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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
Autres articles (63)
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Soumettre améliorations et plugins supplémentaires
10 avril 2011Si vous avez développé une nouvelle extension permettant d’ajouter une ou plusieurs fonctionnalités utiles à MediaSPIP, faites le nous savoir et son intégration dans la distribution officielle sera envisagée.
Vous pouvez utiliser la liste de discussion de développement afin de le faire savoir ou demander de l’aide quant à la réalisation de ce plugin. MediaSPIP étant basé sur SPIP, il est également possible d’utiliser le liste de discussion SPIP-zone de SPIP pour (...) -
MediaSPIP Player : problèmes potentiels
22 février 2011, parLe lecteur ne fonctionne pas sur Internet Explorer
Sur Internet Explorer (8 et 7 au moins), le plugin utilise le lecteur Flash flowplayer pour lire vidéos et son. Si le lecteur ne semble pas fonctionner, cela peut venir de la configuration du mod_deflate d’Apache.
Si dans la configuration de ce module Apache vous avez une ligne qui ressemble à la suivante, essayez de la supprimer ou de la commenter pour voir si le lecteur fonctionne correctement : /** * GeSHi (C) 2004 - 2007 Nigel McNie, (...) -
List of compatible distributions
26 avril 2011, parThe table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)
Sur d’autres sites (6328)
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OpenCV returns an Array of All Zeros on video.read
19 janvier 2020, par Ikechukwu AnudeBelow is the relevant code
import cv2 as cv
import numpy as np
video = cv.VideoCapture(0) #tells obj to use built in camera\
#create a face cascade object
face_cascade =
cv.CascadeClassifier(r"C:\Users\xxxxxxx\AppData\Roaming\Python\Python36\site-
packages\cv2\data\haarcascade_frontalcatface.xml")
a = 1
#create loop to display a video
while True:
a = a + 1
check, frame = video.read()
print(frame)
#converts to a gray scale img
gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
#create the faces
faces = face_cascade.detectMultiScale(gray, scaleFactor=1.5, minNeighbors=5)
for(x, y, w, h) in faces:
print(x, y, w, h)
#show the image
cv.imshow('capturing', gray)
key = cv.waitKey(1) #gen a new frame every 1ms
if key == ord('q'): #once you enter 'q' the loop will be exited
break
print(a) #this will print the number of frames
#captures the first frame
video.release() #end the web cam
#destroys the windows when you are not defined
cv.destroyAllWindows()The code displays a video captured from my webcam camera. Despite that, OpevCV doesn’t seem to be processing any frames as all the frames look like this
[[0 0 0]
[0 0 0]
[0 0 0]
...
[0 0 0]
[0 0 0]
[0 0 0]]]which I assume means that they are empty.
This I believe is preventing the algorithm from being able to detect my face in the frame. I have a feeling that the issue lies in the ffmpeg codec, but I’m not entirely sure how to proceed even if that is the case.
OS : Windows 10
Language : PythonEDIT : The Frame is not empty but all the values in the array seem to be ’0’
Why is the frame empty and how can I get OpenCV to detect my face in the frame ?
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AVCodecContex returns zero for width and height in android
7 mars 2014, par WhoamiNot sure what was my mistake in the below code. I m trying with ffmpeg 0.11 and SDL2.0 in android.
QUESTION :
Why Width and Height of the CodecContext gives me always zero ?..int main(int argc, char *argv[])
{
int flags;
flags = SDL_INIT_VIDEO | SDL_INIT_TIMER;
if (SDL_Init (flags)) {
LOGD ("Could not intialize Video for SDL: %s \n", SDL_GetError());
}
else
LOGD (" SUCCESS: SDL_Init ");
// ffmpeg Register all services..
ffmpeg_register_all ();
pFrame = avcodec_alloc_frame ();
context = avformat_alloc_context();
err = avformat_open_input (&context, "rtsp:ip:port", NULL, NULL);
if ( err < 0) {
__android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Unable to open rtsp... ");
return -1;
}
for (i = 0; i < context->nb_streams; i++)
{
// Find the Decoder.
codec = avcodec_find_decoder(context->streams[i]->codec->codec_id);
if (codec->type == AVMEDIA_TYPE_VIDEO ) {
__android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Found Video Streaming.. ");
videoStreamIndex = i;
}
}
// Play RTSP
av_read_play(context);
// Get Codec Context.
pCodecCtx = context->streams[videoStreamIndex]->codec;
if ( pCodecCtx == NULL )
__android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "CodecCtx is NULL>>> ");
else
__android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "CodecCtx is <<<ok>>> ");
//Find the Decoder.
pCodec = avcodec_find_decoder (pCodecCtx->codec_id);
avcodec_open2 (pCodecCtx, pCodec, NULL);
int w = pCodecCtx->width; // Why me getting 0 ?
int h = pCodecCtx->height;
window = SDL_CreateWindow ("Test ffmpeg",SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, w, h, SDL_WINDOW_SHOWN|SDL_WINDOW_ALLOW_HIGHDPI);
// What this HIGHDPI Means ??
if ( window != NULL )
{
LOGD (" WINDOW CREATED.. , create Renderer ..");
renderer = SDL_CreateRenderer (window, -1, 0);
}
else
{
LOGD (" Invalid SDL Window ");
}
__android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Width and Height of PCodeccCtx.. %d .. %d " , w, h);
return 0;
}
</ok> -
AVCodecContex returns zero for width and height in android
17 février 2023, par WhoamiNot sure what was my mistake in the below code. I m trying with ffmpeg 0.11 and SDL2.0 in android.



