Here is an update transcode script that changes the following, this
script attempts to setup a proper transcode command line to produce
a .mpg file that will play properly on mvpmc.
Version 0.51 11/09/2007
Changes:
Added code to use audio bitrate from original when possible
Added code to use audio srate from original when possible
Added code to remove audio preload - this seems to cause mvpmc to be
out of sync on *all* bitrates, not having the preload appears to
make the audio sync be wrong with mplayer - but we aren't using
mplayer for this are we.
Removed extra crap from mencoder sampling code lines
Renames .mpg audio only transcode files to the original filename and
renames the original to $1.orig.
mplayer -identify only works with mplayer - not with mencoder - not sure
whoever added this option thought it out, and mplayer does not
appear to have a way to redirect to nowhere, so cannot be
easily used.
Added -lameopts and removed some lavcopts for audio that were basically
being ignored.
Changed scale to be in the y rather than the x (640) and use 400 rather
than 480, I found mencoder to sometimes decide to expand to 484
when using x (640) and autoaspect as the setting and 484 won't play
on mvpmc, this was on some different sized videos.
Set a lower audio srate and audio bps as some lower audio rates fail -
ie a srate of 12000 fails to produce any sound, other rates might
work but only basic testing was done to conform that 22050 worked.
#!/bin/bash
# Written by: Roger Heflin ([EMAIL PROTECTED])
#
# script to convert a video file into a form that is playable on a
# mvpmc box, used inside of MYTHTV to convert HD signals and other
# files into forms that will work on the MVPMC box without using VLC
#
# Version 0.51 11/09/2007
# Changes:
# Added code to use audio bitrate from original when possible
# Added code to use audio srate from original when possible
# Added code to remove audio preload - this seems to cause mvpmc to be
# out of sync on *all* bitrates, not having the preload appears to
# make the audio sync be wrong with mplayer - but we aren't using
# mplayer for this are we.
# Removed extra crap from mencoder sampling code lines
# Renames .mpg audio only transcode files to the original filename and
# renames the original to $1.orig.
# mplayer -identify only works with mplayer - not with mencoder - not sure
# whoever added this option thought it out, and mplayer does not
# appear to have a way to redirect to nowhere, so cannot be
# easily used.
# Added -lameopts and removed some lavcopts for audio that were basically
# being ignored.
# Changed scale to be in the y rather than the x (640) and use 400 rather
# than 480, I found mencoder to sometimes decide to expand to 484
# when using x (640) and autoaspect as the setting and 484 won't play
# on mvpmc, this was on some different sized videos.
# Set a lower audio srate and audio bps as some lower audio rates fail -
# ie a srate of 12000 fails to produce any sound, other rates might
# work but only basic testing was done to conform that 22050 worked.
#
# Version 0.5 8/10/2007
# Original script.
#
export DEBUG=1
export srate=48000
export abitrate=320
# -vf sacle=720:480 -vf expand=576:432
if [ ! -s "$1" ] ; then
echo "$1 has 0 size"
exit 0
fi
if [ -L "$1" ] ; then
echo "$1 is a link - this program will not copy and replace properly with a
link"
exit 0
fi
if [ -f "$1" ] ; then
export TMPFILE=`/bin/mktemp`
if [ $DEBUG == 1 ] ; then
echo "Temp file is $TMPFILE"
fi
#
# sample in several places
# -ovc copy fails to check for audio with DX50 file ... but appears to be fine
with
# everything else
mencoder -of mpeg -frames 5 -vf cropdetect -oac mp3lame -ovc raw -o /dev/null
$1 2>&1 > ${TMPFILE}
# mencoder -ss 5 -of mpeg -frames 5 -vf cropdetect -oac copy -ovc raw -o
/dev/null $1 2>&1 > ${TMPFILE}.1
# mencoder -ss 10 -of mpeg -frames 5 -vf cropdetect -oac copy -ovc raw -o
/dev/null $1 2>&1 > ${TMPFILE}.2
# mencoder -ss 15 -of mpeg -frames 5 -vf cropdetect -oac copy -ovc raw -o
/dev/null $1 2>&1 > ${TMPFILE}.3
else
echo "Usage: ${0} <videofiletoconvert>"
echo " "
exit -1
fi
export oldfile=$1
export newfile=${1}.tmp
if [ $DEBUG == 1 ] ; then
echo "Oldfile= $oldfile newfile= $newfile"
fi
#
# success: format: 0 data: 0x0 - 0x5ae43e0c
#TS file format detected.
