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Médias (1)
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La conservation du net art au musée. Les stratégies à l’œuvre
26 mai 2011
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (59)
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Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
Publier sur MédiaSpip
13 juin 2013Puis-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 -
Support de tous types de médias
10 avril 2011Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)
Sur d’autres sites (10324)
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Curator of the Samples Archive
13 mai 2011, par Multimedia Mike — GeneralRemember how I mirrored the world-famous MPlayerHQ samples archive a few months ago ? Due to a series of events, the original archive is no longer online. However, me and the people who control the mplayerhq.hu domain figured out how to make samples.mplayerhq.hu point to samples.multimedia.cx.
That means... I’m the current owner and curator of our central multimedia samples repository. Such power ! This should probably be the fulfillment of a decade-long dream for me, having managed swaths of the archive, most notably the game formats section.
How This Came To Be
If you pay any attention to the open source multimedia scene, you might have noticed that there has been a smidge of turmoil. Heated words were exchanged, authority was questioned, some people probably said some things they didn’t mean, and the upshot is that, where once there was one project (FFmpeg), there are now 2 projects (also Libav). And to everyone who has wanted me to mention it on my blog— there, I finally broke my silence and formally acknowledged the schism.
For my part, I was just determined to ensure that the samples archive remained online, preferably at the original samples.mplayerhq.hu address. There are 10 years worth of web links out there pointing into the original repository.
Better Solution
I concede that it’s not entirely optimal to host the repository here at multimedia.cx. While I can offer a crazy amount of monthly bandwidth, I can’t offer rsync (invaluable for keeping mirrors in sync), nor can the server provide anonymous FTP or allow me to offer accounts to other admins who can manage the repository.
The samples archive is also mirrored at samples.libav.org/samples. I understand that service is provided by VideoLAN. Right now, both repositories are known to be static. I’m open to brainstorms about how to improve the situation.
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"Could not demultiplex stream" in loading Video recorded by Opencv's VideoWriter
21 novembre 2020, par batumanMy program is



int main(){
 cout << "Start the process" << endl;
 cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");
 cout << "Camera connection done!" << endl;
 cv::Mat image, small;
 //Output video
 cv::Size S = cv::Size((int) vcap.get(CV_CAP_PROP_FRAME_WIDTH), (int) vcap.get(CV_CAP_PROP_FRAME_HEIGHT));
 int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));
 int fps = vcap.get(CV_CAP_PROP_FPS);
 cout << "fps " << fps << " ex " << ex << endl;
 cv::VideoWriter outputVideo;
 outputVideo.open("TEST.avi", ex/*CV_FOURCC('X', '2', '6', '4')*/, vcap.get(CV_CAP_PROP_FPS), S, true);
 if(!outputVideo.isOpened()){
 cout << "Could not open the output video for write" << endl;
 return -1;
 }

 for(;;){
 if(!vcap.read(image)){
 std::cout << "No frame" << std::endl;
 cv::waitKey(0);
 }

 cv::resize(image, small, image.size()/2, 0, 0 , cv::INTER_LINEAR);
 cv::imshow("Display", small);
 cv::waitKey(1);
 outputVideo.write(small);
 if(getkey() == '\n')
 break;
 }
 cout << "Camera release" << endl;
 outputVideo.release();
 vcap.release();
 image.release();
 small.release();
 return 0;
}
</int>


int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));</int>ex is 0 here.


I can record the TEST.avi, but can't be read by cv::VideoCapture vcap("TEST.avi") ; or VLC player or Videos in Ubuntu.
The error is
"Could not demultiplex stream".


If I changed to



outputVideo.open("TEST.avi", CV_FOURCC('X', '2', '6', '4'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('P','I','M','1'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('M', 'P', '4', '2'), vcap.get(CV_CAP_PROP_FPS), S, true);
etc.



all have same problem.



If I set



outputVideo.open("TEST.avi", CV_FOURCC('i', 'Y', 'U', 'V'), vcap.get(CV_CAP_PROP_FPS), S, true);



I have error as
Opencv: FFMPEG iYUV is not supported with codec id 14


For



outputVideo.open("TEST.avi", CV_FOURCC('M', 'J', 'P', 'G'), vcap.get(CV_CAP_PROP_FPS), S, true);


OpenCV Error: Assertion failed (img.cols == width && img.rows == height && chann
els == 3) in write, file /home/Softwares/opencv/opencv/modules/videoio/src/
cap_mjpeg_encoder.cpp, line 829
terminate called after throwing an instance of 'cv::Exception'
 what(): /home/Softwares/opencv/opencv/modules/videoio/src/cap_mjpeg_enco
der.cpp:829: error: (-215) img.cols == width && img.rows == height && channels =
= 3 in function write



What could be wrong ? Is that my FFMPEG has problem ?


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"Could not demultiplex stream" in loading Video recorded by Opencv's VideoWriter
16 juin 2016, par batumanMy program is
int main(){
cout << "Start the process" << endl;
cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");
cout << "Camera connection done!" << endl;
cv::Mat image, small;
//Output video
cv::Size S = cv::Size((int) vcap.get(CV_CAP_PROP_FRAME_WIDTH), (int) vcap.get(CV_CAP_PROP_FRAME_HEIGHT));
int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));
int fps = vcap.get(CV_CAP_PROP_FPS);
cout << "fps " << fps << " ex " << ex << endl;
cv::VideoWriter outputVideo;
outputVideo.open("TEST.avi", ex/*CV_FOURCC('X', '2', '6', '4')*/, vcap.get(CV_CAP_PROP_FPS), S, true);
if(!outputVideo.isOpened()){
cout << "Could not open the output video for write" << endl;
return -1;
}
for(;;){
if(!vcap.read(image)){
std::cout << "No frame" << std::endl;
cv::waitKey(0);
}
cv::resize(image, small, image.size()/2, 0, 0 , cv::INTER_LINEAR);
cv::imshow("Display", small);
cv::waitKey(1);
outputVideo.write(small);
if(getkey() == '\n')
break;
}
cout << "Camera release" << endl;
outputVideo.release();
vcap.release();
image.release();
small.release();
return 0;
}
</int>int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));</int>ex is 0 here.I can record the TEST.avi, but can’t be read by cv::VideoCapture vcap("TEST.avi") ; or VLC player or Videos in Ubuntu.
The error is"Could not demultiplex stream".If I changed to
outputVideo.open("TEST.avi", CV_FOURCC('X', '2', '6', '4'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('P','I','M','1'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('M', 'P', '4', '2'), vcap.get(CV_CAP_PROP_FPS), S, true);
etc.all have same problem.
If I set
outputVideo.open("TEST.avi", CV_FOURCC('i', 'Y', 'U', 'V'), vcap.get(CV_CAP_PROP_FPS), S, true);I have error as
Opencv: FFMPEG iYUV is not supported with codec id 14For
outputVideo.open("TEST.avi", CV_FOURCC('M', 'J', 'P', 'G'), vcap.get(CV_CAP_PROP_FPS), S, true);
OpenCV Error: Assertion failed (img.cols == width && img.rows == height && chann
els == 3) in write, file /home/Softwares/opencv/opencv/modules/videoio/src/
cap_mjpeg_encoder.cpp, line 829
terminate called after throwing an instance of 'cv::Exception'
what(): /home/Softwares/opencv/opencv/modules/videoio/src/cap_mjpeg_enco
der.cpp:829: error: (-215) img.cols == width && img.rows == height && channels =
= 3 in function writeWhat could be wrong ? Is that my FFMPEG has problem ?
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