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Autres articles (53)
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Automated installation script of MediaSPIP
25 avril 2011, parTo overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
The documentation of the use of this installation script is available here.
The code of this (...) -
ANNEXE : Les plugins utilisés spécifiquement pour la ferme
5 mars 2010, parLe site central/maître de la ferme a besoin d’utiliser plusieurs plugins supplémentaires vis à vis des canaux pour son bon fonctionnement. le plugin Gestion de la mutualisation ; le plugin inscription3 pour gérer les inscriptions et les demandes de création d’instance de mutualisation dès l’inscription des utilisateurs ; le plugin verifier qui fournit une API de vérification des champs (utilisé par inscription3) ; le plugin champs extras v2 nécessité par inscription3 (...)
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Encoding and processing into web-friendly formats
13 avril 2011, parMediaSPIP automatically converts uploaded files to internet-compatible formats.
Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
All uploaded files are stored online in their original format, so you can (...)
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OpenCV Threading Capture Loses Connection to IP Camera
27 janvier 2021, par David López DíazI have a surveillance program that opens 16 threads to check on to 16 different cameras with live video, but when after some time (20/30 seconds) cameras starts to lose frames and I need to reconnect them.


The thing is that if I only open 10 streams at once it might lose a frame from time to time, but if I open 16 streams it begins to fail every 20 seconds or so.


I've checked system params, and CPU doesnt go more than 50% and RAM is on 4GB, so this doesnt look like the problem.
Also I've checked the network and it's fine, no delay and no packet loss.


Sometime I get
error while decoding MB 8 7, bytestream -5


This is the thread I use to get the streams.


"""
 Class that continuously gets frames from a VideoCapture object
 with a dedicated thread.
 """
 def __init__(self, idcam,ipcamara, user, passwd,resolucionh,resolucionw):
 self.id = idcam
 self.ip = ipcamara
 self.user = user
 self.passwd = passwd
 self.Q =[]
 self.scale_percent = 50
 self.i = 0

 def start(self):
 self.conectar()
 Thread(target=self.get, args=()).start()
 return self

 def get(self):

 while True:
 if(self.stream.isOpened() and self.online):
 (status, preFrame) = self.stream.read()
 if(status):
 self.frame = (preFrame)
 else:
 self.stream.release()
 self.online = False
 else:
 graba_log('Camara '+str(self.id),'Desconexion')
 self.conectar()
 time.sleep(1)

 def conectar(self):
 print('Iniciando conexion con camara '+str(self.id))
 self.stream = cv2.VideoCapture("rtsp://"+self.user+":"+self.passwd+"@"+self.ip)
 self.online = True
 def recuperarFrame(self):
 return self.frame ```



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What is video timescale, timebase, or timestamp in ffmpeg ? [on hold]
11 avril 2017, par Please HelpThere does not seem to be any explanation online as to what these are. People talk about them a lot. I just want to know what they are and why they are significant. Using -video_track_timescale, how would I determine a number for it ? Is it random ? Should it be 0 ?
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ffmpeg showwaves - Change color of waveform on top of an image
15 août 2020, par Grant SYNKOPI need help with ffmpeg.



I wrote this code :



@echo off 
for %%F in (*.opus *.ogg) do 
( 
 ffmpeg -y -i "%%F" -loop 1 -i "default.jpg" -filter_complex " 
 [0:a]showwaves=s=2560x1440:mode=cline:r=30,colorkey=0x000000:0.01:0.1,format=yuva420p[v];
[1:v][v]overlay[outv]" -map "[outv]" -pix_fmt yuv420p -map 0:a -vcodec libvpx-vp9 -lossless 1 -speed 8 -acodec copy -shortest "%%~nF.webm" 
)




What it does is that for each .opus or .ogg audio file, it'll output a video with a default.jpg background image (which is completely white) and a waveform on top of it, with the audio playing.
Problem is, I would change the color of the waveform to black, but I don't understand how colorkey works even after reading the documentation...



Basically, I want to obtain something like this (but the waveform being in black) : https://www.youtube.com/watch?v=k9arneFijG8



Thanks in advance.