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Autres articles (40)
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XMP PHP
13 mai 2011, parDixit Wikipedia, XMP signifie :
Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...) -
Déploiements possibles
31 janvier 2010, parDeux types de déploiements sont envisageable dépendant de deux aspects : La méthode d’installation envisagée (en standalone ou en ferme) ; Le nombre d’encodages journaliers et la fréquentation envisagés ;
L’encodage de vidéos est un processus lourd consommant énormément de ressources système (CPU et RAM), il est nécessaire de prendre tout cela en considération. Ce système n’est donc possible que sur un ou plusieurs serveurs dédiés.
Version mono serveur
La version mono serveur consiste à n’utiliser qu’une (...) -
MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 is the first MediaSPIP stable release.
Its official release date is June 21, 2013 and is announced here.
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)
Sur d’autres sites (4574)
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Obtaining frames from IP Camera with low latency
5 février 2023, par Russ1337I am currently using this command to get frames from my RTSP stream and reading frames from stdout :


ffmpeg -nostdin -rtsp_transport tcp -i -pix_fmt bgr24 -an -vcodec rawvideo -f rawvideo -


However, I would like to get the same latency as when I see it via ffplay :


ffplay -fflags nobuffer -flags low_delay -tune zerolatency -framedrop -rtsp_transport tcp 


or when I play it via VLC Media > Open Network Stream with :network_caching=300ms.


I would like to know what other parameters I can use with my ffmpeg command to get an equivalent (or better) result compared to the ffplay command.


I have made references from : How to dump raw RTSP stream to file ?, Open CV RTSP camera buffer lag, How to pipe output from ffmpeg using python ?, bad ffmpeg performace compared to ffplay and VLC, How to minimize the delay in a live streaming with ffmpeg


My current implmentation :


FFMPEG_CMD = "ffmpeg -nostdin -rtsp_transport tcp -i -pix_fmt bgr24 -an -vcodec rawvideo -f rawvideo -".split(" ")
WIDTH = 2560
HEIGHT = 1440

process = subprocess.Popen(FFMPEG_CMD, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)

while True:
 raw_frame = process.stdout.read(WIDTH*HEIGHT*3)
 frame = np.frombuffer(raw_frame, np.uint8) 
 frame = frame.reshape((HEIGHT, WIDTH, 3))

 <do stuff="stuff" with="with" frame="frame"></do> show frame etc.>


Thanks for reading.



ffmpegcommand I am now using for < 1s latency.

ffmpeg -nostdin -flags low_delay -rtsp_transport tcp -i -pix_fmt bgr24 -an -vcodec rawvideo -f rawvideo -



Implementation with suggestion(s) from Answers :


import subprocess
import numpy as np

FFMPEG_CMD = "ffmpeg -nostdin -flags low_delay -rtsp_transport tcp -i -pix_fmt bgr24 -an -vcodec rawvideo -f rawvideo -".split(" ")
WIDTH = 2560
HEIGHT = 1440

process = subprocess.Popen(FFMPEG_CMD, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)

raw_frame = np.empty((HEIGHT, WIDTH, 3), np.uint8) 
frame_bytes = memoryview(raw_frame).cast("B")

while process.poll() is None:
 process.stdout.readinto(frame_bytes)
 frame = raw_frame.reshape((HEIGHT, WIDTH, 3))

 <do stuff="stuff" with="with" frame="frame"></do> show frame etc.>


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avcodec/libsvtav1 : give svtav1-params priority over avctx values
27 mars 2022, par James Almeravcodec/libsvtav1 : give svtav1-params priority over avctx values
If the svt equivalent option to an avctx AVOption is passed by the user
then it should have priority. The exception are fields like dimensions, bitdepth
and pixel format, which must match what lavc will feed the encoder after init.This addresses libsvt-av1 issue #1858.
Signed-off-by : James Almer <jamrial@gmail.com>
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using ffmpeg/ffprobe to create a waveform json using php
7 mai 2022, par edwardsmarkfI have many ogg & opus files on my server and need to generate json-waveform numeric arrays on an as-needed basis (example below).



recently i discovered the node based waveform-util which uses ffmpeg/ffprobe for rendering a JSON waveform and it works perfectly. i am undecided if having a node process constantly running is the optimum solution to my issue.



since ffmpeg seems to be able to handle anything i can throw at it, i wish to stick with an ffmpeg solution.



i have three questions :



1) is there a php equivalent ? i have found a couple that generate PNG images but not one that generates JSON-waveform numeric arrays



2) are there any significant advantages of going with the node-based solution rather than a php based solution (assuming there is a php based solution) ?



3) is there a way using CLI ffmpeg/ffprobe to generate a json-waveform ? i saw all the -show_ options (-show_data, -show_streams, -show_frames) but nothing looked like it produced what i am looking for.



the json-waveform needs to be in this format :



[ 0.0002, 0.001, 0.15, 0.14, 0.356 .... ]



thank you all.


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