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Video and audio encoding for playback in Android and iOS devices

This document aims to provide an easy way encode video optimized for playback in mobile devices that use the Android or the iOS operating systems.

libx264 is used for (single or two-pass) video encoding and libfdk_aac for audio encoding.

ffmpeg, libx264 and libfdk_aac settings are optimized for playback quality and compatibility on Android and iOS. There is extensive documentation and references for each of the settings used and contributions are very welcome :)

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FFmpeg

remove audio from video file

ffmpeg -i example.mp4 -c copy -an example_no_audio.mp4

extract audio track from video file without re-encoding

ffmpeg -i input.mp4 -vn -acodec copy audio_track.aac

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Yolo_mark on Ubuntu 16.04 LTS

clone repo

git clone https://github.com/AlexeyAB/Yolo_mark.git
cd Yolo_mark

add linux yolo mark command

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mounting iPhone storage in Ubuntu 16.04 LTS

check if your device was recognized correctly

$ dmesg | grep ipheth
[62051.385352] ipheth 1-5:4.2: Apple iPhone USB Ethernet device attached
[62051.385437] usbcore: registered new interface driver ipheth

create mounting point and make it writable (optional)

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dir1='image-builder-rpi'

dir2='gateway-image-builder-rpi'

IFS=$'\n'

for file in $(grep -Ilsr -m 1 '.' "$dir1"); do
    diff -q "$file" "${file/${dir1}/${dir2}}"
done

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# coding: utf8

"""
from http://orator.readthedocs.io/en/latest/migrations.html

orator.py is the default migration configuration file for the Orator ORM

this file uses the Config class, so we've decided to use sys.path.append() method at runtime to avoid having to specify
the PYTHONPATH environment variable, making required command line a bit more user friendly

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fluentd setup

system tweaks

• sudo vim /etc/security/limits.conf (append to EOF)

root soft nofile 65536 root hard nofile 65536

• soft nofile 65536

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#!/usr/bin/env python
import os
import sys
import base64
import json

# Add the lib directory to the path for Lambda to load our libs
sys.path.append(os.path.join(os.path.dirname(__file__), 'lib'))

WORLD_REGIONS = [

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# -*- coding: utf-8 -*-

import unittest

from app.lib.geo import generate_convex_hull


class GenerateConvexHullTest(unittest.TestCase):

    def test_generate_convex_hull_with_degenerate_input(self):

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dumping request and response headers from tcpdump in a human readable way:

sudo stdbuf -oL -eL /usr/sbin/tcpdump -A -s 10240 "tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)" | egrep -a --line-buffered ".+(GET |HTTP\/|POST )|^[A-Za-z0-9-]+: " | perl -nle 'BEGIN{$|=1} { s/.*?(GET |HTTP\/[0-9.]* |POST )/\n$1/g; print }'