localvideowebencode



#!/bin/sh
# Copyright © 2010-2014 Jonas Smedegaard <dr@jones.dk>
# Description: Recode a video into web-optimized format(s)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Depends: libav-tools melt ffmpegthumbnailer
#
# TODO: offer to skip rendering again if an output file exist already
# TODO: support --width and --height (resolving the other part from input/forced aspect ratio)
# TODO: support --formats (comma-separated, to allow e.g. excluding webm even if supported)

set -e

PRG=$(basename "$0")

showhelp() {
    cat <<EOF
Usage: $PRG [OPTION...] [--] [ARG=VALUE...] INPUTFILE... [ARG=VALUE...]
Encode video file in multiple web-optimized formats, and provide sample
html favoring open formats with optional non-JavaScript Flash fallback.

    -p, --profile       Video format - size with optional rate suffix,
                        delimited by @ (except for widescreen labels):
                        e.g. 848x480@25 480p25 wvga@25
                        (default: none)
    -s, --size:         Video frame size:
                        [modulus 16]
                             320x240 qvga
                             640x480 vga          480p  848x480 wvga
                                                  576p 1024x576 wsvga
                            1024x768 xga       hd 720p 1280x720 wxga
                        [modulus 8]
                                                  240p  424x240 wqvga
                             480x360 hvga     nhd 360p  640x360
                             800x600 svga
                        (default: use input size)
    -a, --aspect        Display Aspect Ratio in melt format e.g. @16/9
                        (default: no aspect hinting)
    -r, --rate          Video framerate - integer or fraction:
                        e.g. 15 1001/24000 25 1001/30000
                        (default: use input framerate)
    -b, --bitrate       Video bitrate in bytes, with optional ISO suffix
                        (default: none)
    --h264profile       MPEG-4 AVC target profile: baseline main high
                        (default: baseline)
    --h264preset        MPEG-4 AVC target preset: slow ultrafast etc.
                        (default: medium)
    --webmpreset        WebM target preset: 360p 720p 720p50_60 etc.
                        (default: profile-related or 360p)
    --audio             Audio style:
                                  channels  compress  normalize  limit
                          music    max 2                  X        X
                          speech       1        X         X        X
                          silence      0
                        (default: none - use input channel count)
    --stem              Stem of output filenames, optionally with path
                        (default: basename of last input file)
    -t, --title         Title used in html fallback graphics
                        (default: stem)
    --filter            Add melt filter (applied to all input files)
    --sample[=frame]    Limit output to a 150 frames sample from
                        beginning or optionally a later start frame
    -h, --help          This help text

Examples:
    $PRG -s qvga -t "Funny guy" intro.dv myvideo.dv
    $PRG -p 480p --stem funny -t "Funny guy" myvideo.dv

Options before input files are passed to melt producer, and after to
melt avformat consumer.

When video bitrate is set, 2-pass encoding is used for MPEG-4 output.

Hints:
  * Use square-pixel max. 480 width (vga 480p) for widest compatibility.
  * Use a modulus 16 profile (qvga vga 480p 720p) for best compression.
  * Set bitrate for optimal MPEG-4/WebM bits-per-pixel ratio:
    + talking head: 0.1
    + high-motion or detailed content: 0.15
    (inspect bits-per-pixel ratio with mediainfo)

More info:
<http://camendesign.com/code/video_for_everybody>
<http://www.streaminglearningcenter.com/articles/configuring-your-streaming-video-(for-newbies).html>
<http://en.wikipedia.org/wiki/HTML5_video>
<http://www.penguinproducer.com/2012/01/ladspa-noise-removal/>
<http://www.internetmarketingnotes.com/2010/07/free-embeddable-flash-video-flv-players-for-commercial-use/>
EOF
}

exit1() {
    response="${1:+Error: }${1:-Internal error!}"
    echo >&2 "$response"
    exit 1
}

# defaults
h264profile=baseline

# parse cmdline options
TEMP="`getopt -s sh -o hp:s:a:r:b:t: -l help,profile:,size:,aspect:,rate:,bitrate:,h264profile:,h264preset:,webmpreset:,audio:,stem:,title:,filter:,sample:: -n "$PRG" -- "$@"`" || exit1 "Internal getopt error."
eval set -- "$TEMP"
while true ; do
    case "$1" in
        -h|--help) showhelp; exit;;
        -p|--profile) profile="$2"; shift 2;;
        -s|--size) size="$2"; shift 2;;
        -a|--aspect) aspect="$2"; shift 2;;
        -r|--rate) framerate="$2"; shift 2;;
        -b|--bitrate) bitrate="$2"; shift 2;;
        --h264profile) h264profile="$2"; shift 2;;
        --h264preset) h264preset="$2"; shift 2;;
        --webmpreset) webmpreset="$2"; shift 2;;
        --audio) audio="$2"; shift 2;;
        --stem) stem="$2"; shift 2;;
        -t|--title) title="$2"; shift 2;;
        --filter) filters="${filters:+$filters }-filter $2"; shift 2
        while [ $# -gt 0 ] ; do
            case "$1" in
                *=*) filters="${filters:+$filters }$1"; shift;;
                *) break;;
            esac
        done
        ;;
        --sample) sample="in=${2:-0} out=$((${2:-0} + 150))"; shift 2;;
        --) shift; break;;
        *) exit1 "Internal error resolving options.";;
    esac
done