#DEMUX OPEN, AUDIO_ID: -1, VIDEO_ID: -1, SUBTITLE_ID: -1,
#PROBING UP TO 2000000, PROG: 0
#VIDEO MPEG2(pid=49)AUDIO A52(pid=52) NO SUBS (yet)! PROGRAM N. 1
#Opened TS demuxer, audio: 2000(pid 52), video: 10000002(pid 49)...POS=564
#VIDEO: MPEG2 1920x1080 (aspect 3) 29.970 fps 65000.0 kbps (8125.0 kbyte/s)
#[V] filefmt:29 fourcc:0x10000002 size:1920x1080 fps:29.97 ftime:=0.0334
#Opening audio decoder: [liba52] AC3 decoding with liba52
#AC3: 2.0 (stereo) 48000 Hz 384.0 kbit/s
#AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
#Selected audio codec: [a52] afm:liba52 (AC3-liba52)
export vtype=`cat ${TMPFILE} | awk '$1 ~ "VIDEO:" { print $2}'`
export vbps=`cat ${TMPFILE} | awk '$1 ~ "VIDEO:" { for (i=1;i<NF;i++) if ($i ~
"kbps" ) printf("%6.0f", $(i-1))}'`
export size=`cat ${TMPFILE} | awk '$4 ~ "size:" { print $4}'`
export hsize=`echo $size | awk -F: '{split($2,parts,"x");print parts[1]}'`
export vsize=`echo $size | awk -F: '{split($2,parts,"x");print parts[2]}'`
export atype=`cat ${TMPFILE} | awk '$1 ~ "Selected" && $2 ~ "audio" { print $6
}'`
export abitrate=`cat ${TMPFILE} | awk '$1 ~ "AUDIO:" { printf("%d",$7) }'`
export srate=`cat ${TMPFILE} | awk '$1 ~ "AUDIO:" { print $2 }'`
#if [ "$vtype" == "[XVID]" ] || [ "$vtype" == "[DX50]" ] ; then
#
# in both cases there is no separate "audio" to get the bit rate of
#
# export atype=$vtype
# export abitrate=320
# line looks like this for [DX50]
# audiocodec: framecopy (format=55 chans=2 rate=48000 bits=0 B/s=16000 sample-1)
# export srate=`cat ${TMPFILE} | awk '$1 ~ "audiocodec:" {
split($5,parts,"=");print parts[2] }'`
# echo "SRATE=${srate}"
#fi
echo " "
echo "ABITRATE = ${abitrate} TMPFILE is ${TMPFILE}"
echo " "
#cat ${TMPFILE}
if [ ${srate} -lt 22050 ] ; then
# certain audio rates seem to fail.
# ie 12000 fails either with VLC or transcoded, so set
# a lower limit. Lower limits may work, and/or only certain
# ones may not work - not enough testing has been done to determine
# which work and which fail.
export srate=22050
export abitrate=128
fi
if [ ${abitrate} -gt 320 ] ; then
#
# lame limits to 320
#
echo "abitrate is ${abitrate} limited to 320kbit/second"
export abitrate=320
elif [ ${abitrate} -lt 64 ] ; then
echo "abitrate is ${abitrate} limited to min of 224kbit/second"
export abitrate=64
fi
if [ -z "$vsize" ] || [ -z "$hsize" ] || [ -z "$atype" ] || [ -z "$vbps" ] ||
[ -z "$atype" ] || [ -z "$vtype" ] ; then
cat ${TMPFILE}
echo "ERROR: file $1 had a empty size or video or audio decoder - or "
echo " the information was parsed incorrectly"
echo "$size is $hsize x $vsize with vtype = $vtype at $vbps bps and atype
$atype with $crop"
exit -1
fi
export crop=`grep "Crop area" ${TMPFILE}* | awk -v hsize=${hsize} -v
vsize=${vsize} 'BEGIN { cropminx=hsize;cropminy=vsize;cropmaxx=0;cropmaxy=0}
{for (i=1;i<NF;i++) { if ($i ~ "-vf") split($(i+1),crop,"[=:)]") ; if ( crop[1]
== "crop" ) { if ( crop[2] > cropmaxx ) cropmaxx=crop[2] ; if ( crop[3] >
cropmaxy ) cropmaxy=crop[3] ; if (crop[4] < cropminx ) cropminx=crop[4] ; if
(crop[5] < cropminy ) cropminy=crop[5]}}} END { if ((cropmaxx != 0) && (
cropmaxy != 0) ) then
printf("crop=%d:%d:%d:%d,",cropmaxx,cropmaxy,cropminx,cropminy)}'`
if [ $DEBUG == 1 ] ; then
#echo "START >>>>>>"
#cat ${TMPFILE}*
#echo "<<<<<<<END"
#grep -i CROP ${TMPFILE}*
echo "$size is $hsize x $vsize with vtype = $vtype at $vbps bps and atype
$atype with $crop"
fi
if [ ${vbps} -gt 20000 ] ; then
# ATSC is limited to about 20Mbps
export vbps=20000
fi
export abps=`expr ${vbps} \* 640 / ${hsize} \* 480 / ${vsize}`
if [ ${abps} -gt 5500 ] ; then
export abps=5500
fi
export mbps=`expr ${abps} \* 2`
