[MEncoder-users] h264 (and help with encoding) or divx

[Alex Samad]

On Wed, Mar 05, 2008 at 07:14:29PM -0600, Brian Penick wrote:
> I suggest changing b_pyramid to nob_pyramid, subq=7 to subq=6 (you shouldn't
> notice a drop in quality at all but it will speed up the encode), and
> frameref=4 to frameref=2.  Optionally you could increase the b_bias to 20
> (b_bias=20) to favor bframes a little more since b_adapt still strongly
> favors P frames even when the image is totally still.  But I'm pretty sure
> your biggest issue here is the b_pyramid option.
Hi

Is there a simple way of explaing why this option is giving me the
blockiness.  The mn pages in mencoder only talk about referencing
B-Frames

Thanks

> 
> On Tue, Mar 4, 2008 at 6:36 PM, Alex Samad <alex at samad.com.au> wrote:
> 
> > Hi
> >
> > I am in the process of processing my video camera footage I have taken.
> >
> > I was hoping to go to h264, but testing the resultant files on my xbox
> > (xbmc), it is very choppy, it can't seem to keep up (also encoding sound
> > to aac).  So I am thinking to either go back to encoding with divx or
> > buy an xbox360 ?
> >
> > I would like to stay with h264 it saves a lot of space.
> >
> > My other problem with x264 is I get boxy area's when the back ground is
> > a wall, with a visible light gradient (you can see it get darker the
> > further away it is).  This looks okay in the original format, but when
> > encoded with x264 it goes all blocky and not smooth at all
> >
> > these are the flags I am using
> >
> >  H264COMMON=":frameref=4:mixed_refs:bframes=16:b_adapt:b_pyramid:weight_b:bime:direct_pred=auto:me=umh:me_range=24:subq=7:brdo:chroma_me:trellis=1:cabac:deblock:8x8dct:partitions=p8x8,b8x8,i8x8,i4x4:nofast_pskip:nodct_decimate:threads=auto:keyint=250:qp_min=10:qp_max=51:ip_factor=
> > 1.4:pb_factor=1.3:qcomp=0.6:qblur=0.5:chroma_qp_offset=0"
> >
> >    ENC1="x264 -x264encopts pass=1:crf=18:turbo$H264COMMON"
> >    ENC2="x264 -x264encopts pass=3:bitrate=$BITRATE$H264COMMON"
> >
> >    AENC="-af volnorm=1"
> >
> >    FILTER1=""
> >
> >    FILTER2="-vf spp,hqdn3d=2:1:2"
> >
> >   AUDIO="-oac faac -faacopts object=1:tns:quality=300:mpeg=4"
> >
> >    ASPECT="-aspect 16:9"
> >
> >    ADDOPT=
> >
> >
> >    echo "Video Pass 1/3"
> >        nice mencoder $QUIET \
> >            $ASPECT \
> >            -alang en\
> >            $FILTER1 \
> >            -ovc $ENC1 \
> >            -nosound \
> >            -passlogfile "$PASSLOG" \
> >            -o /dev/null \
> >            "$INFILE" $ADDOPT
> >
> >    echo "Video & Audio Pass 2/3"
> >    nice mencoder $QUIET \
> >            $ASPECT \
> >            -alang en\
> >            $FILTER2 \
> >            $AENC \
> >            -ovc $ENC2 \
> >            -passlogfile "$PASSLOG" \
> >            $AUDIO \
> >            -o "$AVIFILE" \
> >            "$INFILE" $ADDOPT
> >
> >    echo "Video & Audio Pass 3/3"
> >    nice mencoder $QUIET \
> >            $ASPECT \
> >            -alang en\
> >            $FILTER2 \
> >            $AENC \
> >            -ovc $ENC2 \
> >            -passlogfile "$PASSLOG" \
> >            $AUDIO \
> >            -o "$AVIFILE" \
> >            "$INFILE" $ADDOPT
> >
> >
> >    echo "Extract Video"
> >    nice MP4Box -aviraw video "$AVIFILE" > "$WRKDIR/aviraw_video.out" &
> >    WAITPD="$!"
> >
> >    # Extracts to ${BFILE}_audio.raw
> >    echo "Extract Audio"
> >    nice MP4Box -aviraw audio "$AVIFILE" > "$WRKDIR/aviraw_audio.out" &
> >    WAITPD="$WAITPD $!"
> >
> >    wait $WAITPD
> >
> >    mv $SNDFILERAW $SNDFILEAAC
> >
> >    echo "Make mp4"
> >    MP4Box -add "$VIDFILERAW" -add "$SNDFILEAAC" -fps 25 -new
> > "${OUTFILE}" > "$WRKDIR/MP4Box.out"
> >
> >
> >
> > What can I do to smooth out these ares with out loosing too much
> > definition in the for ground.
> >
> > Also how can I use mplayer (or mencoder) to output to a jpg a specific
> > frame (or time reference) so I can give examples
> >
> > Thanks
> >
> >
> > -
> > "The march to war affected the people's confidence. It's hard to make
> > investment. See, if you're a small business owner or a large business owner
> > and you're thinking about investing, you've got to be optimistic when you
> > invest. Except when you're marching to war, it's not a very optimistic
> > thought, is it? In other words, it's the opposite of optimistic when you're
> > thinking you're going to war."
> >
> >        - George W. Bush
> > 02/09/2004
> > Springfield, MO
> >
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> >
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> >
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> >
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-- 
Chemist who falls in acid is absorbed in work.
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