Download a lot of videos from YouTube and merge it - example: talk by @viniciusteles about software problems (7 videos) at AgileBrazil2011

youtube-download-merge.sh

#!/bin/bash
###############################################################################
# This script downloads a lot of videos from YouTube and merge them into a    #
#  single .FLV file using mencoder.                                           #
#                                                                             #
# Requires Python, wget|curl and mencoder                                     #
#  Python and wget actually are installed on many GNU/Linux distributions and #
#  Mac OS (sorry, Windows' users)                                             #
#  To install mencoder in Ubuntu/Debian, just execute as root:                #
#                       aptitude install mencoder                             #
#                                                                             #
# License: GPLv2                                                              #
#                                                                             #
# Resources:                                                                  #
#  http://www.github.com/rg3/youtube-dl                                       #
#  http://www.mplayerhq.hu/DOCS/HTML/en/mencoder.html                         #
#                                                                             #
# Written by Álvaro Justen aka Turicas                                        #
#  Contact me: alvarojusten [no-spam_AT_] gmail [_DOT_no-spam] com            #
#              http://github.com/turicas                                      #
#              http://twitter.com/turicas                                     #
###############################################################################

echodate() {
	echo [$(date +"%Y-%m-%d %H:%m:%S")] $@
}

OUTPUT_FILENAME="vinicius-teles_2012-o-ano-em-que-a-terra-parou-porque-o-software-travou.flv"
VIDEO_CODES="cwXiF3EH-Tk BUqsqT9WKUI FS3wQ0YGzrw ODl7D2FyZNE aIge6vbEViE 1AAhf00ymEY U9-qFpvQ0tQ"
YOUTUBE_DL_URL="https://raw.github.com/rg3/youtube-dl/33d507f1fe828b186dec9b61ff4fc6b5fdcf42b2/youtube-dl"

echodate 'Downloading youtube-dl...'

if [ ! -z "$(which wget)" ]; then
	wget -c -t 0 "$YOUTUBE_DL_URL" -O youtube-dl
elif [ ! -z "$(which curl)" ]; then
	curl "$YOUTUBE_DL_URL" > youtube-dl
else
	echodate "You need either wget or curl to download youtube-dl. Exiting..."
	exit 1
fi
chmod +x youtube-dl

video_codes_flv=""
total_videos=0
for video_code in $VIDEO_CODES; do
	let total_videos="$total_videos + 1"
	video_codes_flv="$video_codes_flv $video_code.flv"
done

echodate 'Starting video downloads...'
i=0
for video_code in $VIDEO_CODES; do
	let i="$i + 1"
	echodate "Downloading video $i/$total_videos..."
	./youtube-dl "http://www.youtube.com/watch?v=$video_code"
done

echodate "Merging videos to '$OUTPUT_FILENAME'..."
merge_videos="mencoder -oac pcm -ovc copy -o "$OUTPUT_FILENAME" $video_codes_flv"
rm -rf "$OUTPUT"
if [ ! -z "$(which mencoder)" ]; then
	$merge_videos
else
	echodate "Sorry, you don't have mencoder installed. Install it runnig: sudo aptitude install mencoder"
	echodate "Then, run this command:"
	echo $merge_videos
	exit 2
fi