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.

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

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
/** 
 *  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

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

# 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

# Get video duration in frames
	duration=$(ffmpeg -i [filename] 2>&1 | sed -n "s/.* Duration: \([^,]*\), start: .*/\1/p")
	fps=$(ffmpeg -i [filename] 2>&1 | sed -n "s/.*, \(.*\) tbr.*/\1/p")
	hours=$(echo $duration | cut -d":" -f1)
	minutes=$(echo $duration | cut -d":" -f2)
	seconds=$(echo $duration | cut -d":" -f3)
	FRAMES=$(echo "($hours*3600+$minutes*60+$seconds)*$fps" | bc | cut -d"." -f1)

# Start ffmpeg, use awk to flush the buffer and remove carriage returns
	ffmpeg -i [filename] [options] [outputfile] 2>&1 | awk '1;{fflush()}' RS='\r\n'>[errorlog] &

lyarinet

#!/bin/bash
# (C) Karl Mitchell 2017, GPL: https://www.gnu.org/licenses/gpl-3.0.en.html
# Best run once daily, e.g. using launchd or cron job, during quiet time
# Converts Channels DVR to a Plex & iOS-friendly m4v (h.264) format
# Pre-requisites:
#  HandBrakeCLI (video transcoding application)
# Optional pre-requisites:
#  MP4Box (part of GPAC, use MacPorts or similar) for marking commercials start/end as chapters
#  Curl and an IFTTT Maker Key for phone statusnotifications.
#  FFMPeg (a part of channels DVR, but you'll need to point to it) for commercial trimming

lyarinet

FFmpeg streaming

These are some ffmpeg command lines used when developing VHS dubbing controller.

HLS Stream (on Linux)

#!/bin/bash

# Stream a PAL 50i capture, cropped and de-interlaced using ffmpeg

lyarinet

#!/bin/bash

while true; do
	currTime=`date +%Y%m%d%H%M`
	if [ "$currTime" -ge 201507081658 -a "$currTime" -le 201507082300 ]; then
		echo "$currTime: Stream should be on. Start ffmpeg if the process does not exist"
		if [ "$(pidof ffmpeg)" ]; then
			echo "$currTime: ffmpeg already running."
			sleep 10
		else