lyarinet

# Run the last command as root
sudo !!
# Serve current directory tree at http://$HOSTNAME:8000/
python -m SimpleHTTPServer
# Save a file you edited in vim without the needed permissions
:w !sudo tee %
# change to the previous working directory
cd -
# Runs previous command but replacing
^foo^bar

lyarinet

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

lyarinet

<?php
/** 
 *  Simple code for executing commands on a remote Linux server via SSH in PHP
 *
 *  @author Phil Kershaw (In collaboration with Philip Mott)
 *
 *  Note: ssh2_connect requires libssh2-php which is a non-standard PHP lib.
 *  Debian: apt-get install libssh2-php
 *  Redhat: yum install libssh2-php ???? I've no idea for redhat, sorry.
 */

lyarinet

Extract audio from a YouTube video file

ffmpeg -i INPUT.mp4 -ab 256k OUTPUT.mp3

Cut 3s length

ffmpeg -y -ss 00:00:03 -i INPUT.mp4 -codec copy OUTPUT.mp4

lyarinet

<?php
$timeout = 300; // 5 minutes
$time = time();
$ip = $_SERVER["REMOTE_ADDR"];
$file = "users.txt";
$arr = file($file);
$users = 0;

for ($i = 0; $i < count($arr); $i++){
    if ($time - intval(substr($arr[$i], strpos($arr[$i], "    ") + 4)) > $timeout){

lyarinet

# Don't use FFmpeg for metadata extraction. Use FFprobe.
# Its output is geared toward parsabilty.
# Container and stream information in JSON format:
ffprobe -show_format -print_format json 'Serenity - HD Trailer.mp4'
ffprobe -show_streams -print_format json 'Serenity - HD Trailer.mp4'

# Human-readable values:
ffprobe -show_format -pretty -print_format json 'Serenity - HD Trailer.mp4'

# Trim video to first 30 seconds, without transcoding.