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Autres articles (50)
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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 -
Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
Sur d’autres sites (9112)
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Created a black frame movie using ffmpeg
28 juillet 2015, par Yunxiao Jiaffmpeg -i "data%04d_Projection_z_temperature_density.png" -r 47 -b 14M Projection_test_movie.mp4
This is the command i have used, the output seems fine, but when I open it with realplayer, it just plain back. Need Help, thank you !
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Use FFMPEG to Merge many frames into one video ?
14 novembre 2015, par SpoiledTechie.comWith a project I am working on, I am taking one video, extracting frames from within the middle, from 00:55:00 to 00:57:25. After I extract these images, I am modifying them via code and I then need to compile these images back into a video. To finish it off, I will then merge the video back into the original video.
Ive already pulled the frames from the video, modified them, but now I need to merge them back together into a video.
I used this question to check the format, but I am not getting the correct output.
Here is my current input to FFMPEG :
-r 24.97 -i "C:\Users\scott\AppData\Local\Temp\iOs91azj0.Bmp" -r 24.97 -i "C:\Users\scott\AppData\Local\Temp\iOs91azj1.Bmp" -r 24.97 -i "C:\Users\scott\AppData\Local\Temp\iOs91azj2.Bmp" -r 24.97 -i "C:\Users\scott\AppData\Local\Temp\iOs91azj3.Bmp" -r 24.97 -i "C:\Users\scott\AppData\Local\Temp\iOs91azj4.Bmp" -r 24.97 -i "C:\Users\scott\AppData\Local\Temp\iOs91azj5.Bmp" -r 24.97 -i "C:\Users\scott\AppData\Local\Temp\iOs91azj6.Bmp" -r 24.97 -i "C:\Users\scott\AppData\Local\Temp\iOs91azj7.Bmp" -r 24.97 -i "C:\Users\scott\AppData\Local\Temp\iOs91azj8.Bmp" -an -r 24.97 "C:\Users\scott\AppData\Local\Temp\ewELJdA8.mp4"
EDIT
My current output gives me a video that doesn’t play. So for some reason, the merging of frames isn’t the correct format and FFMPEG isn’t giving me a reasonal output to work with.
How do I merge frames together into a video ?
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video processing on android using ndk with ffmpeg and opencv is very slow
22 septembre 2017, par Zhiqiang LiI’m doing some video processing on android using ndk.
What I’m doing now is decode the video using ffmpeg, grab the frame, convert it to opencv mat, then overlay some images on it, then convert it back to avframe, encode it back to a video.
But it’s very slow ! It takes about 50 seconds to process a 480*480 video with 15 fps.
I tried to do this using opengl es, reading the result image using glReadPixels, but from what I understand, glReadPixels doesn’t really work on some devices. So I had to give it up.
As I understand, I have some very expensive operations in my current workflow,
- covert a AVFrame from yuv to bgr color space, then convert to opencv mat
- overlay a mat on another mat
- covert a opencv mat to AVFrame, then convert the frame from bgr to yuv space, then encode it into a video.
So, are there ways to improve my current workflow ?
I’m adding multithread feature, but only devices with multicore cup can benefit from that.