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Médias (1)
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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
Autres articles (78)
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Déploiements possibles
31 janvier 2010, parDeux types de déploiements sont envisageable dépendant de deux aspects : La méthode d’installation envisagée (en standalone ou en ferme) ; Le nombre d’encodages journaliers et la fréquentation envisagés ;
L’encodage de vidéos est un processus lourd consommant énormément de ressources système (CPU et RAM), il est nécessaire de prendre tout cela en considération. Ce système n’est donc possible que sur un ou plusieurs serveurs dédiés.
Version mono serveur
La version mono serveur consiste à n’utiliser qu’une (...) -
Changer son thème graphique
22 février 2011, parLe thème graphique ne touche pas à la disposition à proprement dite des éléments dans la page. Il ne fait que modifier l’apparence des éléments.
Le placement peut être modifié effectivement, mais cette modification n’est que visuelle et non pas au niveau de la représentation sémantique de la page.
Modifier le thème graphique utilisé
Pour modifier le thème graphique utilisé, il est nécessaire que le plugin zen-garden soit activé sur le site.
Il suffit ensuite de se rendre dans l’espace de configuration du (...) -
Ajout d’utilisateurs manuellement par un administrateur
12 avril 2011, parL’administrateur d’un canal peut à tout moment ajouter un ou plusieurs autres utilisateurs depuis l’espace de configuration du site en choisissant le sous-menu "Gestion des utilisateurs".
Sur cette page il est possible de :
1. décider de l’inscription des utilisateurs via deux options : Accepter l’inscription de visiteurs du site public Refuser l’inscription des visiteurs
2. d’ajouter ou modifier/supprimer un utilisateur
Dans le second formulaire présent un administrateur peut ajouter, (...)
Sur d’autres sites (12483)
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avcodec/msrledec : implement vertical offset in 4-bit RLE
29 novembre 2016, par Daniel Verkampavcodec/msrledec : implement vertical offset in 4-bit RLE
The delta escape (2) is supposed to work the same in 4-bit RLE as in
8-bit RLE. This is documented in the MSDN Bitmap Compression page :
https://msdn.microsoft.com/en-us/library/windows/desktop/dd183383(v=vs.85).aspxThe unchecked modification of line is safe, since the loop condition
(line >= 0) will check it before any pixel data is written.Fixes ticket #5153 (output now matches ImageMagick for the provided sample).
Signed-off-by : Daniel Verkamp <daniel@drv.nu>
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Not able to link ffmpeg library in cython package
12 août 2020, par Sagar DonadkarI am using cython package to call Cpp API and in my cpp code i am using ffmpeg library when i try to build my code i got and linking issue
In header file add include ffmpeg header file to call ffmpeg library function


header file
#ifndef RECTANGLE_H
#define RECTANGLE_H
#include <iostream>

extern "C"
{
 #include "libavformat/avformat.h"
 #include "libavutil/dict.h"
}

using namespace std;

namespace shapes 
{
 class Rectangle {
 public:
 int x0, y0, x1, y1;
 Rectangle();
 Rectangle(int x0, int y0, int x1, int y1);
 ~Rectangle();
 int getArea();
 int ffmpegFile();
 void getSize(int* width, int* height);
 void move(int dx, int dy);
 };
}

#endif
</iostream>

Rectangle.Cpp file in ffmpegFile() i am using ffmpeg example code to test ffmpeg my code where i call mostly ffmpeg API



#include <iostream>
#include "Rectangle.hpp"

namespace shapes {
 

 // Default constructor
 Rectangle::Rectangle () {}

 // Overloaded constructor
 Rectangle::Rectangle (int x0, int y0, int x1, int y1) {
 this->x0 = x0;
 this->y0 = y0;
 this->x1 = x1;
 this->y1 = y1;
 }

 // Destructor
 Rectangle::~Rectangle () {}

 // Return the area of the rectangle
 int Rectangle::getArea () {
 return 10;
 }

 // Get the size of the rectangle.
 // Put the size in the pointer args
 void Rectangle::getSize (int *width, int *height) {
 (*width) = x1 - x0;
 (*height) = y1 - y0;
 }