QUESTION :
Why Width and Height of the CodecContext gives me always zero ?..



int main(int argc, char *argv[])
{

 int flags;
 flags = SDL_INIT_VIDEO | SDL_INIT_TIMER;

 if (SDL_Init (flags)) {
 LOGD ("Could not intialize Video for SDL: %s \n", SDL_GetError());
 }
 else 
 LOGD (" SUCCESS: SDL_Init ");

 // ffmpeg Register all services..
 ffmpeg_register_all (); 


 pFrame = avcodec_alloc_frame ();
 context = avformat_alloc_context();

 err = avformat_open_input (&context, "rtsp:ip:port", NULL, NULL);
 if ( err < 0) {
 __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Unable to open rtsp... ");

 return -1;
 }

 for (i = 0; i < context->nb_streams; i++)
 { 
 // Find the Decoder.
 codec = avcodec_find_decoder(context->streams[i]->codec->codec_id);
 if (codec->type == AVMEDIA_TYPE_VIDEO ) {
 __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Found Video Streaming.. ");
 videoStreamIndex = i;

 }
 }

 // Play RTSP
 av_read_play(context);

 // Get Codec Context.
 pCodecCtx = context->streams[videoStreamIndex]->codec;
 if ( pCodecCtx == NULL )
 __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "CodecCtx is NULL>>> ");
 else
 __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "CodecCtx is <<<ok>>> ");


 //Find the Decoder.
 pCodec = avcodec_find_decoder (pCodecCtx->codec_id);
 avcodec_open2 (pCodecCtx, pCodec, NULL);


 int w = pCodecCtx->width; // Why me getting 0 ? 
 int h = pCodecCtx->height;

 window = SDL_CreateWindow ("Test ffmpeg",SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, w, h, SDL_WINDOW_SHOWN|SDL_WINDOW_ALLOW_HIGHDPI);
 // What this HIGHDPI Means ??

 if ( window != NULL ) 
 {
 LOGD (" WINDOW CREATED.. , create Renderer ..");
 renderer = SDL_CreateRenderer (window, -1, 0); 
 }
 else
 {
 LOGD (" Invalid SDL Window "); 
 }
__android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Width and Height of PCodeccCtx.. %d .. %d " , w, h); 
 return 0;
}
</ok>

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