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FFmpeg Tricks

Repeat/loop Input Video

The -loop option is specific to the image file demuxer and gif muxer, so it can't be used for typical video files, but you can use the concat demuxer.

Concat demuxer

Make a text file. Contents of an example text file to repeat 4 times.

$ cat list.txt
file 'input.mp4'

Compile FFmpeg on Ubuntu

This basic guide supports Ubuntu Xenial Xerus 16.04 and will enable several external encoding and decoding libraries: libfaac (AAC encoder), libfdk-aac (AAC encoder), libmp3lame (MP3 encoder), libopencore-amr (AMR encoder/decoder), librtmp (for additional RTMP protocols), libtheora (Theora encoder), libvorbis (Vorbis encoder), libvpx (VP8 encoder/decoder), and libx264 (H.264 encoder). These are optional and may be omitted if desired. This guide will also install many filters (see the filter list in the [Filtering Guide][1].

Note: Copy and paste the whole code box for each step.

Preparation

1. Screenshot

Description (no more than one connected device):

Sets device in demo mode: hides your notifications, fixed clock, full battery, wifi level)
Takes a screenshot and saves it into captures directory. Also to your clipboard, so it's ready for Paste
Exits demo mode

Usage:

Download screenshot.sh
chmod +x screenshot.sh

What?

A one-liner that pulls an AAC stream, pipes it into ffmpeg which transcodes it to mp3, then pipes it into ezstream with your settings (in the xml file) which streams it your radio.

Dependencies

sudo apt-get install ficy ffmpeg ezstream

	intone=30
	inttwo=43
	intthree=67
	intfour=101
	intfive=115

	tmp=$(mktemp -d)

	ffmpeg -y -t $intone -i "$1" -vf framerate=40,scale=768x576 -vcodec libx264 -an $tmp/one.avi
	ffmpeg -y -t $inttwo -i "$2" -vf framerate=40,scale=768x576 -vcodec libx264 -an $tmp/two.avi

	#!/bin/bash

	rev="12"

	_log(){
	echo "$(date '+%Y-%m-%d %H:%M:%S') - ${streamid} - $1" >> /tmp/ffmpeg.log
	}

	_log_para(){
	echo "$1" \| fold -w 120 \| sed "s/^.*$/$(date '+%Y-%m-%d %H:%M:%S') - ${streamid} - = &/" >> /tmp/ffmpeg.log

	#! /bin/bash -x

	VBR="2500k"
	FPS="30"
	QUAL="medium"
	YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2"
	SOURCE="rtsp://xxx.xxx.xxx:554/Streaming/Channels/1"
	KEY="xxxxxxxxxxxxxxxx.xxx-xxx-qms4-emuc"

	#ffmpeg \

	raspberry pi livestream to YouTubeLive

	/boot/run.sh
	/boot/youtube.sh
	/etc/rc.local

	additional line to /etc/fstab

	#!/bin/bash
	# all mp4 files in this directory
	for file in ./*.mp4; do
	# create new mp3 name
	audio="${file%.mp4}.mp3"
	# if .mp4 is file and .mp3 does not exists
	if [ -f $file ] && [ ! -e $audio ]; then
	# ffmpeg will convert mp4 to mp3 with the strongest compressing (-q:a 9)
	# will show only panic logs
	ffmpeg -hide_banner -loglevel panic -i $file -vn -codec:a libmp3lame -q:a 9 $audio