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Autres articles (102)
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MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
Modifier la date de publication
21 juin 2013, parComment changer la date de publication d’un média ?
Il faut au préalable rajouter un champ "Date de publication" dans le masque de formulaire adéquat :
Administrer > Configuration des masques de formulaires > Sélectionner "Un média"
Dans la rubrique "Champs à ajouter, cocher "Date de publication "
Cliquer en bas de la page sur Enregistrer -
MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 est la première version de MediaSPIP stable.
Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)
Sur d’autres sites (14622)
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pictor : use the correct logging context
29 juin 2013, par Luca Barbato -
mpeg12dec : simplify context duplication
4 novembre 2014, par Vittorio Giovara -
Rendering YUV420P ffmpeg decoded images on QT with OpenGL, only see black screen
17 février 2019, par Lucas ZanellaI’ve found this QT OpenGL Widget which should render a 420PYUV image on screen. I’m feeding a ffmpeg decoded buffer into its
paintGL()function but I see nothing. Neither noises or correct images, only a black screen. I’m trying to understand why.I want to exclude the possibilities of other things being wrong, but I need to be sure first that my code will produce anything. I
std::couted some bytes from the ffmpeg just to see if they were arriving and they were. So I should see at least some noise.Can you see anything wrong with my code that wouldn’t make it able to render images on screen ?
This is the widget that should output the image :
#include "XVideoWidget.h"
#include <qdebug>
#include <qtimer>
#include <iostream>
//自动加双引号
#define GET_STR(x) #x
#define A_VER 3
#define T_VER 4
//顶点shader
const char *vString = GET_STR(
attribute vec4 vertexIn;
attribute vec2 textureIn;
varying vec2 textureOut;
void main(void)
{
gl_Position = vertexIn;
textureOut = textureIn;
}
);
//片元shader
const char *tString = GET_STR(
varying vec2 textureOut;
uniform sampler2D tex_y;
uniform sampler2D tex_u;
uniform sampler2D tex_v;
void main(void)
{
vec3 yuv;
vec3 rgb;
yuv.x = texture2D(tex_y, textureOut).r;
yuv.y = texture2D(tex_u, textureOut).r - 0.5;
yuv.z = texture2D(tex_v, textureOut).r - 0.5;
rgb = mat3(1.0, 1.0, 1.0,
0.0, -0.39465, 2.03211,
1.13983, -0.58060, 0.0) * yuv;
gl_FragColor = vec4(rgb, 1.0);
}
);
//准备yuv数据
// ffmpeg -i v1080.mp4 -t 10 -s 240x128 -pix_fmt yuv420p out240x128.yuv
XVideoWidget::XVideoWidget(QWidget * parent)
{
// setWindowFlags (Qt::WindowFullscreenButtonHint);
// showFullScreen();
}
XVideoWidget::~XVideoWidget()
{
}
//初始化opengl
void XVideoWidget::initializeGL()
{
//qDebug() << "initializeGL";
std::cout << "initializing gl" << std::endl;
//初始化opengl （QOpenGLFunctions继承）函数
initializeOpenGLFunctions();
this->m_F = QOpenGLContext::currentContext()->functions();
//program加载shader（顶点和片元）脚本
//片元（像素）
std::cout << program.addShaderFromSourceCode(QOpenGLShader::Fragment, tString) << std::endl;
//顶点shader
std::cout << program.addShaderFromSourceCode(QOpenGLShader::Vertex, vString) << std::endl;
//设置顶点坐标的变量
program.bindAttributeLocation("vertexIn",A_VER);
//设置材质坐标
program.bindAttributeLocation("textureIn",T_VER);
//编译shader
std::cout << "program.link() = " << program.link() << std::endl;
std::cout << "program.bind() = " << program.bind() << std::endl;
//传递顶点和材质坐标
//顶点
static const GLfloat ver[] = {
-1.0f,-1.0f,
1.0f,-1.0f,
-1.0f, 1.0f,
1.0f,1.0f
};
//材质
