[mdlug] Script for encoding random video files for the Droid

[Ingles, Raymond]

 This script uses mencoder to re-encode video into H264 at 1000
kbits/sec for the Droid. It assumes the original video has a resolution
less than 854x480. If the video is larger, some scaling will need to be
done.

 Sincerely,

 Ray Ingles                                            (313) 227-2317

 "Science is what we understand well enough to explain to a computer.
          Art is everything else we do." - Donald Knuth

------------------------------------

#!/bin/bash
# Helps handling filenames with spaces
IFS=`printf '\n\t'`

## Set up parameters for encoding

# Where to put temporary files.
TEMP_FILE_DIR=`mktemp -d`

# This is the key parameter we gotta have from the user.
# Spaces in the output file name are probably not a good idea.
if [ -n "$1" ]; then
  NEWNAME=$1
else
  echo Output file name not specified, aborting!
  echo "Usage: " $0 " output-name [input video]"
  exit 0
fi

### Re-encode the video to H264 ###

# Two-pass encoding. Takes longer, but makes a noticeable improvement in
image
# quality for a given bitrate. More passes are possible, but hit the
point of
# diminishing returns very quickly, IMO.
nice -n 10 /usr/bin/mencoder $2 \
-o /dev/null -passlogfile ${TEMP_FILE_DIR}/pass.log -vf softskip,harddup
-sws 10 -channels 2 -oac faac -faacopts mpeg=4:object=2:br=128 -ovc x264
-x264encopts
pass=1:bitrate=1000:turbo=2:me=umh:me_range=16:dct_decimate:nointerlaced
:no8x8dct:nofast_pskip:trellis=0:partitions=p8x8,i4x4:mixed_refs:keyint=
240:keyint_min=24:psy_rd=0.8,0.0:frameref=1:bframes=0:b_adapt=0:noweight
_b:direct_pred=none:subq=8:chroma_me:nocabac:aq_mode=1:deblock:vbv_maxra
te=1500:vbv_bufsize=1000:level_idc=30:threads=auto:ssim:psnr

nice -n 10 /usr/bin/mencoder $2 \
-o ${TEMP_FILE_DIR}/${NEWNAME}.avi -passlogfile
${TEMP_FILE_DIR}/pass.log -vf softskip,harddup -sws 10 -af
volnorm,lavcresample=48000:16:1 -srate 48000 -channels 2 -oac faac
-faacopts mpeg=4:object=2:br=128 -ovc x264 -x264encopts
pass=2:bitrate=1000:me=umh:me_range=16:dct_decimate:nointerlaced:no8x8dc
t:nofast_pskip:trellis=0:partitions=p8x8,i4x4:mixed_refs:keyint=240:keyi
nt_min=24:psy_rd=0.8,0.0:frameref=1:bframes=0:b_adapt=0:noweight_b:direc
t_pred=none:subq=8:chroma_me:nocabac:aq_mode=1:deblock:vbv_maxrate=1500:
vbv_bufsize=1000:level_idc=30:threads=auto:ssim:psnr

### Repackage the video and audio into an MP4 container. ###

# Extract the video and audio from the .avi produced above.
/usr/bin/mencoder ${TEMP_FILE_DIR}/${NEWNAME}.avi -nosound -ovc copy -of
rawvideo -o ${TEMP_FILE_DIR}/h264_video.h264
/usr/bin/MP4Box -aviraw audio ${TEMP_FILE_DIR}/${NEWNAME}.avi -out
${TEMP_FILE_DIR}/aac.raw
mv -f ${TEMP_FILE_DIR}/aac_audio.raw ${TEMP_FILE_DIR}/aac_audio.aac

# Bundle it up into an MP4
/usr/bin/mplayer ${TEMP_FILE_DIR}/${NEWNAME}.avi -noconfig all -loop 1
-identify -nosound -vo null -nocache -frames 1 2>/dev/null | grep
'^ID_VIDEO_FPS' | tail -n 1 | awk -F= '{print $2}' >
${TEMP_FILE_DIR}/mp4fps
/usr/bin/MP4Box -fps $(cat ${TEMP_FILE_DIR}/mp4fps) -tmp
${TEMP_FILE_DIR} -add ${TEMP_FILE_DIR}/h264_video.h264  -add
${TEMP_FILE_DIR}/aac_audio.aac#audio:name="LC-AAC Stereo"   -itags
name="new_droid":comment="Tagged on $(date)"   -ipod -mpeg4 -new
"${NEWNAME}.mp4"

# Clean up after ourselves.
rm -rf ${TEMP_FILE_DIR}

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