echo "New Average bps = ${abps} Max bps = ${mbps}"
echo "Crop is: ${crop}"
echo "srate = ${srate} abitrate=${abitrate}"
rm ${TMPFILE}*
if [ $hsize == 1920 ] && [ $vsize == 1080 ] ; then
echo "1920x1080 convertion selected"
mencoder -of mpeg -mpegopts format=dvd -srate ${srate} -ofps 30000:1001 -oac
mp3lame -ovc lavc -vf ${crop}scale=-3:400,expand=640:480,harddup -lavcopts
vcodec=mpeg2video:keyint=18:vrc_buf_size=1835:vrc_maxrate=${mbps}:vbitrate=${abps}
-lameopts cbr:br=${abitrate}:preset=${abitrate} -audio-preload 0.0 ${1} -o
${1}.mpg
elif [ $hsize == 1280 ] && [ $vsize == 720 ] ; then
echo "1280x720 conversion selected"
mencoder -of mpeg -mpegopts format=dvd -srate ${srate} -ofps 30000:1001 -oac
mp3lame -ovc lavc -vf ${crop}scale=-3:400,expand=640:480,harddup -lavcopts
vcodec=mpeg2video:keyint=18:vrc_buf_size=1835:vrc_maxrate=${mbps}:vbitrate=${abps}
-lameopts cbr:br=${abitrate}:preset=${abitrate} -audio-preload 0.0 ${1} -o
${1}.mpg
elif ( ( [ $hsize == 704 ] && [ $vsize == 480 ] ) ||
( [ $hsize == 640 ] && [ $vsize == 480 ] ) ||
( [ $hsize == 720 ] && [ $vsize == 480 ] ) ) &&
( [ "$vtype" == "MPEG1" ] || [ "$vtype" == "MPEG2" ] ) ; then
if [ "$atype" != "(mp3lib" ] ; then
echo "Audio is $atype and will not work - just transcoding the audio"
mencoder -of mpeg -mpegopts format=dvd -srate ${srate} -ofps 30000:1001
-oac mp3lame -lameopts cbr:br=${abitrate}:preset=${abitrate} -ovc copy
-audio-preload 0.0 ${1} -o ${1}.mpg && mv -i ${1} ${1}.orig && mv ${1}.mpg ${1}
else
echo "This movie should play on the MVPMC"
fi
elif [ $hsize == 320 ] && [ $vsize == 240 ] && [ "$vtype" == "MPEG1" ] ; then
# plays as postage stamp size
# rescale to something that will play
echo "320x240 conversion selected"
abps=`expr ${abps} / 2`
mbps=`expr ${mbps} / 2`
mencoder -of mpeg -mpegopts format=dvd -srate ${srate} -ofps 30000:1001
-oac mp3lame -ovc lavc -vf ${crop}scale=320:240,harddup -lavcopts
vcodec=mpeg2video:acodec=mp3:keyint=18:vrc_buf_size=1835:vrc_maxrate=${mbps}:vbitrate=${abps}
-lameopts cbr:br=${abitrate}:preset=${abitrate} -audio-preload 0.0 ${1} -o
${1}.mpg
elif [ $vbps -gt 10000 ] ; then
echo "This file has a bit rate of $vbps and is to high to play on MVPMC"
exit 0
elif [ "$vtype" != "MPEG1" ] && [ "$vtype" != "MPEG2" ] ; then
echo "This file is not MPEG1 or MPEG2 - transcoding"
echo " mencoder -of mpeg -mpegopts format=dvd -srate ${srate} -ofps 30000:1001
-oac mp3lame -ovc lavc -vf ${crop}scale=-3:400,expand=640:476,harddup -lavcopts
vcodec=mpeg2video:keyint=18:vrc_buf_size=1835:vrc_maxrate=${mbps}:vbitrate=${abps}
-lameopts cbr:br=${abitrate}:preset=${abitrate} -audio-preload 0.0 ${1} -o
${1}.mpg "
mencoder -of mpeg -mpegopts format=dvd -srate ${srate} -ofps 30000:1001 -oac
mp3lame -ovc lavc -vf ${crop}scale=-3:400,expand=640:476,harddup -lavcopts
vcodec=mpeg2video:keyint=18:vrc_buf_size=1835:vrc_maxrate=${mbps}:vbitrate=${abps}
-lameopts cbr:br=${abitrate}:preset=${abitrate} -audio-preload 0.0 ${1} -o
${1}.mpg
exit 0
elif [ "$atype" != "(mp3lib" ] ; then
#
# there is probably an audio bps limit - I have not yet seen a failure around
it so won't
# worry about the audio bps at this time
#
echo "This file does not use mp3lib audio and will not play correctly on
audio on MVPMC (ac3 will play but be out of sync)"
exit 0
elif ( [ $hsize == 352 ] && [ $vsize == 240 ] ) ||
( [ $hsize == 480 ] && [ $vsize == 480 ] ) ||
( [ $hsize == 720 ] && [ $vsize == 480 ] ) ; then
echo "This video file is believed to work on MVPMC correctly - no changes
needed"
exit 0
else
echo "Unknown MPEG1/MPEG2 with mp3 audio $hsize x $vsize it may or may not
play correctly"
exit 0
fi
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