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Guide Méthodologique Formats Projet TGE-Adonis ADONIS/SIAF/CINES-GM-0.5 Guide Méthodologique Formats Guide Méthodologique Pour le choix de formats numériques pérennes dans un contexte de données orales et visuelles Version: 0.5 Date: 26/05/2011 TGE-Adonis Numéro Document: ADONIS/SIAF/CINES-GM-0.5 Page: 1 Confidentialité: Public Projet TGE-Adonis ADONIS/SIAF/CINES-GM-0.5 Guide Méthodologique Formats Table des Matières CONTROLE DU DOCUMENT .............................................................................................................................. 6 AUTEURS & VERSIONS ............................................................................................................................................ 6 LISTE DE DISTRIBUTION POUR CETTE VERSION ........................................................................................................ 6 PREAMBULE .......................................................................................................................................................... 7 LA CONSERVATION A LONG TERME DE DOCUMENTS NUMERIQUES .......................................................................... 7 CONTEXTE DE L’ETUDE ........................................................................................................................................... 7 OBJECTIFS ............................................................................................................................................................... 8 CARACTERISTIQUES DES FORMATS NUMERIQUES .............................................................................. 10 DEFINITION D'UN FORMAT INFORMATIQUE ............................................................................................................ 10 FORMAT SPECIFIE .................................................................................................................................................. 10 FORMAT OUVERT .................................................................................................................................................. 11 FORMAT NORMALISE ............................................................................................................................................. 11 FORMAT PROPRIETAIRE ......................................................................................................................................... 12 FORMAT, ENCODAGE ET VERSION ......................................................................................................................... 12 HIERARCHIE DE STRUCTURE "INTRA-FORMAT" ..................................................................................................... 13 FORMAT CONTENEUR ............................................................................................................................................ 13 L’ENCAPSULATION D’UN FORMAT ......................................................................................................................... 13 CARACTERISTIQUES SPECIFIQUES AUX FORMATS AUDIOVISUELS ............................................... 14 DISTINCTION PREALABLE ENTRE FORMATS, CONTENEURS ET CODECS .................................................................. 14 LE CODAGE DE L’INFORMATION ............................................................................................................................ 14 Premier type de codage : captation du phénomène physique .......................................................................... 14 Deuxième type de codage : numérisation ......................................................................................................... 15 Principe .......................................................................................................................................................................... 15 Echantillonnage et quantification ................................................................................................................................... 15 Modulation par Impulsion et Codage (MIC) (PCM) ...................................................................................................... 15 Codec : définitions ........................................................................................................................................... 15 COMPRESSION ....................................................................................................................................................... 16 Utilité ............................................................................................................................................................... 16 Compression sans pertes (« Lossless ») ou compression avec pertes (« Lossy ») ............................................ 16 Compression et archivage pérenne .................................................................................................................. 16 Différents algorithmes de compression ............................................................................................................ 17 Objectifs de l’étude ........................................................................................................................................................ 17 Lois µ et A ..................................................................................................................................................................... 17 Compression « Psychologique » .................................................................................................................................... 17 Compression « Physiologique » ..................................................................................................................................... 18 Compressions basées sur l’exploitation des statistiques, des redondances, des écarts, des prédictions ........................ 19 Compressions mathématiques ........................................................................................................................................ 20 FORMATS ORIENTES DIFFUSION EN CONTINU ........................................................................................................ 20 Diffusion en continu (« vidéo streaming ») ..................................................................................................... 20 Formats spécifiques .......................................................................................................................................... 21 Ne pas confondre Formats et Protocoles. ........................................................................................................ 21 Incompatibilité avec l’archivage pérenne ........................................................................................................ 22 QUALITE ET FONCTIONNALITES DES FORMATS AUDIOVISUELS .............................................................................. 22 Qualité .............................................................................................................................................................. 22 En audio ......................................................................................................................................................................... 22 En vidéo ......................................................................................................................................................................... 23 Qualité de l’assemblage audio/vidéo .............................................................................................................................. 24 Fonctionnalités ................................................................................................................................................. 24 En audio ......................................................................................................................................................................... 24 Version: 0.5 Date: 26/05/2011 TGE-Adonis Numéro Document: ADONIS/SIAF/CINES-GM-0.5 Page: 2 Confidentialité: Public Projet TGE-Adonis ADONIS/SIAF/CINES-GM-0.5 Guide Méthodologique Formats En vidéo ......................................................................................................................................................................... 24 POSSIBILITE DE CONVERSION A PARTIR DE FORMATS AUTRES, PRINCIPALEMENT CEUX UTILISES PAR LA COMMUNAUTE ...................................................................................................................................................... 24 DEPENDANCES EXTERNES (LOGICIELS, SYSTEMES D'EXPLOITATION, MATERIELS …) ............................................ 24 Illustrations ...................................................................................................................................................... 25 Exemples de dépendances externes .................................................................................................................. 25 LECTEUR, EDITEUR ............................................................................................................................................... 25 CRITERES RETENUS DANS UN CONTEXTE DE DONNEES AUDIOVISUELLES PERENNES .......... 26 CRITERES CANDIDATS ........................................................................................................................................... 26 Formats numériques ........................................................................................................................................
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