 // Move the rectangle by dx dy
 void Rectangle::move (int dx, int dy) {
 this->x0 += dx;
 this->y0 += dy;
 this->x1 += dx;
 this->y1 += dy;
 }
 int Rectangle::ffmpegFile()
 {
 AVFormatContext *fmt_ctx = NULL;
 AVDictionaryEntry *tag = NULL;
 int ret = 0;
 char* filename = "D:\\Discovery.mp4";

 if ((ret = avformat_open_input(&fmt_ctx, filename, NULL, NULL)))
 return ret;

 if ((ret = avformat_find_stream_info(fmt_ctx, NULL)) < 0) {
 av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
 return ret;
 }

 while ((tag = av_dict_get(fmt_ctx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
 printf("%s=%s\n", tag->key, tag->value);

 avformat_close_input(&fmt_ctx);
 return ret;
 }
}
</iostream>

Rectangle.pxd file declaration for cpp file function and variable


cdef extern from "Rectangle.cpp":
 pass
cdef extern from "Rectangle.hpp" namespace "shapes":
 cdef cppclass Rectangle:
 Rectangle() except +
 Rectangle(int, int, int, int) except +
 int x0, y0, x1, y1
 int getArea()
 void getSize(int* width, int* height)
 void move(int, int)
 int ffmpegFile()


rect.pyx file i am calling cpp API form pyx file


# distutils: language = c++

from Rectangle cimport Rectangle

cdef class PyRectangle:
 cdef Rectangle c_rect # Hold a C++ instance which we're wrapping

 def __cinit__(self, int x0, int y0, int x1, int y1):
 self.c_rect = Rectangle(x0, y0, x1, y1)

 def get_area(self):
 return self.c_rect.getArea()

 def get_size(self):
 cdef int width, height
 self.c_rect.getSize(&width, &height)
 return width, height

 def move(self):
 print(self.c_rect.ffmpegFile())


setup.py
I provided pyx file and ffmpeg library path as well as include path


from setuptools import setup,Extension
from Cython.Build import cythonize 


directives={'linetrace':False, 'language_level':3}

setup(name = 'superfastcode', version = '1.0',
 description = 'Python Package with superfastcode C++ extension',
 ext_modules=cythonize([
 Extension(
 'demo',["rect.pyx"],
 include_dirs=['ffmpeg\\include'],)
 library_dirs=["ffmpeg\\lib"],
 libraries=["avcodec","avformat","avutil","swscale","avdevice","avfilter","postproc","swresample"]),
 
]))


getting below error


PS D:\SiVUE\Backend\Cython\demo> python setup.py build_ext --inplace
Compiling rect.pyx because it depends on .\Rectangle.pxd.
[1/1] Cythonizing rect.pyx
C:\python3.8\lib\site-packages\Cython\Compiler\Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: D:\SiVUE\Backend\Cython\demo\rect.pyx
 tree = Parsing.p_module(s, pxd, full_module_name)
running build_ext
building 'demo' extension
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\bin\HostX86\x86\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -I. -Iffmpeg\include -IC:\python3.8\include -IC:\python3.8\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\include" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt" /EHsc /Tprect.cpp /Fobuild\temp.win32-3.8\Release\rect.obj
rect.cpp
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\bin\HostX86\x86\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:ffmpeg\lib /LIBPATH:C:\python3.8\libs /LIBPATH:C:\python3.8\PCbuild\win32 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\lib\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\lib\um\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\ucrt\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x86" avcodec.lib avformat.lib avutil.lib swscale.lib avdevice.lib avfilter.lib postproc.lib swresample.lib /EXPORT:PyInit_demo build\temp.win32-3.8\Release\rect.obj /OUT:build\lib.win32-3.8\demo.cp38-win32.pyd /IMPLIB:build\temp.win32-3.8\Release\demo.cp38-win32.lib
 Creating library build\temp.win32-3.8\Release\demo.cp38-win32.lib and object build\temp.win32-3.8\Release\demo.cp38-win32.exp
rect.obj : error LNK2001: unresolved external symbol _avformat_open_input
rect.obj : error LNK2001: unresolved external symbol _av_log
rect.obj : error LNK2001: unresolved external symbol _avformat_close_input
rect.obj : error LNK2001: unresolved external symbol _avformat_find_stream_info
rect.obj : error LNK2001: unresolved external symbol _av_dict_get
build\lib.win32-3.8\demo.cp38-win32.pyd : fatal error LNK1120: 5 unresolved externals
error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.26.28801\\bin\\HostX86\\x86\\link.exe' failed with exit status 1120


Thank You


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Record a video conference application
11 août 2014, par Matin LotfalieeI want to record a video conference (e.g skype, oovoo, ...) with a program written in C#. I searched a lot about how to do this :
- Here suggests Windows Media Encoder, but none of their samples work correctly on my Win7. I installed the SDK but even the links to Microsoft are somehow broken or old.
- Here suggests creating a video stream from a series of screenshots using ffmpeg. but it is probably impossible to keep the audio,mic and screenshots synced.
- Here seems to be a great solution but it is not free...
Compression is not important to me because a video conference uses CPU a lot.
Can you help me find a good solution ?
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