Recherche avancée

Médias (0)

Mot : - Tags -/optimisation

Aucun média correspondant à vos critères n’est disponible sur le site.

Autres articles (47)

  • Librairies et logiciels spécifiques aux médias

    10 décembre 2010, par

    Pour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
    Il est important, après avoir installé apache2, mysql et php5, d’installer d’autres logiciels nécessaires dont les installations sont décrites dans les liens afférants. Un ensemble de librairies multimedias (x264, libtheora, libvpx) utilisées pour l’encodage et le décodage des vidéos et sons afin de supporter le plus grand nombre de fichiers possibles. Cf. : ce tutoriel ; FFMpeg avec le maximum de décodeurs et (...)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-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

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

Sur d’autres sites (8477)

  • Fragment shader does not show any colour when compiled with vs2013

    4 septembre 2019, par 5mayfive

    When compiled with vs2010, the fragment shader works, but when I compiled and run in vs 2013, it’s grey.

    My fragment shader converts the yuv texture into rgb

    Below is my fragment code

        const char *FProgram =
    
    "uniform sampler2D Ytex;\n"
    
    "uniform sampler2D Utex;\n"
    
    "uniform sampler2D Vtex;\n"
    
    "void main(void) {\n"
    
    "  vec4 c = vec4((texture2D(Ytex, gl_TexCoord[0]).r - 16./255.) * 1.164);\n"
    
    "  vec4 U = vec4(texture2D(Utex, gl_TexCoord[0]).r - 128./255.);\n"
    
    "  vec4 V = vec4(texture2D(Vtex, gl_TexCoord[0]).r - 128./255.);\n"
    
    "  c += V * vec4(1.596, -0.813, 0, 0);\n"
    
    "  c += U * vec4(0, -0.392, 2.017, 0);\n"
    
    "  c.a = 1.0;\n"
    
    "  gl_FragColor = c;\n"
    
    "}\n";
    

    

    

    

    

    
glClearColor(0, 0, 0, 0);
    

    
PHandle = glCreateProgram();
    
FSHandle = glCreateShader(GL_FRAGMENT_SHADER);
    

    

    

    
glShaderSource(FSHandle, 1, &FProgram, NULL);
    
glCompileShader(FSHandle);
    

    
glAttachShader(PHandle, FSHandle);
    
glLinkProgram(PHandle);
    

    

    
glUseProgram(PHandle);
    
glDeleteProgram(PHandle);
    
glDeleteProgram(FSHandle);

    This is my texture code, I receive linesize and yuv frame data from ffmpeg and make into texture. Everything works fine in VS 2010 computer, but when compiled and run in vs2013 computer, it is grey (black n white), no colour

        /* Select texture unit 1 as the active unit and bind the U texture. */
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, linesize1);
    
glActiveTexture(GL_TEXTURE1);
    
i = glGetUniformLocation(PHandle, "Utex");
    
glUniform1i(i, 1);  /* Bind Utex to texture unit 1 */
    
glBindTexture(GL_TEXTURE_2D, 1);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, width / 2, height / 2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, frame1);
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
    

    

    
/* Select texture unit 2 as the active unit and bind the V texture. */
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, linesize2);
    
glActiveTexture(GL_TEXTURE2);
    
i = glGetUniformLocation(PHandle, "Vtex");
    
glUniform1i(i, 2);  /* Bind Vtext to texture unit 2 */
    
glBindTexture(GL_TEXTURE_2D, 2);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, width / 2, height / 2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, frame2);
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
    

    

    
/* Select texture unit 0 as the active unit and bind the Y texture. */
    

    

    

    
glPixelStorei(GL_UNPACK_ROW_LENGTH, linesize0);
    
glActiveTexture(GL_TEXTURE0);
    
i = glGetUniformLocation(PHandle, "Ytex");
    
glUniform1i(i, 0);
    
glBindTexture(GL_TEXTURE_2D, 0);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, width, height, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, frame0);
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
    

    

    

    
glClear(GL_COLOR_BUFFER_BIT);
    

    
/* Draw image (again and again). */
    

    
glBegin(GL_QUADS);
    
glTexCoord2i(0, 0);
    
glVertex2i(-w / 2, h / 2);
    
glTexCoord2i(1, 0);
    
glVertex2i(w / 2, h / 2);
    
glTexCoord2i(1, 1);
    
glVertex2i(w / 2, -h / 2);
    
glTexCoord2i(0, 1);
    
glVertex2i(-w / 2, -h / 2);
    
glEnd();

  • Fragment shader does not show any colour when compiled with vs2013

    11 juin 2015, par 5mayfive

    When compiled with vs2010, the fragment shader works, but when I compiled and run in vs 2013, it’s grey.