# Resolve if melt is version 0.9.2 or newer
# TODO: drop when melt 0.9.2 is stable
melt_recent=$(melt -query filter=loudness | grep -i R128)

while [ $# -gt 0 ] ; do
    case "$1" in
        *=*) _melt_in="${_melt_in:+$_melt_in }$1"; shift;;
        *) break;;
    esac
done

while [ $# -gt 0 ] ; do
    case "$1" in
        *=*) _melt_out="${_melt_out:+$_melt_out }$1"; shift;;
        *) infiles="${infiles:+$infiles }$1"; shift;;
    esac
done

if [ -z "$infiles" ]; then
    showhelp
    exit1 "Too few parameters!"
fi

# input filename (mandatory)
infile_first=$(perl -e 'print pop @ARGV' $infiles)
[ -e "$infile_first" ] || exit1 "Input file missing!"

# resolve stem and title (if not explicitly set)
stem=${stem:-$(basename "$infile_first" | perl -pe 's/\.[^.]*//')}
title=${title:-$stem}

case "$profile" in
    *@*)
    while read s r foo; do
        size="${size:-$s}"
        framerate="${framerate:-$r}"
    done << EOF
$(echo "$profile" | perl -F@ -anE 'say join " ", @F')
EOF
    ;;
    *p*)
    while read s r foo; do
        size="${size:-${s}p}"
        framerate="${framerate:-$r}"
    done << EOF
$(echo "$profile" | perl -Fp -anE 'say join " ", @F')
EOF
    ;;
    *)
    size="$profile"
    ;;
esac

case "$size" in
    qvga) size=320x240;;
    hvga) size=480x360;;
    vga) size=640x480;;
    svga) size=800x600;;
    xga) size=1024x768;;
    wqvga) size=424x240;;
    360p|nhd) size=640x360;;
    480p|wvga) size=848x480;;
    576p|wsvga) size=1024x576;;
    720p|wxga|hd) size=1280x720;;
esac

if [ -n "$size" ]; then
    while read w h foo; do
        width="${width:-$w}"
        height="${height:-$h}"
    done << EOF
$(echo "$size" | perl -Fx -anE 'say join " ", @F')
EOF
    if [ -z "$width" ] || [ -z "$height" ]; then
        exit1 "Failed to parse size \"$size\"."
    fi
fi

case "$framerate" in
    */*)
    while read d n foo; do
        framerate_den="${framerate_den:-$d}"
        framerate_num="${framerate_num:-$n}"
    done << EOF
$(echo "$framerate" | perl -Fx -anE 'say join " ", @F')
EOF
    ;;
    ?*)
    framerate_den=1
    framerate_num="$framerate"
    ;;
esac

while read w h r foo; do
    width_in="${width_in:-$w}"
    height_in="${height_in:-$h}"
    framerate_in="${framerate_in:-$r}"
done << EOF
$(mediainfo --Inform="Video;%Width% %Height% %FrameRate%" "$infile_first")
EOF

case "$h264profile" in
    baseline|main)
    _melt_h264="properties=x264-medium-$h264profile ${h264preset:+-vpre=libx264-$h264preset}"
    ;;
    high)
    _melt_h264="properties=x264-medium ${h264preset:+-vpre=libx264-$h264preset}"
    ;;
    *) exit1 "Unknown MPEG-4 AVC profile \"$h264profile\".";;
esac

if [ -n "${width:-$width_in}" ] && [ -n "${height:-$height_in}" ]; then
    _pixels="$((${width:-$width_in}*${height:-$height_in}))"
fi

if [ -n "$pixels" ] && [ $pixels -ge $((1024*768)) ]; then
    webmpreset="${webmpreset:-720p}"
fi

# default per-codec-channel bitrates
bitrate_vorbis=64
bitrate_aac=96

case "$audio" in
    music)
    channels=2
    # limit (i.e. avoid peaks "clipping")
    _melt_audio_filters="-filter ladspa.1077"
    ;;
    speech)
    channels=1
    bitrate_vorbis=48
    bitrate_aac=64
    # expand and compress (i.e. lower volume on silent and loud passages)
    _melt_audio_filters_early="-filter ladspa.1075 -filter ladspa.1073"
    # limit (i.e. avoid peaks "clipping")
    _melt_audio_filters="-filter ladspa.1077"
    ;;
    silence)
    channels=0
    ;;
    '')
    channels=$(avprobe -v warning -show_streams "$infile_first" | perl -ne 's/channels=// and print $_')
    ;;
    *) exit1 "Unknown audio style \"$audio\".";;
esac
[ $channels -le 2 ] || channels=2
[ $channels -gt 0 ] || channels=

