localvideowebencode



#!/bin/sh

# Origins:
#  http://diveintohtml5.org/video.html
#  http://camendesign.com/code/video_for_everybody
#  http://www.streaminglearningcenter.com/articles/so-you-want-to-get-to-know-h264.html

# Possible flashplayers:
#  http://www.internetmarketingnotes.com/2010/07/free-embeddable-flash-video-flv-players-for-commercial-use/

# 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)
# TODO: add --speech option, using mono, lower audio rate, and (when solved how) speex

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:
                        [modulus 16]
                             320x240 qvga         240p  432x240 wqvga
                             640x480 vga          480p  848x480 wvga
                                                  576p 1024x576 wsvga
                            1024x768 xga       hd 720p 1280x720 wxga
                        [modulus 8]
                             480x360 hvga     nhd 360p  640x360
                             800x600 svga
    -s, --size          Output size (ffmpeg): WIDTHxHEIGHT vga qcif etc.
                        (default: use input size)
    -a, --aspect        Display Aspect Ratio in melt format e.g. @16/9
                        (default: no aspect hinting)
    -r, --rate          Video framerate
                        (default: 25)
    -b, --bitrate       Video bitrate in bytes, with optional ISO suffix
                        (default: none)
    --h264profile       MPEG-4 AVC target profile (baseline medium)
                        (default: baseline)
    --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 max. 640x480 pixel size for widest compatibility
    (ie. square-pixel 640x360 or anamorphic svcd_ntsc_wide for 16:9)
  * Use a modulus 16 profile (qvga vga 480p 720p) for best compression.
  * Append these for single-mic speech: ac=1 ar=32000 ab=64k
  * Set bitrate for optimal MPEG-4/WebM bits-per-pixel ratio:
    + talking head: 0.1
    + high-motion or detailed content: 0.15
    (inspect result with mediainfo)

More info:  <http://camendesign.com/code/video_for_everybody>
            <http://www.streaminglearningcenter.com/>
            <http://en.wikipedia.org/wiki/HTML5_video>
EOF
}

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

# defaults
rate=25
h264profile=baseline

# parse cmdline options
TEMP="`getopt -s sh -o hp:s:a:r:b:t: -l help,profile:,size:,aspect:,rate:,bitrate:,h264profile:,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) rate="$2"; shift 2;;
        -b|--bitrate) bitrate="$2"; shift 2;;
        --h264profile) h264profile="$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

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=$(perl -e 'print pop @ARGV' $infiles)
[ -e "$infile" ] || exit1 "Input file missing!"

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

case "$profile" in
    320x240|qvga)
    _melt_in="-profile=quarter_pal${_melt_in:+ $_melt_in}"
    _melt="${size:-width=320 height=240}${_melt:+ $_melt}"
    ;;
    480x360|hvga)
    _melt_in="-profile=quarter_pal${_melt_in:+ $_melt_in}"
    _melt="${size:-width=480 height=360}${_melt:+ $_melt}"
    ;;
    640x480|vga)
    _melt_in="-profile=quarter_pal${_melt_in:+ $_melt_in}"
    _melt="${size:-width=640 height=480}${_melt:+ $_melt}"
    ;;
    800x600|svga)
    _melt_in="-profile=quarter_pal${_melt_in:+ $_melt_in}"
    _melt="${size:-width=800 height=600}${_melt:+ $_melt}"
    ;;
    1024x768|xga)
    _melt_in="-profile=quarter_pal${_melt_in:+ $_melt_in}"
    _melt="${size:-width=1024 height=768}${_melt:+ $_melt}"
    ;;
    240p|432x240|wqvga)
    _melt_in="-profile=atsc_720p_25${_melt_in:+ $_melt_in}"
    _melt="${size:-width=432 height=240}${_melt:+ $_melt}"
    ;;
    360p|640x360|nhd)
    _melt_in="-profile=atsc_720p_25${_melt_in:+ $_melt_in}"
    _melt="${size:-width=640 height=360}${_melt:+ $_melt}"
    ;;
    480p|848x480|wvga)
    _melt_in="-profile=atsc_720p_25${_melt_in:+ $_melt_in}"
    _melt="${size:-width=848 height=480}${_melt:+ $_melt}"
    ;;
    576p|1024x576|wsvga)
    _melt_in="-profile=atsc_720p_25${_melt_in:+ $_melt_in}"
    _melt="${size:-width=1024 height=576}${_melt:+ $_melt}"
    ;;
    720p|1280x720|wxga|hd)
    _melt_in="-profile=atsc_720p_25${_melt_in:+ $_melt_in}"
    ;;
    '')
    _melt="progressive=1 frame_rate_den=1${_melt:+ $_melt}"
    [ "25" != "$rate" ] || _melt="{_melt:+$_melt }frame_rate_num=$rate"
    ;;
    *) exit1 "Unknown profile \"$profile\" - please specify size and aspect directly.";;
esac

[ "25" = "$rate" ] || _melt="{_melt:+$_melt }frame_rate_num=$rate"

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

# TODO: When verified beneficial, add option real_time=-2
_melt_in="${_melt_in:+$_melt_in }-progress $sample"
_melt="$_melt ${bitrate:+vb=${bitrate}} ${size:+s=$size} ${aspect:+aspect=$aspect}"
_melt_audio="ab=96k"

## Theora/Vorbis/Ogg
melt -group $_melt_in $infiles -group $filters -consumer avformat:"$stem.ogg" f=ogg vcodec=libtheora $_melt acodec=libvorbis $_melt_audio $_melt_out

## H.264/AAC/MP4
[ -z "$bitrate" ] || melt -group $_melt_in $infiles -group $filters -consumer avformat:/dev/null properties=x264-medium-pass1 properties=x264-medium-$h264profile $_melt $_melt_out
melt -group $_melt_in $infiles -group $filters -consumer avformat:"$stem.mp4" ${bitrate:+pass=2} properties=x264-medium-$h264profile $_melt acodec=aac $_melt_audio $_melt_out
# TODO: drop qt-faststart when melt 0.9.2 is stable
mv "$stem.mp4" "$stem.mp4"~
qt-faststart "$stem.mp4"~ "$stem.mp4"
[ -f "$stem.mp4" ] && rm "$stem.mp4"~ || mv -f "$stem.mp4"~ "$stem.mp4"

## VP8/Vorbis/WebM
# TODO: use two-pass when supported by melt
melt -group $_melt_in $infiles -group $filters -consumer avformat:"$stem.webm" properties=webm $_melt $_melt_audio $_melt_out

## 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; codecs="avc1.42E01E, mp4a.40.2"' />
<source src="$stem.ogg"  type='video/ogg; codecs="theora, vorbis"' />
<source src="$stem.webm" type='video/webm; codecs="vp8, vorbis"' />
${flash:+<object width="$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.ogg">Ogg</a>,
open format <a href="$stem.webm">WebM</a>,
closed Format <a href="$stem.mp4">MP4</a>.
</p>
EOF