INNER JOIN spip_documents_liens AS L1 ON ( L1.id_document = documents.id_document )
  WHERE (documents.taille > 0 OR documents.distant=’oui’)
      AND (L1.id_objet = 1)
      AND (L1.objet = ’album’)
      AND (L1.vu = ’non’)
  GROUP BY documents.id_document
  

  Brève [PAS OK] :¶

  SELECT documents.fichier
  FROM spip_documents AS `documents`  
  INNER JOIN spip_documents_liens AS L2 ON ( L2.id_document = documents.id_document ) 
  INNER JOIN spip_documents_liens AS L1 ON ( L1.id_document = documents.id_document )
  WHERE (documents.taille > 0 OR documents.distant=’oui’)
      AND (L2.id_objet = 1)
      AND (L2.objet = ’breve’)
      AND (L1.vu = ’non’)
  GROUP BY documents.id_document
  

  Forum [PAS OK] :¶

  SELECT documents.fichier
  FROM spip_documents AS `documents`  
  INNER JOIN spip_documents_liens AS L3 ON ( L3.id_document = documents.id_document ) 
  INNER JOIN spip_documents_liens AS L1 ON ( L1.id_document = documents.id_document )
  WHERE (documents.taille > 0 OR documents.distant=’oui’)
      AND (L3.id_objet = 1)
      AND (L3.objet = ’forum’)
      AND (L1.vu = ’non’)
  GROUP BY documents.id_document
  

  Mot [PAS OK] (là c’est un peu spécial car il y a une ambiguïté avec mots_liens) :¶

  SELECT documents.fichier
  FROM spip_documents AS `documents`  
  INNER JOIN spip_mots_liens AS L4 ON ( L4.id_objet = documents.id_document AND L4.objet=’document’) 
  INNER JOIN spip_documents_liens AS L1 ON ( L1.id_document = documents.id_document )
  WHERE (documents.taille > 0 OR documents.distant=’oui’)
      AND (L4.id_mot = 1)
      AND (L1.vu = ’non’)
  GROUP BY documents.id_document
  

  Abonnement [PAS OK] :¶

  SELECT documents.fichier
  FROM spip_documents AS `documents`  
  INNER JOIN spip_documents_liens AS L6 ON ( L6.id_document = documents.id_document ) 
  INNER JOIN spip_documents_liens AS L1 ON ( L1.id_document = documents.id_document )
  WHERE (documents.taille > 0 OR documents.distant=’oui’)
      AND (L6.id_objet = 1)
      AND (L6.objet = ’abonnement’)
      AND (L1.vu = ’non’)
  GROUP BY documents.id_document
  

  Ticket [PAS OK] :¶

  SELECT documents.fichier
  FROM spip_documents AS `documents`  
  INNER JOIN spip_documents_liens AS L7 ON ( L7.id_document = documents.id_document ) 
  INNER JOIN spip_documents_liens AS L1 ON ( L1.id_document = documents.id_document )
  WHERE (documents.taille > 0 OR documents.distant=’oui’)
      AND (L7.id_objet = 1)
      AND (L7.objet = ’ticket’)
      AND (L1.vu = ’non’)
  GROUP BY documents.id_document
  

  Adresse [PAS OK] :¶

  SELECT documents.fichier
  FROM spip_documents AS `documents`  
  INNER JOIN spip_documents_liens AS L8 ON ( L8.id_document = documents.id_document ) 
  INNER JOIN spip_documents_liens AS L1 ON ( L1.id_document = documents.id_document )
  WHERE (documents.taille > 0 OR documents.distant=’oui’)
      AND (L8.id_objet = 1)
      AND (L8.objet = ’adresse’)
      AND (L1.vu = ’non’)
  GROUP BY documents.id_document
  

• ffmpeg resulting bitrate higher than expected. did i miss something ? [migrated]

  7 octobre 2013, par zantafio

  i am using ffmpeg to create some h264 transport streams.
  the bitrate for video is 496k, for audio 64k.
  However when the ( 2-pass ) encoding is done, i get a stream with more then 600k.
  i am using the following syntax in my script :

  codec=h264
  
  streamsuffix=ts
  
  audiocutoff=15000
  
  audioprofile=aac_low
  
  audiosamplerate=48000
  
  video_med=496k
  
  audio_med=64k
  
  suffix_med=_med
  
  preset=veryslow
  
  threads=4
  
  dirname="${1%/*}"
  
  filename=$(basename "$1")
  
  extension="${filename##*.}"
  
  filename="${filename%.*}"
  
  
  
  ffmpeg -i $filename"."$extension -preset $preset -strict experimental -threads $threads -c:v $codec -b:v $video_med -bsf:v h264_mp4toannexb -pass 1 -an -f rawvideo -y /dev/null 
  
  ffmpeg -y -i $filename"."$extension -preset $preset -strict experimental -threads $threads -c:a aac -cutoff $audiocutoff -profile:a $audioprofile -b:a $audio_med -ar $audiosamplerate  -c:v $codec -b:v $video_med -bsf:v h264_mp4toannexb -pass 2 $filename$suffix_med"."$streamsuffix

  did i miss something ? do i need to enforce the target bitrate ?
  thanks a lot !