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Médias (1)
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The Great Big Beautiful Tomorrow
28 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Texte
Autres articles (90)
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Gestion des droits de création et d’édition des objets
8 février 2011, parPar défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;
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Support de tous types de médias
10 avril 2011Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)
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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 (5885)
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avformat/mov : Increase support for common encryption.
7 décembre 2017, par Jacob Trimbleavformat/mov : Increase support for common encryption.
Parse schm atom to get different encryption schemes.
Allow senc atom to appear in track fragments.
Allow 16-byte IVs.
Allow constant IVs (specified in tenc).
Allow only tenc to specify encryption (i.e. no senc/saiz/saio).
Use sample descriptor to detect clear fragments.
This doesn't support :
Different sample descriptor holding different encryption info.
- Only first sample descriptor can be encrypted.Encrypted sample groups (i.e. seig).
Non-'cenc' encryption scheme when using -decryption_key.
Signed-off-by : Jacob Trimble <modmaker@google.com>
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc> -
c++ avformat_open_input returns empty codec, width and height
27 février 2019, par Victor AkhlyninI haven’t ever used ffmpeg on my own laptop. All’s ok at work, but here I met an ugly problem : library works but helpless :)
Ubuntu 18.04, ffmpeg 4.1 (downloaded sources, ./configure, make, sudo make install), it seems to be ok.Application returns :
File /home/ahlininv/Desktop/video_example.mp4 is encodec with ’’ codec, w = 0, h = 0I ran it under debugger. If I set format to zero, pointer changes after calling avformat_open_input(&format, file, 0, &dict), so it works and maybe works correct.
Maybe it plays any role that compiler says that av_register_all, avcodec_register_all are deprecated, but I thought it’s not significant problem.
I tried to change version of ffmpeg (tried to install it with apt-get, version 3.somenumber is available), nothing changed.
I tried to run another video file (.avi), nothing changed, too.
Guys, help=) How to this file’s info correctly ?
main.cpp :
#include "filereader.h"
int main(int argc, char** argv) {
std::string filename = "/home/ahlininv/Desktop/video_example.mp4";
std::string codec;
int w, h;
bool open_ok = get_file_info(filename.c_str(), codec, w, h);
if (!open_ok) {
std::cout << "Failed to open file" << "\n";
return 1;
}
std::cout << "File " << filename << " is encoded with '" << codec << "' codec, w = " << w << ", h = " << h << "\n";
return 0;
}filereader.h :
#ifndef FILEREADER_H
#define FILEREADER_H
#include <string>
#include <iostream>
extern "C" {
#ifndef __STDC_CONSTANT_MACROS
#define __STDC_CONSTANT_MACROS
#endif
#include "libavcodec/avcodec.h"
#include <libavformat></libavformat>avformat.h>
#include <libavutil></libavutil>avutil.h>
}
bool get_file_info(const char* file, std::string& codec, int& w, int& h);
#endif // FILEREADER_H
</iostream></string>filereader.cpp
#include "filereader.h"
bool get_file_info(const char* file, std::string& codec, int& w, int& h)
{
codec = "";
w = h = 0;
av_register_all();
avcodec_register_all();
AVDictionary* dict = 0;
AVFormatContext* format = avformat_alloc_context();
char errbuf[256];
int r = avformat_open_input(&format, file, 0, &dict);
if (r!=0){
av_strerror(r, errbuf, sizeof(errbuf));
std::cout << "avformat_open_input error: " << errbuf << "\n";
}
if (r == AVERROR(EIO) || r == AVERROR(ENOEXEC) || !format)
return false;
for (size_t c = 0; c < format->nb_streams; ++c)
{
if (format->streams[c]->codecpar && format->streams[c]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
{
if (format->streams[c]->codecpar->codec_id != AV_CODEC_ID_NONE &&
format->streams[c]->codecpar->codec_id != AV_CODEC_ID_RAWVIDEO)
{
w = format->streams[c]->codecpar->width;
h = format->streams[c]->codecpar->height;
codec = avcodec_get_name(format->streams[c]->codecpar->codec_id);
}
}
}
avformat_close_input(&format);
return true;
}Compile :
g++ -o filereader main.cpp filereader.cpp -lavutil -lavformat -lavcodec -lavdevice -lz -lm -pthread -lswresample -lm -lz -I /usr/local/include/ -Wl,-rpath /usr/lib/x86_64-linux-gnu/
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ffmpeg : scale output cropped width/height doesn't work
10 septembre 2012, par Meir GerenstadtI'm trying to crop video frames with ffmpeg, and I would like to scale the cropped image automatically.
I saw an option at av filter : http://ffmpeg.org/libavfilter.html#SEC41./ffmpeg -i video.mp4 -vf "crop=640:480,scale=ow:oh" -f mpegts udp ://127.0.0.1:1234
I receive an error : Error when evaluating the expression 'oh'