The script below, though primitive, demonstrates use of mencoder (free
open source) for encoding high quality videos with compatibility with
existing android hardware.
Hopefully this will help anyone having troubles encoding....
#!/bin/bash
# filename=andvidenc
#USAGE:
# andvidenc low "input.video"
# andvidenc high "input.video"
#
# --output: "input.video.mp4"
#
# Note 1: if input video is INTERLACED, add "kerndeint" to -vf,
# i.e. ... -vf kerndeint,dsize....
#
# Note 2: if 2-pass encoding is not desired, comment out the FIRST
mencoder line
# from each case and remove "-passlogfile "$2.log"" and ":pass=2" from
remaining
# mencoder lines.
#
# Note 3: for testing purposes, I have verified that HTC dream is able
to play high
# bitrate files without trouble. Tested with bitrate up to 1024.
Visual difference
# between 512 and 1024 is minimal. Up to you to choose a bitrate that
balances
# quality with size.
# yes, this script is really stupid and has a lot of room for
enhancement. Feel free
# to improve it.
#EITHER:
if [ $1 = "low" ]; then
mencoder "$2" -o "$2.tmp.mp4" -vf dsize=480:352:2,scale=-8:-8,harddup
-oac faac -faacopts mpeg=4:object=2:raw:br=128 -of lavf -lavfopts
format=mp4 -ovc x264 -passlogfile "$2.log" -x264encopts
nocabac:level_idc=30:bframes=0:bitrate=512:threads=auto:turbo=1:pass=1
mencoder "$2" -o "$2.tmp.mp4" -vf dsize=480:352:2,scale=-8:-8,harddup
-oac faac -faacopts mpeg=4:object=2:raw:br=128 -of lavf -lavfopts
format=mp4 -ovc x264 -passlogfile "$2.log" -x264encopts
nocabac:level_idc=30:bframes=0:bitrate=512:threads=auto:pass=2
#OR:
else
mencoder "$2" -o "$2.tmp.mp4" -vf dsize=480:352:2,scale=-8:-8,harddup
-oac faac -faacopts mpeg=4:object=2:raw:br=128 -of lavf -lavfopts
format=mp4 -ovc x264 -passlogfile "$2.log" -sws 9 -x264encopts
nocabac:level_idc=30:bframes=0:bitrate=512:threads=auto:turbo=1:pass=1:global_header:threads=auto:subq=5:frameref=6:partitions=all:trellis=1:chroma_me:me=umh
mencoder "$2" -o "$2.tmp.mp4" -vf dsize=480:352:2,scale=-8:-8,harddup
-oac faac -faacopts mpeg=4:object=2:raw:br=128 -of lavf -lavfopts
format=mp4 -ovc x264 -passlogfile "$2.log" -sws 9 -x264encopts
nocabac:level_idc=30:bframes=0:bitrate=512:threads=auto:pass=2:global_header:subq=5:frameref=6:partitions=all:trellis=1:chroma_me:me=umh
fi
#THEN:
ffmpeg -i "$2.tmp.mp4" -vcodec copy -acodec copy "$2.mp4"
rm -f "$2.tmp.mp4" "$2.log"
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