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Autres articles (42)
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Qu’est ce qu’un éditorial
21 juin 2013, parEcrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
Vous pouvez personnaliser le formulaire de création d’un éditorial.
Formulaire de création d’un éditorial Dans le cas d’un document de type éditorial, les (...) -
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 -
Contribute to translation
13 avril 2011You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
MediaSPIP is currently available in French and English (...)
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Decoding H.264 individual nal units
24 septembre 2018, par madprogrammer2015I am currently sending individual NAL units across a network. These NAL units are generated by x264. Now is it possible to feed these NAL units individually into avcodec_decode_video2 ?
Or do I have to concatenate the nal units until they represent the same frame ? If thats the case then how is that done ?
I have also read that I might be able to receive the SPS and PPS packets. Then wait for at least one packet, and attempt to decode. Is this correct ?
Any advice that can be offered would be greatly appreciated
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Merge individual frame to video file using Opencv and FFmpeg
16 août 2022, par RohitI am trying to stack a individual frame to a video file using Opencv. I want to combine two different code together to make the individual frame.
Following code help me extract the individual frame


while True:
ret, frame=cap.read()
mask = object_detector.apply(frame)
_, mask = cv2.threshold(mask,254,255,cv2.THRESH_BINARY) 
contours,_ = cv2.findContours(mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
res = cv2.bitwise_and(frame,frame,mask=mask)
for cnt in contours:
 area = cv2.contourArea(cnt)
 if area>1000: 
 #print("Area of contour:", area)
 cv2.drawContours(frame, [cnt], -1, (0,255,0),2)
 cv2.imwrite("file%d.jpg"%count, frame)



And I attach the frame together separately using following code using ffmpeg command


ffmpeg -r 3 -i frame%03d.jpg -c:v libx264 -vf fps=25 -pix_fmt yuv420p video.mp4



I tried storing the individual frame in array, but it didn't work. It doesn't show any error, but pc crash.


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Merge individual frame to video file using Opencv
18 août 2022, par RohitI am trying to stack a individual frame to a video file using Opencv. I want to combine two different code together to make the individual frame.
Following code help me extract the individual frame,


fourcc = cv2.VideoWriter_fourcc(*'mp4v')
out = cv2.VideoWriter('file_data.mp4',fourcc,20 (1920,1080),False)
while True:
 ret, frame=cap.read()
 mask = object_detector.apply(frame)
 _, mask = cv2.threshold(mask,254,255,cv2.THRESH_BINARY) 
 contours,_ = cv2.findContours(mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
 res = cv2.bitwise_and(frame,frame,mask=mask)
 for cnt in contours:
 area = cv2.contourArea(cnt)
 if area>1000: 
 #print("Area of contour:", area)
 cv2.drawContours(frame, [cnt], -1, (0,255,0),2)
 cv2.imwrite("file%d.jpg"%count, frame)
 out.write(frame)
 if cv2.waitKey(1) and 0xFF == ord('q'):
 break



I tried storing the individual frame in array, but it didn't work. It doesn't show any error, but pc crash.




fps = 20,
,width = 1920
,height = 1080