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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
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Stereo master soundtrack
17 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Audio
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Elephants Dream - Cover of the soundtrack
17 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Image
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#7 Ambience
16 octobre 2011, par
Mis à jour : Juin 2015
Langue : English
Type : Audio
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#6 Teaser Music
16 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Audio
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#5 End Title
16 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Audio
Autres articles (8)
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Le profil des utilisateurs
12 avril 2011, parChaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...) -
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 (...)
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Contribute to a better visual interface
13 avril 2011MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.
Sur d’autres sites (2371)
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FFmpeg conversion RGB to YUV420 to RGB wrong result
29 août 2020, par sipwizI'm attempting to sort out a video encoding issue and along the way making sure I can convert between pixel formats with FFmpeg. I'm having a problem converting a dummy RGB24 bitmap to YUV420 and back again.


Below is my test program :


#include "Windows.h"

#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libavformat></libavformat>avio.h>
#include <libavutil></libavutil>imgutils.h>
#include <libswscale></libswscale>swscale.h>
#include <libavutil></libavutil>time.h>

#define WIDTH 32
#define HEIGHT 32
#define ERROR_LEN 128
#define SWS_FLAGS SWS_BICUBIC

char _errorLog[ERROR_LEN];
void CreateBitmapFile(LPCWSTR fileName, long width, long height, WORD bitsPerPixel, BYTE* bitmapData, DWORD bitmapDataLength);

int main()
{
 printf("FFmpeg Pixel Conversion Test\n");

 av_log_set_level(AV_LOG_DEBUG);

 int w = WIDTH;
 int h = HEIGHT;

 struct SwsContext* rgbToI420Context;
 struct SwsContext* i420ToRgbContext;

 rgbToI420Context = sws_getContext(w, h, AV_PIX_FMT_RGB24, w, h, AV_PIX_FMT_YUV420P, SWS_FLAGS, NULL, NULL, NULL);
 if (rgbToI420Context == NULL) {
 fprintf(stderr, "Failed to allocate RGB to I420 conversion context.\n");
 }

 i420ToRgbContext = sws_getContext(w, h, AV_PIX_FMT_YUV420P, w, h, AV_PIX_FMT_RGB24, SWS_FLAGS, NULL, NULL, NULL);
 if (i420ToRgbContext == NULL) {
 fprintf(stderr, "Failed to allocate I420 to RGB conversion context.\n");
 }

 // Create dummy bitmap.
 uint8_t rgbRaw[WIDTH * HEIGHT * 3];
 for (int row = 0; row < 32; row++)
 {
 for (int col = 0; col < 32; col++)
 {
 int index = row * WIDTH * 3 + col * 3;

 int red = (row < 16 && col < 16) ? 255 : 0;
 int green = (row < 16 && col > 16) ? 255 : 0;
 int blue = (row > 16 && col < 16) ? 255 : 0;

 rgbRaw[index] = (byte)red;
 rgbRaw[index + 1] = (byte)green;
 rgbRaw[index + 2] = (byte)blue;
 }
 }

 CreateBitmapFile(L"test-reference.bmp", WIDTH, HEIGHT, 24, rgbRaw, WIDTH * HEIGHT * 3);

 printf("Converting RGB to I420.\n");

 uint8_t* rgb[3];
 uint8_t* i420[3];
 int rgbStride[3], i420Stride[3];

 rgbStride[0] = w * 3;
 i420Stride[0] = w * h;
 i420Stride[1] = w * h / 4;
 i420Stride[2] = w * h / 4;

 rgb[0] = rgbRaw;
 i420[0] = (uint8_t*)malloc((size_t)i420Stride[0] * h);
 i420[1] = (uint8_t*)malloc((size_t)i420Stride[1] * h);
 i420[2] = (uint8_t*)malloc((size_t)i420Stride[2] * h);

 int toI420Res = sws_scale(rgbToI420Context, rgb, rgbStride, 0, h, i420, i420Stride);
 if (toI420Res < 0) {
 fprintf(stderr, "Conversion from RGB to I420 failed, %s.\n", av_make_error_string(_errorLog, ERROR_LEN, toI420Res));
 }

 printf("Converting I420 to RGB.\n");

 uint8_t* rgbOut[3];
 int rgbOutStride[3];

 rgbOutStride[0] = w * 3;
 rgbOut[0] = (uint8_t*)malloc((size_t)rgbOutStride[0] * h);

 int toRgbRes = sws_scale(i420ToRgbContext, i420, i420Stride, 0, h, rgbOut, rgbOutStride);
 if (toRgbRes < 0) {
 fprintf(stderr, "Conversion from RGB to I420 failed, %s.\n", av_make_error_string(_errorLog, ERROR_LEN, toRgbRes));
 }

 CreateBitmapFile(L"test-output.bmp", WIDTH, HEIGHT, 24, rgbOut, WIDTH * HEIGHT * 3);

 free(rgbOut[0]);

 for (int i = 0; i < 3; i++) {
 free(i420[i]);
 }

 sws_freeContext(rgbToI420Context);
 sws_freeContext(i420ToRgbContext);

 return 0;
}

/**
* Creates a bitmap file and writes to disk.
* @param[in] fileName: the path to save the file at.
* @param[in] width: the width of the bitmap.
* @param[in] height: the height of the bitmap.
* @param[in] bitsPerPixel: colour depth of the bitmap pixels (typically 24 or 32).
* @param[in] bitmapData: a pointer to the bytes containing the bitmap data.
* @param[in] bitmapDataLength: the number of pixels in the bitmap.
*/
void CreateBitmapFile(LPCWSTR fileName, long width, long height, WORD bitsPerPixel, BYTE* bitmapData, DWORD bitmapDataLength)
{
 HANDLE file;
 BITMAPFILEHEADER fileHeader;
 BITMAPINFOHEADER fileInfo;
 DWORD writePosn = 0;

