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• Arecord->FFMPEG works but FFMPEG w/ ALSA stutters ?

  7 février 2017, par user2989813

  I am trying to stream audio from my Pi Zero and my I2s MEMS mic. I would like to stream using FFMPEG and ALSA (which I have already compiled) but I’m running into stuttering issues.

  1. FFMPEG + ALSA

     ~/special/ffmpeg/ffmpeg -report -f alsa -ar 48000 -ac 2 -acodec pcm_s32le -i mic_sv -f lavfi -i testsrc -c:v h264_omx -c:a aac -ab 32k -bufsize 32k -f flv rtmp://209.85.230.23/live2/KEY

  This results in constant stuttering and choppiness.

  2. Arecord piped directly to FFMPEG

     arecord -Dmic_sv -c2 -r48000 -fS32_LE | ~/special/ffmpeg/ffmpeg -report -acodec pcm_s32le -i - -f lavfi -i testsrc -c:v h264_omx  -acodec aac -ab 32k -bufsize 32k -f flv rtmp://209.85.230.23/live2/KEY

  This results in a coherent audio stream, but with skipping every 5 seconds or so.

  3. Arecord recorded to a wav file, piped into FFMPEG

     arecord -Dmic_sv -c2 -r48000 -fS32_LE -twav temp.v &
~/special/ffmpeg/ffmpeg -report -re -i temp.v -f lavfi -i testsrc -c:v h264_omx -ac 2 -acodec aac -ab 32k -bufsize 32k -async 2 -f flv rtmp://209.85.230.23/live2/KEY

  This results in a perfect audio stream.

  I don’t know why #3 works but #2 and #1 cause problems. Any suggestions ?

• Grid/Mesh warping of videos with OpenCV

  2 février 2017, par andreas

  I would like to do some warping with OpenCV applied on Videos. Here is a demo in Javascript which perfectly explains what I want to achieve via OpenCV :

  http://persistent.info/web-experiments/distortion/
  Please select "Tron Legacy" in the drop down menu "Datasource"

  Here is also screenshot of the demo :

  Screenshot of the Demo

  I am not an expert in OpenCV, but as far as I know there are only methods about camera calibration which deals with distortions (but only with special ones like radial and tangential distortions). For my purpose, I need a more general approach.

  The overall goal : apply some kind of "filter" on any video which generates this kind of distortion, based on a grid which can be adjusted via drag and drop by a user. This filter does not have to work in real time. Hence, if you know any other frameworks which can be used for this, please let me know :-) I´ve checked the filter section of FFMPEG, but it seems that also these filters are not appropriate.

  Thanks for your help !!

• 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