static const GLfloat tex[] = {
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f
};
//顶点
glVertexAttribPointer(A_VER, 2, GL_FLOAT, 0, 0, ver);
glEnableVertexAttribArray(A_VER);
//材质
glVertexAttribPointer(T_VER, 2, GL_FLOAT, 0, 0, tex);
glEnableVertexAttribArray(T_VER);
//glUseProgram(&program);
//从shader获取材质
unis[0] = program.uniformLocation("tex_y");
unis[1] = program.uniformLocation("tex_u");
unis[2] = program.uniformLocation("tex_v");
//创建材质
glGenTextures(3, texs);
//Y
glBindTexture(GL_TEXTURE_2D, texs[0]);
//放大过滤，线性插值 GL_NEAREST(效率高，但马赛克严重)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
//创建材质显卡空间
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, 0);
//U
glBindTexture(GL_TEXTURE_2D, texs[1]);
//放大过滤，线性插值
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
//创建材质显卡空间
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width/2, height / 2, 0, GL_RED, GL_UNSIGNED_BYTE, 0);
//V
glBindTexture(GL_TEXTURE_2D, texs[2]);
//放大过滤，线性插值
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
//创建材质显卡空间
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width / 2, height / 2, 0, GL_RED, GL_UNSIGNED_BYTE, 0);
///分配材质内存空间
datas[0] = new unsigned char[width*height]; //Y
datas[1] = new unsigned char[width*height/4]; //U
datas[2] = new unsigned char[width*height/4]; //V
}
//刷新显示
void XVideoWidget::paintGL(unsigned char**data)
//void QFFmpegGLWidget::updateData(unsigned char**data)
{
std::cout << "painting!" << std::endl;
memcpy(datas[0], data[0], width*height);
memcpy(datas[1], data[1], width*height/4);
memcpy(datas[2], data[2], width*height/4);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texs[0]); //0层绑定到Y材质
//修改材质内容(复制内存内容)
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RED, GL_UNSIGNED_BYTE, datas[0]);
//与shader uni遍历关联
glUniform1i(unis[0], 0);
glActiveTexture(GL_TEXTURE0+1);
glBindTexture(GL_TEXTURE_2D, texs[1]); //1层绑定到U材质
//修改材质内容(复制内存内容)
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width/2, height / 2, GL_RED, GL_UNSIGNED_BYTE, datas[1]);
//与shader uni遍历关联
glUniform1i(unis[1],1);
glActiveTexture(GL_TEXTURE0+2);
glBindTexture(GL_TEXTURE_2D, texs[2]); //2层绑定到V材质
//修改材质内容(复制内存内容)
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width / 2, height / 2, GL_RED, GL_UNSIGNED_BYTE, datas[2]);
//与shader uni遍历关联
glUniform1i(unis[2], 2);
glDrawArrays(GL_TRIANGLE_STRIP,0,4);
qDebug() << "paintGL";
}
// 窗口尺寸变化
void XVideoWidget::resizeGL(int width, int height)
{
m_F->glViewport(0, 0, width, height);
qDebug() << "resizeGL "<code></iostream></qtimer></qdebug>Here’s a bit of code from my MainWindow :
MainWindow::MainWindow(QWidget *parent):
QMainWindow(parent)
{
FfmpegDecoder* ffmpegDecoder = new FfmpegDecoder();
if(!ffmpegDecoder->Init()) {
std::cout << "problem with ffmpeg decoder init" << std::endl;
} else {
std::cout << "fmmpeg decoder initiated" << std::endl;
}
XVideoWidget * xVideoWidget = new XVideoWidget(parent);
ffmpegDecoder->setOpenGLWidget(xVideoWidget);
mediaStream = new MediaStream(uri, ffmpegDecoder, videoConsumer);//= new MediaStream(uri, ffmpegDecoder, videoConsumer);
//...
}
void MainWindow::run()
{
mediaStream->receiveFrame();
}My main.cpp makes sure my window
run()method runs in the background.MainWindow w;
w.setFixedSize(1280,720);
w.show();
boost::thread mediaThread(&MainWindow::run, &w);
std::cout << "mediaThread running" << std::endl;If someone wants to view the entire code, please feel free to visit the commit I just did : https://github.com/lucaszanella/orwell/tree/bbd74e42bd42df685bacc5d51cacbee3a178689f
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