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Autres articles (42)
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Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir -
Encodage et transformation en formats lisibles sur Internet
10 avril 2011MediaSPIP transforme et ré-encode les documents mis en ligne afin de les rendre lisibles sur Internet et automatiquement utilisables sans intervention du créateur de contenu.
Les vidéos sont automatiquement encodées dans les formats supportés par HTML5 : MP4, Ogv et WebM. La version "MP4" est également utilisée pour le lecteur flash de secours nécessaire aux anciens navigateurs.
Les documents audios sont également ré-encodés dans les deux formats utilisables par HTML5 :MP3 et Ogg. La version "MP3" (...) -
Contribute to documentation
13 avril 2011Documentation is vital to the development of improved technical capabilities.
MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
To contribute, register to the project users’ mailing (...)
Sur d’autres sites (4977)
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how to add reference movie into ffmpeg psnr filter in codes (computing psnr)
15 octobre 2016, par user1317278I just want to find out how to use the psnr filter in ffmpeg in codes.
I have followed the codes stated in https://ffmpeg.org/ffmpeg-filters.html#psnr :
sprintf(args, "movie=ref_movie.avi [main];[main][ref] psnr=\"stats_file=stats.log\" [out]");
err = avfilter_graph_create_filter(&psnrCtx, psnrFilter, "psnr", args, NULL, m_filterGraph);
if ( err < 0 ) {
avfilter_graph_free(&m_filterGraph);
m_filterGraph = NULL;
return false; }But the error message return to me :
Option 'movie' not found
I also try this :
sprintf(args, "stats_file=stats.log");
err = avfilter_graph_create_filter(&psnrCtx, psnrFilter, "psnr", args, NULL, m_filterGraph);
if ( err < 0 ) {
avfilter_graph_free(&m_filterGraph);
m_filterGraph = NULL;
return false; }
err = avfilter_link(last_ctx, 0, psnrCtx, 0);
if ( err < 0 ) {
avfilter_graph_free(&m_filterGraph);
m_filterGraph = NULL;
return false;}
...
err = avfilter_graph_config(m_filterGraph, NULL);
if ( err < 0 ) {
avfilter_graph_free(&m_filterGraph);
m_filterGraph = NULL;
return false;
}but the error message return to me :
Input pad "reference" with type video of the filter instance "psnr" of psnr not connected to any source
I search psnr filter in codes but there is not much information about it. Can anyone help on this ?
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lavf/aiffdec : Default to full rate qcelp as QT does.
11 octobre 2016, par Carl Eugen Hoyos -
Raw extraction of frames from a movie
29 septembre 2016, par vkubickiI would like to extract images from a grayscale mj2 movie. Each pixel is encoded using 16 bits. Since this is a technical movie, I need to extract the value at each pixel without processing, as those values linearly map to a physical quantity (a heatmap from an infrared camera). I am using Scala, and I do not find any suitable solution for a direct extraction (either in Scala or in Java, but I am a beginner). Therefore I intend to use ffmpeg to extract individual frames on the disk, then load them as BufferedImage in Scala and process them.
Is this a good approach ? Which format should I use to avoid any transformation in the data ? I want each extracted frame to ba as "raw" as possible ? Is it possible to directly output a csv containing the aforementionned values ?