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Exploiter des extraits d’un DVD en classe
+ Accueil du site > I. Fiches pratiques > 1.3. Produire / Créer / Publier > 1.3.3. Documents > Vidéo

Exploiter des extraits d’un DVD en classe

Mis en ligne le 21/11/2006

Contexte pédagogique : les élèves doivent travailler en autonomie sur de courts extraits d’un film.

Support du film : DVD

Mode opératoire technique :
1. Convertir le DVD en fichier-vidéo ;
2. Extraire du film des séquences vidéo ;
3. Extraire du film des images fixes.


1. Convertir le DVD en fichier-vidéo

Le contenu d’un DVD n’est pas exploitable directement : il faut ripper (i.e. convertir) les flux vidéo et audio en fichiers informatiques.

On trouve sur le web nombre de logiciels permettant cette opération : la requête « ripper dvd » dans google vous proposera Rippack, Ri4m, Fairuse

Nous utiliserons FaireUse Wizard.

Nous avons maintenant un fichier monfilm.avi au format Xvid (la version gratuite ne permet pas d’enregistrer en DivX).

Pour exploiter ce fichier, le codec Xvid doit être installé. Il faut le télécharger et l’installer.

Astuce : installez GSPOT pour identifier les codecs vidéo et audio d’un fichier (lien vers le site de GSPOT).

2. Extraire du film des séquences vidéo

La première idée qui vient à l’esprit est d’importer le fichier dans un logiciel de montage vidéo, de sélectionner les extraits et créer les clips...

Techniquement c’est possible mais il y a plus simple et plus rapide : extraire directement les extraits du film (sans recalcul).

Nous allons utiliser « le couteau suisse de la vidéo numérique », VirtualDub ( fiche framasoft, site, téléchargement d’une version francisée)

- Installer VirtualDub et lancer le logiciel ;
- Ouvrir le fichier monfilm.avi ;
- Lancer la lecture pour vérifier que tout fonctionne bien
- Cocher Vidéo>Copie de flux directe
- Cocher Audio>Audio de la source et Audio>Copie de flux directe
- Positionner les taquets au début et à la fin de la séquence à extraire
- Il ne reste plus qu’à enregistrer l’extrait : Fichier>

3. Extraire des image de la vidéo

Jusqu’à trés récemment, j’utilisais l’excellent logiciel ImageGrab de M. Paul Glagla (son site http://paul.glagla.free.fr/. Il permet la capture d’image une à une ou à la volée.

Mais il y a encore plus simple : c’est une fonctionnalité native de VLC (http://www.videolan.org/).

Pendant la lecture du flux vidéo (dvd ou fichier), il suffit de faire menu vidéo > capture d’écran.

Le fichier-image (au format png) est stocké dans MesImages (à modifier dans les préférences du logiciel).

Version à imprimer

FORUM


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