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Médias (1)
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Bug de détection d’ogg
22 mars 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Video
Autres articles (27)
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Demande de création d’un canal
12 mars 2010, parEn fonction de la configuration de la plateforme, l’utilisateur peu avoir à sa disposition deux méthodes différentes de demande de création de canal. La première est au moment de son inscription, la seconde, après son inscription en remplissant un formulaire de demande.
Les deux manières demandent les mêmes choses fonctionnent à peu près de la même manière, le futur utilisateur doit remplir une série de champ de formulaire permettant tout d’abord aux administrateurs d’avoir des informations quant à (...) -
Les formats acceptés
28 janvier 2010, parLes commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
ffmpeg -codecs ffmpeg -formats
Les format videos acceptés en entrée
Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
Les formats vidéos de sortie possibles
Dans un premier temps on (...) -
Supporting all media types
13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
Sur d’autres sites (4332)
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Where can I download images/videos for all kind of pixel formats ?
15 janvier, par BukibarakI am developing a software that use FFMPEG
AVPixelFormat
for images and videos. I want it to be compatible with most common pixel formats.

Is there a website where I can download images/videos that have all kind of pixel formats for testing purpose (like RGBA, BGRA, YUV, Greyscale, ...) ?


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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 ?
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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 ?