Moorthi almoorthi

How to Add a Watermark to Video

FFMPEG filters provide a powerful way to programmatically enhance or alter videos, and itâ€™s fairly simple to add a watermark to a video using the overlay filter. The easiest way to install ffmpeg is to download a pre-built binary for your specific platform. Then you donâ€™t have to worry about including and installing all the right dependencies and codecs you will be using.

Once you have ffmpeg installed, adding a watermark is as easy as passing your existing source through an overlay filter like so:

ffmpeg -i test.mp4 -i watermark.png -filter_complex "overlay=10:10" test1.mp4

Basically, weâ€™re passing in the original video, and an overlay image as inputs, then passing it through the filter, and saving the output as test1.mp4.

Direct copy of pre-encoded file:

$ ffmpeg -i filename.mp4 -codec: copy -start_number 0 -hls_time 10 -hls_list_size 0 -f hls filename.m3u8

Sample config for 2 million web socket connection

    sysctl -w fs.file-max=12000500
    sysctl -w fs.nr_open=20000500
    # Set the maximum number of open file descriptors
    ulimit -n 20000000

    # Set the memory size for TCP with minimum, default and maximum thresholds 
 sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

Golang Workers / Job Queue

A running example of the code from:

This gist creates a working example from blog post, and a alternate example using simple worker pool.

TLDR: if you want simple and controlled concurrency use a worker pool.

Download Audio from YouTube

-i - ignore errors

-c - continue

-t - use video title as file name

--extract-audio - extract audio track

	//Values and definitions

	val x = 5 // constant, evaluated once
	def y = 5 // definition (function), evaluated at each call
	lazy val z = 5 // constant with lazy evaluation
	var v = 5 // variable, only use when really needed

	//Control constructs

	if (true) 1 else 2 // conditional _expression_, of type Int

	package main

	import (
	"encoding/json"
	"net/http"
	"net/url"

	"golang.org/x/net/html"
	"io"
	)

	#Recommended minimum configuration:
	acl manager proto cache_object
	acl localhost src 127.0.0.1/32
	acl to_localhost dst 127.0.0.0/8
	acl localnet src 0.0.0.0/8 192.168.100.0/24 192.168.101.0/24
	acl SSL_ports port 443
	acl Safe_ports port 80 # http
	acl Safe_ports port 21 # ftp
	acl Safe_ports port 443 # https
	acl Safe_ports port 70 # gopher

	# brew install ffmpeg --with-fdk-aac

	find . -iname "*.mp3" \| while read f
	do
	ffmpeg -i "$f" -acodec libfdk_aac -f ipod "${f:r}".m4r
	done