Download YouTube videos with youtube-dl

Install & using

1. install youtube-dl

sudo apt-get update && sudo apt-get install youtube-dl

2. use this command to download files from YouTube

youtube-dl -o [name of output file] [YouTube URL]

3. To view all options youtube-dl, paste this in command line

man youtube-dl

To quit from manual press q key

Examples

1. Download classic flv type and save it as file.flv

youtube-dl -o file.flv "http://www.youtube.com/watch?v=Y54ABqSOScQ"

2. Download Full HD mp4 file and save it as file.mp4

youtube-dl -o file.mp4 -f 37 "http://www.youtube.com/watch?v=Y54ABqSOScQ"

This table from Wikipedia may be useful

Comparison of YouTube media types

Installing FFMPEG on CentOS with ATRPMS repo

1. Import Key
   

   rpm --import http://packages.atrpms.net/RPM-GPG-KEY.atrpms 

2. Create repo file
   

   vim /etc/yum.repos.d/atrpms.repo
   

   [atrpms]
   name=Fedora Core $releasever - $basearch - ATrpms
   baseurl=http://dl.atrpms.net/el$releasever-$basearch/atrpms/stable
   gpgkey=http://ATrpms.net/RPM-GPG-KEY.atrpms
   gpgcheck=1
   enabled=0
   
   [atrpms-testing]
   name=Fedora Core $releasever - $basearch - ATrpms
   baseurl=http://dl.atrpms.net/el$releasever-$basearch/atrpms/testing
   gpgkey=http://ATrpms.net/RPM-GPG-KEY.atrpms
   gpgcheck=1
   enabled=0

3. Install from Atrpms (example output)
   

   [root@computer ~]# yum --enablerepo=atrpms* install ffmpeg
   

   Loaded

NGINX location priority rules

NGINX is great. Fast, efficient, etc. But the “location” rules are a bit cryptic and not very well explained in the manuals.

There are 4 types of location rule, and are applied with the following priorities:

1: Exact matches
There can be only one exact match – the clue is in the name!
location = /foo/bar {
# exact match
}
2: High priority prefix
There can be more than one match, the longest one takes priority
location ^~ /foo {
# request beginning with /foo
}
3: Regex
There can be more than one match, the first one found takes priority. There are two variants
location ~ .foo$ {
# case-sensitive regex
}
location ~* .foo$ {
# case-insensitive regex
}
4: Low priority prefix
There can be more than one match, the longest one takes priority
location /foo {
# request beginning with /foo
}