    My fragment shader converts the yuv texture into rgb

    Below is my fragment code

        const char *FProgram =
    
    "uniform sampler2D Ytex;\n"
    
    "uniform sampler2D Utex;\n"
    
    "uniform sampler2D Vtex;\n"
    
    "void main(void) {\n"
    
    "  vec4 c = vec4((texture2D(Ytex, gl_TexCoord[0]).r - 16./255.) * 1.164);\n"
    
    "  vec4 U = vec4(texture2D(Utex, gl_TexCoord[0]).r - 128./255.);\n"
    
    "  vec4 V = vec4(texture2D(Vtex, gl_TexCoord[0]).r - 128./255.);\n"
    
    "  c += V * vec4(1.596, -0.813, 0, 0);\n"
    
    "  c += U * vec4(0, -0.392, 2.017, 0);\n"
    
    "  c.a = 1.0;\n"
    
    "  gl_FragColor = c;\n"
    
    "}\n";
    

    

    

    

    

    
glClearColor(0, 0, 0, 0);
    

    
PHandle = glCreateProgram();
    
FSHandle = glCreateShader(GL_FRAGMENT_SHADER);
    

    

    

    
glShaderSource(FSHandle, 1, &FProgram, NULL);
    
glCompileShader(FSHandle);
    

    
glAttachShader(PHandle, FSHandle);
    
glLinkProgram(PHandle);
    

    

    
glUseProgram(PHandle);
    
glDeleteProgram(PHandle);
    
glDeleteProgram(FSHandle);

    This is my texture code, I receive linesize and yuv frame data from ffmpeg and make into texture. Everything works fine in VS 2010 computer, but when compiled and run in vs2013 computer, it is grey (black n white), no colour

        /* Select texture unit 1 as the active unit and bind the U texture. */
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, linesize1);
    
glActiveTexture(GL_TEXTURE1);
    
i = glGetUniformLocation(PHandle, "Utex");
    
glUniform1i(i, 1);  /* Bind Utex to texture unit 1 */
    
glBindTexture(GL_TEXTURE_2D, 1);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, width / 2, height / 2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, frame1);
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
    

    

    
/* Select texture unit 2 as the active unit and bind the V texture. */
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, linesize2);
    
glActiveTexture(GL_TEXTURE2);
    
i = glGetUniformLocation(PHandle, "Vtex");
    
glUniform1i(i, 2);  /* Bind Vtext to texture unit 2 */
    
glBindTexture(GL_TEXTURE_2D, 2);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, width / 2, height / 2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, frame2);
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
    

    

    
/* Select texture unit 0 as the active unit and bind the Y texture. */
    

    

    

    
glPixelStorei(GL_UNPACK_ROW_LENGTH, linesize0);
    
glActiveTexture(GL_TEXTURE0);
    
i = glGetUniformLocation(PHandle, "Ytex");
    
glUniform1i(i, 0);
    
glBindTexture(GL_TEXTURE_2D, 0);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, width, height, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, frame0);
    
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
    

    

    

    
glClear(GL_COLOR_BUFFER_BIT);
    

    
/* Draw image (again and again). */
    

    
glBegin(GL_QUADS);
    
glTexCoord2i(0, 0);
    
glVertex2i(-w / 2, h / 2);
    
glTexCoord2i(1, 0);
    
glVertex2i(w / 2, h / 2);
    
glTexCoord2i(1, 1);
    
glVertex2i(w / 2, -h / 2);
    
glTexCoord2i(0, 1);
    
glVertex2i(-w / 2, -h / 2);
    
glEnd();

    Need guidance here, thanks in advance !

  • How to show an video while converting from one format to another format using ffmpeg in php.?

    15 avril 2014, par mani

    Presently i am writing a one application in php.
    which can be able to convert one format to another format using ffmpeg.

    Example : AVI to MP4

    Here my client wants

    "while converting he want's to see the ongoing converting video file
    like shown in standard video converting softwares"

    Is it possilble in PHP or is there any options available in ffmpeg

Navigation