 file = CreateFile(fileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); //Sets up the new bmp to be written to

 fileHeader.bfType = 19778; //Sets our type to BM or bmp
 fileHeader.bfSize = sizeof(fileHeader.bfOffBits) + sizeof(RGBTRIPLE); //Sets the size equal to the size of the header struct
 fileHeader.bfReserved1 = 0; //sets the reserves to 0
 fileHeader.bfReserved2 = 0;
 fileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER); //Sets offbits equal to the size of file and info header
 fileInfo.biSize = sizeof(BITMAPINFOHEADER);
 fileInfo.biWidth = width;
 fileInfo.biHeight = height;
 fileInfo.biPlanes = 1;
 fileInfo.biBitCount = bitsPerPixel;
 fileInfo.biCompression = BI_RGB;
 fileInfo.biSizeImage = width * height * (bitsPerPixel / 8);
 fileInfo.biXPelsPerMeter = 2400;
 fileInfo.biYPelsPerMeter = 2400;
 fileInfo.biClrImportant = 0;
 fileInfo.biClrUsed = 0;

 WriteFile(file, &fileHeader, sizeof(fileHeader), &writePosn, NULL);

 WriteFile(file, &fileInfo, sizeof(fileInfo), &writePosn, NULL);

 WriteFile(file, bitmapData, bitmapDataLength, &writePosn, NULL);

 CloseHandle(file);
}


The source bitmap is :




The output bmp after the two conversions is :




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unresolved external symbol of ffmpeg avutil.lib
2 mai 2016, par RichardFor some reason I can not get rid of this Linker error when using methods from ffmpeg libs !
I built the ffmpeg libs myself with msys64 and linked the resulting libs to my current project. As soon as I want to use them I get about 10 LNK errors.
I think I set all required linking right and also use the key word extern "C" without any success.
When running dumpbin.exe it lists all used symbols, so those libs should be ok...
Does anyone have a clue what´s going wrong ?#pragma once
extern "C"
{
#include
#include
#include
#include
#include
#include
#include
}
int main(int argc, char **argv[])
{
const char *output_type;
/* register all the codecs */
avcodec_register_all();
return 0;
}The error log looks like this :
error LNK2019 : unresolved external symbol av_frame_free referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
error LNK2019 : unresolved external symbol avcodec_register_all referenced in function main
error LNK2019 : unresolved external symbol avcodec_alloc_context3 referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
error LNK2019 : unresolved external symbol avcodec_open2 referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
error LNK2019 : unresolved external symbol avcodec_close referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
error LNK2019 : unresolved external symbol av_init_packet referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
error LNK2019 : unresolved external symbol av_packet_unref referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
error LNK2019 : unresolved external symbol avcodec_find_encoder referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
error LNK2019 : unresolved external symbol avcodec_encode_video2 referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
error LNK2019 : unresolved external symbol av_image_alloc referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
oVideoRendererApp\x64\Debug_64\ImagesToVideoRendererApp.exe : fatal error LNK1120 : 14 unresolved externals -
How to extract small video chunk with ffmpeg ?
3 décembre 2017, par Édouard LopezI’m writing a script to split a video in multiple small files based on subtitles timing. Each chunk illustrated how to sign a word LSF (French Sign Language).
However, some file are blank once extracted and when converted to
webmthey are0kb.Timing data
I extract the timing from a
.assfile to get this kind of file0:00:01.01 0:00:04.07
0:00:04.09 0:00:07.00
0:00:07.00 0:00:10.36
0:00:10.36 0:00:13.28First column is
start_time, second isend_timeExtraction
extract_word_chunk() {
ffmpeg \
-i "$INPUT_FILE" \
-ss "$start" \
-to "$end" \
-vcodec copy \
-acodec copy \
-loglevel error \
"$chunk" < /dev/null
}Conversion to webm
convert_to_webm() {
ffmpeg \
-y \
-i "$chunk" \
-acodec libvorbis \
-codec:v libvpx \
-b:v 192k \
-b:a 96k \
-minrate 128k \
-maxrate 256k \
-bufsize 192k \
-quality good \
-cpu-used 2 \
-deadline best \
-loglevel error \
"$chunk.webm" < /dev/null
}Output
# extract_word_chunk
ffmpeg \
-i 'assets/raw/partie 1: Apprendre 300 mots du quotidien en LSF.jauvert laura.mkv' \
-ss 0:00:01.01 \
-to 0:00:04.07 \
-vcodec copy \
-acodec copy \
-loglevel error \
assets/raw/0:00:01.01.mkv
# convert_to_webm
ffmpeg -y \
-i assets/raw/0:00:01.01.mkv \
-acodec libvorbis \
-codec:v libvpx \
-b:v 192k \
-b:a 96k \
-minrate 128k \
-maxrate 256k \
-bufsize 192k \
-quality good \
-cpu-used 2 \
-deadline best \
-loglevel error \
assets/raw/0:00:01.01.mkv.webmError
[buffer @ 0x16d8be0] Unable to parse option value "-1" as pixel format
Last message repeated 1 times
[buffer @ 0x16d8be0] Error setting option pix_fmt to value -1.
[graph 0 input from stream 0:0 @ 0x16e6fc0] Error applying options to the filter.Question
Only some chunk are blank/empty.
How do I prevent my video to be blank/empty ?
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