# TODO: Check and fail if all needed tools are not available

# TODO: When verified beneficial, add option real_time=-2
melt="melt -progress"
_melt_in="${_melt_in:+$_melt_in }$sample"
_melt_video="progressive=1${framerate:+ frame_rate_den="$framerate_den" frame_rate_num="$framerate_num"}${bitrate:+ vb=$bitrate}${size:+ s=${width:+$width}x${height:+$height}}${aspect:+ aspect=$aspect}"
_melt_ogg="$_melt_video f=ogg vcodec=libtheora${bitrate:- qscale=5}"
_melt_h264="$_melt_video $_melt_h264${bitrate:- qscale=5}"
_melt_webm="$_melt_video vpre=libvpx-${webmpreset:-360p}"
_melt_audio="${channels:+ac=$channels}"
_melt_vorbis="$_melt_audio acodec=libvorbis ab=$(($channels*$bitrate_vorbis))k"
_melt_aac="$_melt_audio acodec=aac ab=$(($channels*$bitrate_aac))k"

# resolve EBU R128 audio normalizing
# TODO: normalize each infile separately when xml fed as infile keeps sync
if [ -n "$melt_recent" ] && [ -n "$channels" ]; then
    $melt -group $_melt_in $infiles -group $_melt_audio_filters_early -filter loudness -consumer xml:$stem.xml $_melt_audio video_off=1 all=1
    _melt_loudness="$(perl -ne 'm!<property name="results">([^<]+)</property>! and print $1' $stem.xml)"
fi

## Theora/Vorbis/Ogg
$melt -group $_melt_in $infiles -group ${channels:+$_melt_audio_filters_early${_melt_loudness:+ -filter loudness results="$_melt_loudness"} $_melt_audio_filters }$filters -consumer avformat:"$stem.ogv" $_melt_ogg $_melt_vorbis $_melt_out

## H.264/AAC/MP4
[ -z "$bitrate" ] || $melt -group $_melt_in $infiles -group $filters -consumer avformat:/dev/null properties=x264-medium-pass1 $_melt_h264 $_melt_out
$melt -group $_melt_in $infiles -group ${channels:+$_melt_audio_filters_early${_melt_loudness:+ -filter loudness results="$_melt_loudness"} $_melt_audio_filters }$filters -consumer avformat:"$stem.mp4" ${bitrate:+pass=2} $_melt_h264 $_melt_aac $_melt_out
if [ -z "$melt_recent" ]; then
    mv "$stem.mp4" "$stem.mp4"~
    qt-faststart "$stem.mp4"~ "$stem.mp4"
    [ -f "$stem.mp4" ] && rm "$stem.mp4"~ || mv -f "$stem.mp4"~ "$stem.mp4"
fi

## VP8/Vorbis/WebM
# TODO: use two-pass when supported by melt
$melt -group $_melt_in $infiles -group ${channels:+$_melt_audio_filters_early${_melt_loudness:+ -filter loudness results="$_melt_loudness"} $_melt_audio_filters }$filters -consumer avformat:"$stem.webm" properties=webm $_melt_webm $_melt_vorbis $_melt_out

# cleanup audio normalize hinting
rm -f $stem.xml

## JPEG preview
ffmpegthumbnailer -s0 -i "$stem.mp4" -o "$stem.jpg"

# resolve width and height from preview image
size=$(jpeginfo "$stem.jpg" | perl -ane 'print "$F[1]x$F[3]"')
width=$(echo "$size" | perl -Fx -ane 'print $F[0]')
height=$(echo "$size" | perl -Fx -ane 'print $F[1]')
heightplus=${height:+$(($height+4))}

# TODO: resolve flash player to use
[ -z "$flashplayer" ] || flash=yes

cat >"$stem.html" <<EOF
<!-- Video for Everybody, Kroc Camen of Camen Design -->
<video width="$width" height="$height" preload controls>
<source src="$stem.mp4"  type="video/mp4" />
<source src="$stem.webm" type="video/webm" />
<source src="$stem.ogv"  type="video/ogg" />
${flash:+<object width="$width" height="$heightplus" type="application/x-shockwave-flash" data="$flashplayer.swf">
<param name="movie" value="$flashplayer.swf" />
<param name="flashvars" value="image=$stem.jpg&amp;file=$stem.mp4" />
}<img src="$stem.jpg" width="$width" height="$height" alt="$title"
 title="No video playback capabilities, please download the video below" />
${flash:+</object>
}</video>
<p><strong>Download Video:</strong>
open format <a href="$stem.webm">WebM</a>,
open format <a href="$stem.ogv">Ogg</a>,
closed Format <a href="$stem.mp4">MPEG-4</a>.
</p>
EOF