Categories
Mastering Development

VNC screen live streaming with GStreamer

Intro I’ve been trying to capture vnc screen with GStreamer and then send it to rtp endpoint. I’ve already used a rfbsrc plugin, but it works unstable and there are first frames loss and freezing. Maybe there is an issue in my GStreamer pipeline : ‘–gst-debug=2’, ‘-vvv’, ‘rtpbin’, ‘name=rtpbin’, ‘rtp-profile=avpf’, ‘latency=100’, ‘rfbsrc’, `host=${rfbConfig.host}`, `port=${rfbConfig.port}`, ‘!’, […]

Categories
Mastering Development

ActiveRecord (without rails) create_database throws error ‘database does not exist’

For a new project I thought, why not skip rails and do more myself. Sadly I fail at a really simple problem. I found out already that I need to use ActiveRecord::Base.connection.create_database(‘backend’) after I set the connection with ActiveRecord::Base.establish_connection to create the database. Sadly the error I get is really annoying since it tells me […]

Categories
Development System & Network

Which load balancer is compatible with AMQP ( primarily Rabbit MQ ) protocol?

I am currently exploring Load Balancing which can load balance AMQP protocol requests. At the moment I am exploring whether envoy ( Which is one of the LB product ) There document says envoy can proxy any TCP protocol. I am looking to check whether envoy will be good fit for AMQP. Thats why I […]

Categories
Development

Heroku: This site can’t be reached

My heroku app cannot be accessed after a build. The logs show that the web server node and worker node both are listening. It’s a flask app run by gunicorn and it has 2 addons – newrelic and redistogo. Error: This site can’t be reached. appname.herokuapp.com’s server IP address could not be found. DNS_PROBE_FINISHED_NXDOMAIN Logs: […]

Categories
Development Linux Ubuntu

how to configure a custon rq worker to run under systemd

I am using rq, i have my own worker, namely worker.py #worker.py import os import redis from decouple import config from rq import Worker, Queue, Connection listen = [‘high’, ‘default’, ‘low’] password = config(‘REDIS_PASS’) conn = redis.from_url(config(‘REDIS_URL’)) if __name__ == ‘__main__’: with Connection(conn): worker = Worker(map(Queue, listen)) worker.work() from the command line, i run the […]

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Development

Why couldn’t a list from main thread be changed with the same values added from another thread?

Im trying to create a new Thread to retreive images from Firebase Cloud Storage and process them converting the files in byte[] for each one, and after that convert the bytes[] in Image’s to save them in a ArrayList<\Image>, good process i think… The thing is that im using an Interface between Libgdx Core classes […]

Categories
CSV Development

Writing to a single CSV file in parallel using multiprocessing

I’m trying to iterate in parallel over a large-ish (~2000×7) numpy array and test a few ML models, writing to a CSV file as I go to save RAM (rather than appending all results to a huge list and then writing once at the end). I’m doing it at the moment like this: pool = […]

Categories
Development Python

Python3: Why don’t 3 processes complete faster than 1?

In trying to understand Python’s multiprocessing better, I have adapted the code found here for a producer/consumer model. The producer will push integers onto a queue, and each consumer will take an integer off of the queue, convert it to a byte string, and encrypt it with a specified key. What I don’t understand is […]

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Development

Only Parallel, Queue, and IgnoreNew are supported right now. How to enable “stop the existing instance” [duplicate]

This question already has an answer here: Powershell New-ScheduledTaskSettingsSet 1 answer PowerShell unable to use enum MultipleInstances Steps to reproduce $a = New-ScheduledTaskSettingsSet -MultipleInstances StopExisting Expected behavior The task’s multiple instances policy is set to kill existing tasks before starting another instance. Actual behavior value “StopExisting” to type “Microsoft.PowerShell.Cmdletization.GeneratedTypes.ScheduledTask.MultipleInstancesEnum”. Error: “Unable to match the identifier […]

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Development

Not able to use all processors when using multiprocessing in python

I am working on python and trying to learn multiprocessing. When I tried the following code, it is supposed to run parallely but it is only using one processor. I am not able to understand the cause. What could be the issue, Why it is not engaging all the 4 cores of my pc. The […]